@article{RoethNowackBaumeister2006, author = {R{\"o}th, Thilo and Nowack, N. and Baumeister, E.}, title = {Numerische L{\"o}sungsans{\"a}tze zur Auslegung von Stahl-Leichtmetall-Hybriden aus Verbundguss f{\"u}r zuk{\"u}nftige Fahrzeugstrukturen / Nowack, N. ; R{\"o}th, T. ; Baumeister, E.}, series = {Berechnung und Simulation im Fahrzeugbau. Bd. 1 : Tagung W{\"u}rzburg, 27. und 28. September 2006 = Numerical analysis and simulation in vehicle engineering / VDI-Gesellschaft Fahrzeug- und Verkehrstechnik}, journal = {Berechnung und Simulation im Fahrzeugbau. Bd. 1 : Tagung W{\"u}rzburg, 27. und 28. September 2006 = Numerical analysis and simulation in vehicle engineering / VDI-Gesellschaft Fahrzeug- und Verkehrstechnik}, publisher = {VDI-Verl.}, address = {D{\"u}sseldorf}, isbn = {3-18-091967-1}, pages = {363 -- 368}, year = {2006}, language = {de} } @book{EschAppelHoepke2008, author = {Esch, Thomas and Appel, Wolfgang and H{\"o}pke, Friedrich}, title = {Nutzfahrzeugtechnik : Grundlagen, Systeme, Komponenten ; mit 35 Tabellen / Appel, Wolfgang ; H{\"o}pke, Friedrich ... Esch, Thomas [u.a.] 5., vollst. {\"u}berarb. Aufl.}, publisher = {Vieweg + Teubner}, address = {Wiesbaden}, isbn = {978-3-8348-0374-0}, pages = {XXVIII, 509 S. : zahlr. Ill. und graph. Darst.}, year = {2008}, language = {de} } @article{Wittmann2000, author = {Wittmann, Klaus}, title = {Overview of Space Operations at DLR}, year = {2000}, language = {en} } @article{Mertens1998, author = {Mertens, Josef}, title = {Aerodynamische Ziele des Adaptiven Fl{\"u}gels (ADIF).}, series = {DGLR-Jahrbuch 1998 Bd. 1}, journal = {DGLR-Jahrbuch 1998 Bd. 1}, pages = {47 -- 52}, year = {1998}, language = {de} } @article{MertensHuenecke1988, author = {Mertens, Josef and H{\"u}necke, Klaus}, title = {Experimentelle Untersuchung zur Landeeigenschaft von Hyperschall-Flugger{\"a}ten / H{\"u}necke, Klaus ; Mertens, Josef}, series = {DGLR-Jahrbuch 1988 Bd. 1}, journal = {DGLR-Jahrbuch 1988 Bd. 1}, pages = {706}, year = {1988}, language = {de} } @article{MertensKelmVelden1999, author = {Mertens, Josef and Kelm, R. and Velden, A. van der}, title = {Interdisziplin{\"a}re Auslegung eines Verkehrsflugzeugfl{\"u}gels}, series = {DGLR-Jahrbuch 1999 Bd. 3}, journal = {DGLR-Jahrbuch 1999 Bd. 3}, pages = {1605 -- 1610}, year = {1999}, language = {de} } @article{Mertens1999, author = {Mertens, Josef}, title = {Einige herausragende Ergebnisse des Technologieprogramms "Reduktion des Aerodynamischen Widerstands (RaWid)"}, series = {DGLR-Jahrbuch 1999 Bd. 3}, journal = {DGLR-Jahrbuch 1999 Bd. 3}, pages = {1461 -- 1468}, year = {1999}, language = {de} } @book{Mertens1999, author = {Mertens, Josef}, title = {Reduktion des aerodynamischen Widerstands (RaWid) : Abschlußbericht ; Laufzeit des Vorhaben, Berichtszeitraum: 01.07.1995 bis 31.12.1998 / Verf.: J. Mertens}, publisher = {DaimlerChrysler Aerospare Airbus GmbH}, address = {Hamburg}, pages = {31 Bl. : Ill., graph. Darst.}, year = {1999}, language = {de} } @book{Mertens1999, author = {Mertens, Josef}, title = {Reduktion des aerodynamischen Widerstands (RaWid) : Abschlußbericht ; Laufzeit des Vorhaben, Berichtszeitraum: 01.07.1995 bis 31.12.1998 / Verf.: J. Mertens}, publisher = {DaimlerChrysler Aerospare Airbus GmbH}, address = {Hamburg}, pages = {Elektronische Ressource 31 p. = 1,38 Mb. text and}, year = {1999}, language = {de} } @book{Esch2006, author = {Esch, Thomas}, title = {Dynamik der Fahrzeuge : L{\"a}ngsdynamik. - 5. Aufl., [Umdruck]. - (Angewandte Thermodynamik und Verbrennungstechnik)}, publisher = {Fachhochschule Aachen, Lehr- und Forschungsgebiet Thermodynamik und Verbrennungstechnik}, address = {Aachen}, pages = {Getr. Z{\"a}hlung : zahlr. graph. Darst.}, year = {2006}, language = {de} } @book{Esch2006, author = {Esch, Thomas}, title = {Experimentelle Untersuchungen an Verbrennungsmotoren. - 8. Aufl., [Umdruck]. - (Angewandte Thermodynamik und Verbrennungstechnik)}, publisher = {Fachhochschule Aachen, Lehr- und Forschungsgebiet Thermodynamik und Verbrennungstechnik}, address = {Aachen}, pages = {Getr. Z{\"a}hlung : zahlr. Ill. und graph. Darst.}, year = {2006}, language = {de} } @book{Esch2007, author = {Esch, Thomas}, title = {Verbrennungstechnik. - 6. Aufl., [Umdruck]. - (Angewandte Thermodynamik und Verbrennungstechnik)}, publisher = {Fachhochschule Aachen, Lehr- und Forschungsgebiet Thermodynamik und Verbrennungstechnik}, address = {Aachen}, pages = {Getr. Z{\"a}hlung : Ill. und graph. Darst.}, year = {2007}, language = {de} } @article{Mertens1992, author = {Mertens, Josef}, title = {Laminar flow for supersonic transports}, series = {Proceedings : March 16 - 18, 1992, Congress Centrum, Hamburg, Federal Republic of Germany / organized jointly by: Deutsche Gesellschaft f{\"u}r Luft- und Raumfahrt e.V. ... [Programme committee J. Szodruch ...]}, journal = {Proceedings : March 16 - 18, 1992, Congress Centrum, Hamburg, Federal Republic of Germany / organized jointly by: Deutsche Gesellschaft f{\"u}r Luft- und Raumfahrt e.V. ... [Programme committee J. Szodruch ...]}, publisher = {DGLR}, address = {Bonn}, isbn = {3-922010-73-3}, pages = {319 -- 323}, year = {1992}, language = {en} } @book{Funke2001, author = {Funke, Harald}, title = {Analyse der Temperatur- und Str{\"o}mungsungleichf{\"o}rmigkeiten in mehrstufigen Turbinen / Harald Funke}, publisher = {Mainz}, address = {Aachen}, isbn = {3-89653-400-9}, pages = {VI, 135 S. : Ill., graph. Darst.}, year = {2001}, language = {de} } @article{BohnFunke2003, author = {Bohn, Dieter and Funke, Harald}, title = {Experimental investigations into the nonuniform flow in a 4-stage turbine with special focus on the flow equalization in the first turbine stage}, series = {ASME TURBO EXPO, Proceedings of the ASME Turbo Expo, 2003}, journal = {ASME TURBO EXPO, Proceedings of the ASME Turbo Expo, 2003}, isbn = {0-7918-3689-4}, pages = {281 -- 289}, year = {2003}, language = {en} } @article{Gerhardt2005, author = {Gerhardt, Hans Joachim}, title = {Design methods of smoke and heat exhaust systems in construction works}, series = {V Mie\&\#796;dzynarodowa Konferencja Bezpiecze\&\#324;stwo Po\&\#380;arowe Budowli, Warszawa-Miedzeszyn, 14 - 16 listopada 2005 r. = : Vth International Conference Fire Safety of Buildings / ITB ... [Ed. Miros\&\#322;aw Kosiorek]}, journal = {V Mie\&\#796;dzynarodowa Konferencja Bezpiecze\&\#324;stwo Po\&\#380;arowe Budowli, Warszawa-Miedzeszyn, 14 - 16 listopada 2005 r. = : Vth International Conference Fire Safety of Buildings / ITB ... [Ed. Miros\&\#322;aw Kosiorek]}, publisher = {ITB}, address = {Warszawa}, isbn = {83-7413-810-6}, pages = {127 -- 140}, year = {2005}, language = {en} } @article{GerhardtSchoenwaldForssmannetal.2005, author = {Gerhardt, Hans Joachim and Sch{\"o}nwald, J. and Forßmann, R. and Große, Wolfgang}, title = {Modulation der Windenergie durch optimierte Uferbepflanzung zur Steuerung der Oberfl{\"a}chenstr{\"o}mung f{\"u}r das Entfernung von Treibgut}, series = {Der F{\"u}hlinger See : Beitr{\"a}ge zur Erhaltung der {\"o}kologischen Qualit{\"a}t / hrsg. von Wolfgang Große ... - ({\"O}kologie und nachhaltige Entwicklung von Sport- und Freizeitseen ; 1)}, journal = {Der F{\"u}hlinger See : Beitr{\"a}ge zur Erhaltung der {\"o}kologischen Qualit{\"a}t / hrsg. von Wolfgang Große ... - ({\"O}kologie und nachhaltige Entwicklung von Sport- und Freizeitseen ; 1)}, publisher = {Monsenstein und Vannerdat}, address = {M{\"u}nster}, isbn = {3-86582-212-6}, pages = {95 -- 108}, year = {2005}, language = {de} } @article{Gerhardt2006, author = {Gerhardt, Hans Joachim}, title = {Wind- und Temperatureinfl{\"u}sse bei der Planung von Entrauchungseinrichtungen}, series = {VFDB-Zeitschrift : Forschung, Technik und Management im Brandschutz. 55 (2006), H. 3}, journal = {VFDB-Zeitschrift : Forschung, Technik und Management im Brandschutz. 55 (2006), H. 3}, isbn = {0042-1804}, pages = {115 -- 121}, year = {2006}, language = {de} } @article{GerhardtKonrathStiel2006, author = {Gerhardt, Hans Joachim and Konrath, B. and Stiel, M.}, title = {Anmerkungen zur DIN EN 12101-2 {\"u}ber die Pr{\"u}fung von nat{\"u}rlichen Rauch- und W{\"a}rmeabzugsanlagen (NRGW)}, series = {VFDB-Zeitschrift : Forschung, Technik und Management im Brandschutz. 55 (2006), H. 3}, journal = {VFDB-Zeitschrift : Forschung, Technik und Management im Brandschutz. 55 (2006), H. 3}, isbn = {0042-1804}, pages = {157 -- 158}, year = {2006}, language = {de} } @article{GerhardtSchoenwaldKonrath2007, author = {Gerhardt, Hans Joachim and Sch{\"o}nwald, J. and Konrath, B.}, title = {Verwendung von Leichtgas bei Brandsimulationen - unzul{\"a}ssig oder sinnvoll?}, series = {VFDB-Zeitschrift : Forschung, Technik und Management im Brandschutz. 56 (2007), H. 1}, journal = {VFDB-Zeitschrift : Forschung, Technik und Management im Brandschutz. 56 (2007), H. 1}, isbn = {0042-1804}, pages = {29 -- 31}, year = {2007}, language = {de} } @article{GerhardtKonrathSchoenwald2005, author = {Gerhardt, Hans Joachim and Konrath, B. and Sch{\"o}nwald, J.}, title = {Brandsimulation f{\"u}r Abnahmeversuche}, series = {HLH : L{\"u}ftung, Klima, Heizung, Sanit{\"a}r, Geb{\"a}udetechnik. 56 (2005), H. 8}, journal = {HLH : L{\"u}ftung, Klima, Heizung, Sanit{\"a}r, Geb{\"a}udetechnik. 56 (2005), H. 8}, isbn = {1436-5103}, pages = {46 -- 51}, year = {2005}, language = {de} } @article{GerhardtKonrathLieb2005, author = {Gerhardt, Hans Joachim and Konrath, B. and Lieb, R.-D.}, title = {Das Drallrohr}, series = {HLH : L{\"u}ftung, Klima, Heizung, Sanit{\"a}r, Geb{\"a}udetechnik. 56 (2005), H. 11}, journal = {HLH : L{\"u}ftung, Klima, Heizung, Sanit{\"a}r, Geb{\"a}udetechnik. 56 (2005), H. 11}, isbn = {1436-5103}, pages = {91 -- 95}, year = {2005}, language = {en} } @article{GerhardtKrueger1997, author = {Gerhardt, Hans Joachim and Kr{\"u}ger, O.}, title = {Building shape influence on local wind loads}, series = {Proceedings of the 2nd European \& African Conference on Wind Engineering : 2 EACWE, Palazzo Ducale, Genova, Italy, June 22-26, 1997 / ed. by Giovanni Solari. - Vol. 2}, journal = {Proceedings of the 2nd European \& African Conference on Wind Engineering : 2 EACWE, Palazzo Ducale, Genova, Italy, June 22-26, 1997 / ed. by Giovanni Solari. - Vol. 2}, publisher = {Servizi Grafici Editoriali}, address = {Padova}, isbn = {88-86281-19-6}, pages = {XIX, S. 1017 - 1998 : Ill., graph. Darst.}, year = {1997}, language = {en} } @article{Gerhardt2005, author = {Gerhardt, Hans Joachim}, title = {Teures Bauen durch starre Genehmigungspraxis}, series = {Der Bausachverst{\"a}ndige : Zeitschrift f{\"u}r Bausch{\"a}den, Grundst{\"u}ckswert und gutachterliche T{\"a}tigkeit. 1 (2005), H. 5}, journal = {Der Bausachverst{\"a}ndige : Zeitschrift f{\"u}r Bausch{\"a}den, Grundst{\"u}ckswert und gutachterliche T{\"a}tigkeit. 1 (2005), H. 5}, isbn = {1614-6123}, pages = {44 -- 45}, year = {2005}, language = {de} } @article{GerhardtLieb2005, author = {Gerhardt, Hans Joachim and Lieb, R.-D.}, title = {Entrauchung komplexer R{\"a}umlichkeiten : Strategien und Steuerungen}, series = {T{\"u}r-Tor-Fenster-Report : Fachzeitschrift f{\"u}r die Technologien von T{\"u}ren, Toren und Fenstern. 25 (2005), H. 3}, journal = {T{\"u}r-Tor-Fenster-Report : Fachzeitschrift f{\"u}r die Technologien von T{\"u}ren, Toren und Fenstern. 25 (2005), H. 3}, isbn = {0724-7702}, pages = {27 -- 29}, year = {2005}, language = {de} } @article{Gerhardt2005, author = {Gerhardt, Hans Joachim}, title = {Physikalische Modelle f{\"u}r Brandsicherheitsnachweise = physical models for fire safety design}, series = {Kurzreferate : Hannover, 6. und 7. Juni 2005 = Proceedings / [Veranst.: VFDB, Vereinigung zur F{\"o}rderung des Deutschen Brandschutzes e.V.; iBMB, Institut f{\"u}r Baustoffe, Massivbau und Brandschutz der Technischen Universit{\"a}t Braunschweig]. Hrsg.: Dietmar Hosser}, journal = {Kurzreferate : Hannover, 6. und 7. Juni 2005 = Proceedings / [Veranst.: VFDB, Vereinigung zur F{\"o}rderung des Deutschen Brandschutzes e.V.; iBMB, Institut f{\"u}r Baustoffe, Massivbau und Brandschutz der Technischen Universit{\"a}t Braunschweig]. Hrsg.: Dietmar Hosser}, publisher = {iBMB}, address = {Braunschweig}, isbn = {3-89288-165-0}, pages = {135 -- 154}, year = {2005}, language = {de} } @inproceedings{RoethStark2009, author = {R{\"o}th, Thilo and Stark, R.}, title = {Die Rolle der virtuellen Produktentstehung bei der Integration von Karosseriesystemen}, series = {Karosseriekongress Systemintegration in der Karosserietechnik : 17. und 18. M{\"a}rz 2009 in Baden-Baden / Kongressleitung: Reiner Stark}, booktitle = {Karosseriekongress Systemintegration in der Karosserietechnik : 17. und 18. M{\"a}rz 2009 in Baden-Baden / Kongressleitung: Reiner Stark}, publisher = {VDI-Wissensforum}, address = {D{\"u}sseldorf}, isbn = {978-3-9812624-4-5}, pages = {175 S. : zahlr. Ill., graph. Darst.}, year = {2009}, language = {de} } @incollection{FunkeBoernerHendricketal.2011, author = {Funke, Harald and B{\"o}rner, Sebastian and Hendrick, P. and Recker, E.}, title = {Modification and testing of an engine and fuel control system for a hydrogen fuelled gas turbine}, series = {Progress in Propulsion Physics. Vol. 2}, booktitle = {Progress in Propulsion Physics. Vol. 2}, publisher = {EDP Sciences}, address = {Les Ulis}, isbn = {978-2-7598-0673-7}, pages = {475 -- 486}, year = {2011}, language = {en} } @book{AppelBraehlerDahlhausetal.2010, author = {Appel, Wolfgang and Br{\"a}hler, Hermann and Dahlhaus, Ulrich and Esch, Thomas and Kopp, Stephan and Rhein, Bernd}, title = {Nutzfahrzeugtechnik : Grundlagen, Systeme, Komponenten. 6., {\"u}berarb. Aufl.}, publisher = {Vieweg + Teubner}, address = {Wiesbaden}, isbn = {978-3-8348-9757-2}, pages = {XXVIII, 509 S. : Ill., graph. Darst.}, year = {2010}, language = {de} } @book{AppelBraehlerBreueretal.2013, author = {Appel, Wolfgang and Br{\"a}hler, Hermann and Breuer, Stefan and Dahlhaus, Ulrich and Esch, Thomas and Hoepke, Erich and Kopp, Stephan and Rhein, Bernd}, title = {Nutzfahrzeugtechnik : Grundlagen, Systeme, Komponenten. 7., {\"u}berarb. u. erw. Aufl.}, publisher = {Vieweg + Teubner}, address = {Wiesbaden}, isbn = {978-3-8348-2224-6}, pages = {XXXII, 620 S. : Ill., graph. Darst.}, year = {2013}, language = {de} } @book{Esch2007, author = {Esch, Thomas}, title = {Experimentelle Untersuchungen an Antriebssystemen von Kraft-, Luft- und Raumfahrzeugen : Vorlesungsumdruck. Bd. 1}, publisher = {Fachhochschule Aachen, Lehr- und Forschungsgebiet Thermodynamik und Verbrennungstechnik}, address = {Aachen}, pages = {Getr. Z{\"a}hlung : zahlr. Ill. und graph. Darst.}, year = {2007}, language = {de} } @book{Esch2007, author = {Esch, Thomas}, title = {Experimentelle Untersuchungen an Antriebssystemen von Kraft-, Luft- und Raumfahrzeugen : Vorlesungsumdruck. Bd. 2}, publisher = {Fachhochschule Aachen, Lehr- und Forschungsgebiet Thermodynamik und Verbrennungstechnik}, address = {Aachen}, pages = {Getr. Z{\"a}hlung : zahlr. Ill. und graph. Darst.}, year = {2007}, language = {de} } @book{Esch2012, author = {Esch, Thomas}, title = {Experimentelle Untersuchungen an Antriebssystemen von Kraft-, Luft- und Raumfahrzeugen : Vorlesungsumdruck. 2. Aufl. Bd. 2}, publisher = {Fachhochschule Aachen, Lehr- und Forschungsgebiet Thermodynamik und Verbrennungstechnik}, address = {Aachen}, pages = {Getr. Z{\"a}hlung : zahlr. Ill. und graph. Darst.}, year = {2012}, language = {de} } @book{Esch2008, author = {Esch, Thomas}, title = {Verbrennungstechnik : Vorlesungsumdruck. 7. Aufl.}, publisher = {Fachhochschule Aachen, Lehr- und Forschungsgebiet Thermodynamik und Verbrennungstechnik}, address = {Aachen}, pages = {Getr. Z{\"a}hlung : Ill. und graph. Darst.}, year = {2008}, language = {de} } @book{Esch2011, author = {Esch, Thomas}, title = {Verbrennungstechnik : Vorlesungsumdruck. 8. Aufl.}, publisher = {Fachhochschule Aachen, Lehr- und Forschungsgebiet Thermodynamik und Verbrennungstechnik}, address = {Aachen}, pages = {Getr. Z{\"a}hlung : Ill. und graph. Darst.}, year = {2011}, language = {de} } @book{Schmitz2013, author = {Schmitz, G{\"u}nter}, title = {Elektrotechnik f{\"u}r Ingenieurstudenten nichtelektrotechnischer Fachrichtungen. Hauptbd.: Gleichspannungstechnik, Wechselspannungstechnik, Elektrische Maschinen}, publisher = {Schmitz}, address = {Aachen}, isbn = {978-1-481830-60-7}, pages = {150 S. : Ill., graph. Darst.}, year = {2013}, language = {de} } @book{Schmitz2013, author = {Schmitz, G{\"u}nter}, title = {Elektrotechnik f{\"u}r Ingenieurstudenten nichtelektrotechnischer Fachrichtungen. Aufgabensammlung, [{\"U}bungs- und Klausuraufgaben]}, publisher = {Schmitz}, address = {Aachen}, isbn = {978-1-482721-47-8}, pages = {140 S. : graph. Darst.}, year = {2013}, language = {de} } @book{Esch2009, author = {Esch, Thomas}, title = {Raumfahrtantriebe. 7. Aufl., [Umdruck]}, publisher = {Fachhochschule Aachen, Lehr- und Forschungsgebiet Thermodynamik und Verbrennungstechnik}, address = {Aachen}, pages = {Getr. Z{\"a}hlung : Ill. und graph. Darst.}, year = {2009}, language = {de} } @inproceedings{SpohrSchirraHoeflingetal.2013, author = {Spohr, A. and Schirra, Julian and Hoefling, J. and Schedl, A.}, title = {Wing weight estimation methodology for highly non-planar lifting systems during conceptual design}, series = {Deutscher Luft- und Raumfahrtkongress 2013 : 10.9. - 12.9.2013, Stuttgart}, booktitle = {Deutscher Luft- und Raumfahrtkongress 2013 : 10.9. - 12.9.2013, Stuttgart}, organization = {Deutscher Luft- und Raumfahrtkongress <62, 2013, Stuttgart>}, pages = {Publ. online}, year = {2013}, language = {en} } @inproceedings{HoeflingSchirraSpohretal.2013, author = {Hoefling, J. and Schirra, Julian and Spohr, A. and Sch{\"a}fer, D.}, title = {Induced drag computation with wake model schemes for highly non-planar wing systems}, series = {Deutscher Luft- und Raumfahrtkongress 2013 : 10.9. - 12.9.2013, Stuttgart}, booktitle = {Deutscher Luft- und Raumfahrtkongress 2013 : 10.9. - 12.9.2013, Stuttgart}, publisher = {Dt. Ges. f{\"u}r Luft- und Raumfahrt}, address = {Bonn}, organization = {Deutscher Luft- und Raumfahrtkongress <62, 2013, Stuttgart>}, pages = {1 -- 10}, year = {2013}, language = {en} } @article{FunkeDickhoffKeinzetal.2014, author = {Funke, Harald and Dickhoff, J. and Keinz, Jan and Anis, H. A. and Parente, A. and Hendrick, P.}, title = {Experimental and numerical study of the micromix combustion principle applied for hydrogen and hydrogen-rich syngas as fuel with increased energy density for industrial gas turbine applications}, series = {Energy procedia}, journal = {Energy procedia}, number = {61}, publisher = {Elsevier}, address = {Amsterdam}, issn = {1876-6102 (E-Journal)}, doi = {10.1016/j.egypro.2014.12.201}, pages = {1736 -- 1739}, year = {2014}, abstract = {The Dry Low NOx (DLN) Micromix combustion principle with increased energy density is adapted for the industrial gas turbine APU GTCP 36-300 using hydrogen and hydrogen-rich syngas with a composition of 90\%-Vol. hydrogen (H₂) and 10\%-Vol. carbon-monoxide (CO). Experimental and numerical studies of several combustor geometries for hydrogen and syngas show the successful advance of the DLN Micromix combustion from pure hydrogen to hydrogen-rich syngas. The impact of the different fuel properties on the combustion principle and aerodynamic flame stabilization design laws, flow field, flame structure and emission characteristics is investigated by numerical analysis using a hybrid Eddy Break Up combustion model and validated against experimental results.}, language = {en} } @article{SchirraWatmuffBauschat2014, author = {Schirra, Julian and Watmuff, Jonathan and Bauschat, J.-Michael}, title = {Highly non-planar lifting systems: a relative assessment of existing potential-methodologies to accurately estimate the induced drag}, series = {32nd AIAA Applied Aerodynamics Conference 2014 : June, 16-20 2014, Atlanta, Ga.}, journal = {32nd AIAA Applied Aerodynamics Conference 2014 : June, 16-20 2014, Atlanta, Ga.}, organization = {American Institute of Aeronautics and Astronautics}, isbn = {978-1-62410-288-2}, doi = {10.2514/6.2014-2988}, pages = {Publ. online}, year = {2014}, language = {en} } @inproceedings{FunkeKeinzBoerneretal.2013, author = {Funke, Harald and Keinz, Jan and B{\"o}rner, Sebastian and Haj Ayed, A. and Kusterer, K. and Tekin, N. and Kazari, M. and Kitajima, J. and Horikawa, A. and Okada, K.}, title = {Experimental and numerical characterization of the dry low NOx micromix hydrogen combustion principle at increased energy density for industrial hydrogen gas turbine applications}, series = {Combustion, fuels and emissions : proceedings of the ASME Turbo Expo: Turbine Technical Conference and Exposition - 2013 ; June 3 - 7, 2013, San Antonio, Texas, USA ; vol. 1}, booktitle = {Combustion, fuels and emissions : proceedings of the ASME Turbo Expo: Turbine Technical Conference and Exposition - 2013 ; June 3 - 7, 2013, San Antonio, Texas, USA ; vol. 1}, editor = {Song, Seung Jin}, publisher = {ASME}, address = {New York, NY}, organization = {American Society of Mechanical Engineers}, isbn = {978-0-7918-5510-2}, pages = {V001T04A055}, year = {2013}, language = {en} } @inproceedings{SchirraJ2013, author = {Schirra, Julian and J., Watmuff}, title = {Euler-based induced drag estimation for highly non-planar lifting systems during conceptional design}, series = {62. Deutscher Luft- und Raumfahrtkongress 2013 : 10. - 12. September 2032, Stuttgart, Haus der Wirtschaft}, booktitle = {62. Deutscher Luft- und Raumfahrtkongress 2013 : 10. - 12. September 2032, Stuttgart, Haus der Wirtschaft}, publisher = {Dt. Gesellschaft f{\"u}r Luft- und Raumfahrt}, address = {Bonn}, organization = {Deutsche Gesellschaft f{\"u}r Luft- und Raumfahrt - Lilienthal-Oberth}, pages = {1 -- 8}, year = {2013}, language = {en} } @phdthesis{Boerner2013, author = {B{\"o}rner, Sebastian}, title = {Optimization and testing of a low NOx hydrogen fuelled gas turbine}, publisher = {Universit{\´e} Libre de Bruxelles}, address = {Bruxelles}, pages = {XVI, 144 S.}, year = {2013}, language = {en} } @inproceedings{FunkeKeinzKustereretal.2015, author = {Funke, Harald and Keinz, Jan and Kusterer, K. and Haj Ayed, A. and Kazari, M. and Kitajima, J. and Horikawa, A. and Okada, K.}, title = {Experimental and Numerical Study on Optimizing the DLN Micromix Hydrogen Combustion Principle for Industrial Gas Turbine Applications}, series = {ASME Turbo Expo 2015: Turbine Technical Conference and Exposition Volume 4A: Combustion, Fuels and Emissions Montreal, Quebec, Canada, June 15-19, 2015}, booktitle = {ASME Turbo Expo 2015: Turbine Technical Conference and Exposition Volume 4A: Combustion, Fuels and Emissions Montreal, Quebec, Canada, June 15-19, 2015}, isbn = {978-0-7918-5668-0}, doi = {10.1115/GT2015-42043}, pages = {V04AT04A008}, year = {2015}, language = {en} } @inproceedings{TheisKrisnamurthySchmitz2015, author = {Theis, Jochen and Krisnamurthy, Hemanth Kumar and Schmitz, G{\"u}nter}, title = {Modellbasierte Simulation und experimentelle Anwendung von mechatronischen Systemen in der Lehre in Verbindung mit NI myRIO und dem NI LabVIEW Interface Toolkit}, series = {Virtuelle Instrumente in der Praxis 2015 : Mess-, Steuer-, Regel- und Embedded-Systeme; Begleitband zum 20. VIP-Kongress}, booktitle = {Virtuelle Instrumente in der Praxis 2015 : Mess-, Steuer-, Regel- und Embedded-Systeme; Begleitband zum 20. VIP-Kongress}, editor = {Jamal, Rahman}, publisher = {VDE-Verl.}, address = {Berlin}, isbn = {978-3-8007-3669-0}, pages = {362 -- 365}, year = {2015}, language = {de} } @article{HajAyedKustererFunkeetal.2015, author = {Haj Ayed, A. and Kusterer, K. and Funke, Harald and Keinz, Jan and Striegan, Constantin and Bohn, D.}, title = {Experimental and numerical investigations of the dry-low-NOx hydrogen micromix combustion chamber of an industrial gas turbine}, series = {Propulsion and power research}, volume = {Vol. 4}, journal = {Propulsion and power research}, number = {Iss. 3}, issn = {2212-540X}, doi = {10.1016/j.jppr.2015.07.005}, pages = {123 -- 131}, year = {2015}, language = {en} } @article{HajAyedKustererFunkeetal.2015, author = {Haj Ayed, A. and Kusterer, K. and Funke, Harald and Keinz, Jan and Striegan, Constantin and Bohn, D.}, title = {Improvement study for the dry-low-NOx hydrogen micromix combustion technology}, series = {Propulsion and power research}, volume = {Vol. 4}, journal = {Propulsion and power research}, number = {Iss. 3}, issn = {2212-540X}, doi = {10.1016/j.jppr.2015.07.003}, pages = {132 -- 140}, year = {2015}, language = {en} } @inproceedings{NeuJanserKhatibietal.2015, author = {Neu, Eugen and Janser, Frank and Khatibi, Akbar A. and Orifici, Adrian C.}, title = {Operational modal analysis of a cantilever in a wind tunnel using optical fiber bragg grating sensors}, series = {6th International Operational Modal Analysis Conference. IOMAC´15. 2015 May 12-14 Gijon - Spain}, booktitle = {6th International Operational Modal Analysis Conference. IOMAC´15. 2015 May 12-14 Gijon - Spain}, doi = {10.13140/RG.2.1.3753.0324}, pages = {10 S.}, year = {2015}, language = {en} } @article{BindalSharmaJanseretal.2013, author = {Bindal, Gaurav and Sharma, Sparsh and Janser, Frank and Neu, Eugen}, title = {Detailed analysis of variables affecting wing kinematics of bat flight}, series = {SAE International Journal of Aerospace}, volume = {6}, journal = {SAE International Journal of Aerospace}, number = {2}, issn = {1946-3901}, doi = {10.4271/2013-01-9003}, pages = {811 -- 818}, year = {2013}, language = {en} } @article{SchuellerKowalskiRaback2016, author = {Sch{\"u}ller, K. and Kowalski, Julia and Raback, P.}, title = {Curvilinear melting - A preliminary experimental and numerical study}, series = {International Journal of Heat and Mass Transfer}, journal = {International Journal of Heat and Mass Transfer}, number = {92}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0017-9310}, doi = {10.1016/j.ijheatmasstransfer.2015.09.046}, pages = {884 -- 892}, year = {2016}, abstract = {When exploring glacier ice it is often necessary to take samples or implement sensors at a certain depth underneath the glacier surface. One way of doing this is by using heated melting probes. In their common form these devices experience a straight one-dimensional downwards motion and can be modeled by standard close-contact melting theory. A recently developed melting probe however, the IceMole, achieves maneuverability by simultaneously applying a surface temperature gradient to induce a change in melting direction and controlling the effective contact-force by means of an ice screw to stabilize its change in attitude. A modeling framework for forced curvilinear melting does not exist so far and will be the content of this paper. At first, we will extend the existing theory for quasi-stationary close-contact melting to curved trajectories. We do this by introducing a rotational mode. This additional unknown in the system implies yet the need for another model closure. Within this new framework we will focus on the effect of a variable contact-force as well as different surface temperature profiles. In order to solve for melting velocity and curvature of the melting path we present both an inverse solution strategy for the analytical model, and a more general finite element framework implemented into the open source software package ELMER. Model results are discussed and compared to experimental data conducted in laboratory tests.}, language = {de} } @book{Esch2015, author = {Esch, Thomas}, title = {Verbrennungsmotoren}, edition = {11. Aufl., [Umdruck]}, publisher = {Fachhochschule Aachen, Lehr- und Forschungsgebiet Thermodynamik und Verbrennungstechnik}, address = {Aachen}, pages = {Getr. Z{\"a}hlung : Ill. und graph. Darst.}, year = {2015}, language = {de} } @book{Esch2013, author = {Esch, Thomas}, title = {Verbrennungsmotoren}, edition = {10. Aufl., [Umdruck]}, publisher = {Fachhochschule Aachen, Lehr- und Forschungsgebiet Thermodynamik und Verbrennungstechnik}, address = {Aachen}, pages = {Getr. Z{\"a}hlung : Ill. und graph. Darst.}, year = {2013}, language = {de} } @book{Esch2015, author = {Esch, Thomas}, title = {Experimentelle Untersuchungen an Antriebssystemen von Kraft-, Luft- und Raumfahrzeugen : Vorlesungsumdruck. 3. Aufl. Bd. 1}, edition = {3. Aufl.}, publisher = {Fachhochschule Aachen, Lehr- und Forschungsgebiet Thermodynamik und Verbrennungstechnik}, address = {Aachen}, pages = {Getr. Z{\"a}hlung : Ill. und graph. Darst.}, year = {2015}, language = {de} } @book{Esch2013, author = {Esch, Thomas}, title = {Experimentelle Untersuchungen an Antriebssystemen von Kraft-, Luft- und Raumfahrzeugen : Vorlesungsumdruck. 2. Aufl. Bd. 1}, edition = {2. Aufl.}, publisher = {Fachhochschule Aachen, Lehr- und Forschungsgebiet Thermodynamik und Verbrennungstechnik}, address = {Aachen}, pages = {Getr. Z{\"a}hlung : Ill. und graph. Darst.}, year = {2013}, language = {de} } @inproceedings{HorikawaOkadaKazarietal.2015, author = {Horikawa, Atsushi and Okada, Kunio and Kazari, Masahide and Funke, Harald and Keinz, Jan and Kusterer, Karsten and Haj Ayed, Anis}, title = {Application of Low NOx Micro-Mix Hydrogen Combustion to Industrial Gas Turbine Combustor and Conceptual Design}, series = {Proceedings of International Gas Turbine Congress 2015 Tokyo November 15-20, 2015, Tokyo, Japan}, booktitle = {Proceedings of International Gas Turbine Congress 2015 Tokyo November 15-20, 2015, Tokyo, Japan}, isbn = {978-4-89111-008-6}, pages = {141 -- 146}, year = {2015}, language = {en} } @inproceedings{FunkeKeinzHajAyedetal.2015, author = {Funke, Harald and Keinz, Jan and Haj Ayed, A. and Kazari, M. and Kitajima, J. and Horikawa, A. and Okada, K.}, title = {Development and Testing of a Low NOx Micromix Combustion Chamber for an Industrial Gas Turbine}, series = {Proceedings of International Gas Turbine Congress 2015 Tokyo November 15-20, 2015, Tokyo, Japan}, booktitle = {Proceedings of International Gas Turbine Congress 2015 Tokyo November 15-20, 2015, Tokyo, Japan}, isbn = {978-4-89111-008-6}, pages = {131 -- 140}, year = {2015}, language = {en} } @incollection{WolffSeefeldtBaueretal.2014, author = {Wolff, Nino and Seefeldt, Patric and Bauer, Wolfgang and Fiebig, Christopher and Gerding, Patrick and Parow-Souchon, Kai and Pongs, Anna and Reiffenrath, Matti and Ziemann, Thomas}, title = {Alternative application of solar sail technology}, series = {Advances in solar sailing}, booktitle = {Advances in solar sailing}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-642-34906-5 (Print) ; 978-3-642-34907-2 (E-Book)}, doi = {10.1007/978-3-642-34907-2_23}, pages = {351 -- 365}, year = {2014}, abstract = {The development of Gossamer sail structures for solar sails contributes to a large field of future space applications like thin film solar generators, membrane antennas and drag sails. The focus of this paper is the development of a drag sail based on solar sail technology that could contribute to a reduction of space debris in low Earth orbits. The drag sail design and its connections to solar sail development, a first test on a sounding rocket, as well as the ongoing integration of the drag sail into a triple CubeSat is presented.}, language = {en} } @inproceedings{SchirraWatmuffBauschat2014, author = {Schirra, Julian and Watmuff, Jon and Bauschat, J.-Michael}, title = {A relative assessment of existing potential-methodologies to accurately estimate the induced drag of highly non-planar lifting systems}, series = {Advanced aero concepts, design and operations : Applied Aerodynamics Conference : July 22 -24, 2014, Bristol, UK}, booktitle = {Advanced aero concepts, design and operations : Applied Aerodynamics Conference : July 22 -24, 2014, Bristol, UK}, organization = {Applied Aerodynamics Conference <2014, Bristol>}, pages = {1 -- 13}, year = {2014}, language = {en} } @article{StadlerGarveyEmbsetal.2014, author = {Stadler, Alexander Maximilian and Garvey, Christopher J. and Embs, Jan Peter and Koza, Michael Marek and Unruh, Tobias and Artmann, Gerhard and Zaccai, Guiseppe}, title = {Picosecond dynamics in haemoglobin from different species: A quasielastic neutron scattering study}, series = {Biochimica et biophysica acta (BBA): General Subjects}, volume = {1840}, journal = {Biochimica et biophysica acta (BBA): General Subjects}, number = {10}, publisher = {Elsevier}, address = {Amsterdam}, issn = {1872-8006 (E-Journal); 0304-4165 (Print)}, doi = {10.1016/j.bbagen.2014.06.007}, pages = {2989 -- 2999}, year = {2014}, language = {en} } @techreport{EschEickmannCoussementetal.2013, author = {Esch, Thomas and Eickmann, Matthias and Coussement, Axel and Kalbhenn, Hartmut}, title = {Wasserstoffspezifische Abstimmung der Ladungswechselvorg{\"a}nge eines Verbrennungsmotors mit Direkteinblasung : Schlussbericht f{\"u}r das Forschungsvorhaben ; Kurztitel: HydI - Hydrogen direct injection ; F{\"o}rderperiode 01.07.2008 - 31.12.2011 / FH Aachen, Thermodynamik und Verbrennungstechnik}, address = {Aachen}, organization = {FH Aachen}, pages = {Online-Ressource (PDF-Datei: 94 S.) : Ill., graph. Darst.}, year = {2013}, language = {de} } @book{BenkoePlescher2013, author = {Benk{\"o}, Marietta and Plescher, Engelbert}, title = {Space law: reconsidering the definition/delimitation question and the passage of spacecraft through foreign airspace. (Essential air and space law ; 12)}, publisher = {Eleven International Publishing}, address = {The Hague}, isbn = {9789462360761 ; 9462360766 ; 9789460948176}, pages = {VII, 159 S.}, year = {2013}, language = {en} } @inproceedings{PlescherMathiakWillnecker2005, author = {Plescher, Engelbert and Mathiak, Gerhard and Willnecker, Rainer}, title = {Technical aspects of liquid diffusion model experiments}, series = {55th International Astronautical Congress : October 4 - 8, 2004, Vancouver, Canada / International Astronautical Federation. Bd. 8. IAC-04-J.5.04}, booktitle = {55th International Astronautical Congress : October 4 - 8, 2004, Vancouver, Canada / International Astronautical Federation. Bd. 8. IAC-04-J.5.04}, publisher = {International Astronautical Federation}, address = {Paris}, organization = {International Astronautical Congress <55, 2004, Vancouver>}, pages = {5019 -- 5025}, year = {2005}, language = {en} } @article{MathiakPlescherWillnecker2005, author = {Mathiak, Gerhard and Plescher, Engelbert and Willnecker, Rainer}, title = {Liquid metal diffusion experiments in microgravity - Vibrational effects}, series = {Measurement science and technology}, volume = {Vol. 16}, journal = {Measurement science and technology}, number = {No. 2}, issn = {0957-0233}, doi = {10.1088/0957-0233/16/2/003}, pages = {336}, year = {2005}, language = {en} } @article{MathiakWillneckerPlescher2005, author = {Mathiak, Gerhard and Willnecker, Rainer and Plescher, Engelbert}, title = {Vibrational effects on diffusion experiments}, series = {Microgravity science and technology : international journal for microgravity research and applications}, volume = {Vol. 15}, journal = {Microgravity science and technology : international journal for microgravity research and applications}, number = {No. 1}, issn = {0938-0108}, pages = {295 -- 300}, year = {2005}, language = {en} } @inproceedings{MathiakPlescherWillnecker2003, author = {Mathiak, Gerhard and Plescher, Engelbert and Willnecker, Rainer}, title = {Parabolic flight experiments about vibrational effects on diffusion experiments}, series = {54th International Astronautical Congress of the International Astronautical Federation (IAF) : Bremen, 29 Sept. 2003 through 3 Oct. 2003 ; vol. 1}, booktitle = {54th International Astronautical Congress of the International Astronautical Federation (IAF) : Bremen, 29 Sept. 2003 through 3 Oct. 2003 ; vol. 1}, organization = {International Astronautical Congress of the International Astronautical Federation <54, 2003, Bremen>}, pages = {4389 -- 4396}, year = {2003}, language = {de} } @article{HoevelerJanserBindewaldetal.2015, author = {Hoeveler, Bastian and Janser, Frank and Bindewald, Thorsten and Gebhardt, Andreas}, title = {Entwurf, Fertigung und Untersuchung eines Windkanalmodells eines innovativen, senkrechtstartenden Kleinflugzeuges}, series = {RTejournal - Forum f{\"u}r Rapid Technologie}, journal = {RTejournal - Forum f{\"u}r Rapid Technologie}, number = {12}, publisher = {Fachhochschule Aachen}, address = {Aachen}, issn = {1614-0923}, url = {http://nbn-resolving.de/urn:nbn:de:0009-2-42921}, pages = {1 -- 5}, year = {2015}, language = {de} } @inproceedings{RoosenFeyerl2015, author = {Roosen, Petra and Feyerl, G{\"u}nter}, title = {Gender-specific perception and utilization of personal use vehicles}, series = {FISITA World Automotive Congress 2014 : Maastricht, The Netherlands, 2 - 6 June / [organised by the International Federation of Automotive Engineering Societies (FISITA) ...]. Bd. 1}, booktitle = {FISITA World Automotive Congress 2014 : Maastricht, The Netherlands, 2 - 6 June / [organised by the International Federation of Automotive Engineering Societies (FISITA) ...]. Bd. 1}, publisher = {Curran}, address = {Red Hook, NY}, isbn = {978-1-5108-0209-4}, pages = {418 -- 425}, year = {2015}, language = {en} } @inproceedings{HorikawaKazariOkadaetal.2015, author = {Horikawa, Atsushi and Kazari, Masahide and Okada, Kunio and Funke, Harald and Keinz, Jan and Kusterer, Karsten and Haji Ayed, Anis}, title = {Developments of Hydrogen Dry Low Emission Combustion Technology}, series = {Annual Congress of Gas Turbine Society Japan, 2015}, booktitle = {Annual Congress of Gas Turbine Society Japan, 2015}, pages = {5 S.}, year = {2015}, language = {en} } @book{JanserHavermann2015, author = {Janser, Frank and Havermann, Marc}, title = {Inkompressible Str{\"o}mungen}, edition = {3. Aufl.}, publisher = {Verlagshaus Mainz GmbH}, address = {Aachen}, isbn = {978-3-86130-446-3}, pages = {VIII, 83 S. : Ill ; Diagramme}, year = {2015}, language = {de} } @article{FunkeBeckmann2022, author = {Funke, Harald and Beckmann, Nils}, title = {Flexible fuel operation of a Dry-Low-NOx Micromix Combustor with Variable Hydrogen Methane Mixture}, series = {International Journal of Gas Turbine, Propulsion and Power Systems}, volume = {13}, journal = {International Journal of Gas Turbine, Propulsion and Power Systems}, number = {2}, issn = {1882-5079}, pages = {1 -- 7}, year = {2022}, abstract = {The role of hydrogen (H2) as a carbon-free energy carrier is discussed since decades for reducing greenhouse gas emissions. As bridge technology towards a hydrogen-based energy supply, fuel mixtures of natural gas or methane (CH4) and hydrogen are possible. The paper presents the first test results of a low-emission Micromix combustor designed for flexible-fuel operation with variable H2/CH4 mixtures. The numerical and experimental approach for considering variable fuel mixtures instead of recently investigated pure hydrogen is described. In the experimental studies, a first generation FuelFlex Micromix combustor geometry is tested at atmospheric pressure at gas turbine operating conditions corresponding to part- and full-load. The H2/CH4 fuel mixture composition is varied between 57 and 100 vol.\% hydrogen content. Despite the challenges flexible-fuel operation poses onto the design of a combustion system, the evaluated FuelFlex Micromix prototype shows a significant low NOx performance}, language = {en} } @article{BergmannMoehrenBraunetal.2023, author = {Bergmann, Ole and M{\"o}hren, Felix and Braun, Carsten and Janser, Frank}, title = {On the influence of elasticity on swept propeller noise}, series = {AIAA SCITECH 2023 Forum}, journal = {AIAA SCITECH 2023 Forum}, publisher = {AIAA}, address = {Reston, Va.}, doi = {10.2514/6.2023-0210}, year = {2023}, abstract = {High aerodynamic efficiency requires propellers with high aspect ratios, while propeller sweep potentially reduces noise. Propeller sweep and high aspect ratios increase elasticity and coupling of structural mechanics and aerodynamics, affecting the propeller performance and noise. Therefore, this paper analyzes the influence of elasticity on forward-swept, backward-swept, and unswept propellers in hover conditions. A reduced-order blade element momentum approach is coupled with a one-dimensional Timoshenko beam theory and Farassat's formulation 1A. The results of the aeroelastic simulation are used as input for the aeroacoustic calculation. The analysis shows that elasticity influences noise radiation because thickness and loading noise respond differently to deformations. In the case of the backward-swept propeller, the location of the maximum sound pressure level shifts forward by 0.5 °, while in the case of the forward-swept propeller, it shifts backward by 0.5 °. Therefore, aeroacoustic optimization requires the consideration of propeller deformation.}, language = {en} } @inproceedings{FunkeBeckmann2019, author = {Funke, Harald and Beckmann, Nils}, title = {Flexible Fuel Operation of a Dry-Low-Nox Micromix Combustor with Variable Hydrogen Methane Mixtures}, series = {Proceedings of International Gas Turbine Congress 2019 Tokyo, November 17-22, 2019, Tokyo, Japan}, booktitle = {Proceedings of International Gas Turbine Congress 2019 Tokyo, November 17-22, 2019, Tokyo, Japan}, isbn = {978-4-89111-010-9}, year = {2019}, language = {en} } @inproceedings{FunkeBeckmannKeinzetal.2021, author = {Funke, Harald and Beckmann, Nils and Keinz, Jan and Horikawa, Atsushi}, title = {30 years of dry low NOx micromix combustor research for hydrogen-rich fuels: an overview of past and present activities}, series = {Conference Proceedings Turbo Expo: Power for Land, Sea and Air, Volume 4B: Combustion, Fuels, and Emissions}, booktitle = {Conference Proceedings Turbo Expo: Power for Land, Sea and Air, Volume 4B: Combustion, Fuels, and Emissions}, publisher = {ASME}, address = {New York, NY}, isbn = {978-0-7918-8413-3}, doi = {10.1115/GT2020-16328}, pages = {14 Seiten}, year = {2021}, abstract = {The paper presents an overview of the past and present of low-emission combustor research with hydrogen-rich fuels at Aachen University of Applied Sciences. In 1990, AcUAS started developing the Dry-Low-NOx Micromix combustion technology. Micromix reduces NOx emissions using jet-in-crossflow mixing of multiple miniaturized fuel jets and combustor air with an inherent safety against flashback. At first, pure hydrogen as fuel was investigated with lab-scale applications. Later, Micromix prototypes were developed for the use in an industrial gas turbine Honeywell/Garrett GTCP-36-300, proving low NOx characteristics during real gas turbine operation, accompanied by the successful definition of safety laws and control system modifications. Further, the Micromix was optimized for the use in annular and can combustors as well as for fuel-flexibility with hydrogen-methane-mixtures and hydrogen-rich syngas qualities by means of extensive experimental and numerical simulations. In 2020, the latest Micromix application will be demonstrated in a commercial 2 MW-class gas turbine can-combustor with full-scale engine operation. The paper discusses the advances in Micromix research over the last three decades.}, language = {en} } @inproceedings{ReimerBraunBallmann2006, author = {Reimer, Lars and Braun, Carsten and Ballmann, Josef}, title = {Analysis of the static and dynamic aero-structural response of an elastic swept wing model by direct aeroelastic simulation}, series = {ICAS 2006 proceedings : 25th Congress of the International Council of the Aeronautical Sciences ; Hamburg, Germany, 3 - 8 September, 2006 : 25th International Congress of Aeronautical Sciences}, booktitle = {ICAS 2006 proceedings : 25th Congress of the International Council of the Aeronautical Sciences ; Hamburg, Germany, 3 - 8 September, 2006 : 25th International Congress of Aeronautical Sciences}, publisher = {Optimage}, address = {Edinburgh}, organization = {International Council of the Aeronautical Sciences (ICAS)}, isbn = {0-9533991-7-6}, pages = {Paper No. 2006-10.3.3}, year = {2006}, language = {en} } @article{PeloniDachwaldCeriotti2017, author = {Peloni, Alessandro and Dachwald, Bernd and Ceriotti, Matteo}, title = {Multiple near-earth asteroid rendezvous mission: Solar-sailing options}, series = {Advances in Space Research}, journal = {Advances in Space Research}, number = {In Press, Corrected Proof}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0273-1177}, doi = {10.1016/j.asr.2017.10.017}, year = {2017}, language = {en} } @inproceedings{LoebSchartnerDachwaldetal.2007, author = {Loeb, Horst Wolfgang and Schartner, Karl-Heinz and Dachwald, Bernd and Seboldt, Wolfgang}, title = {SEP-Sample return from a main belt asteroid}, series = {30th International Electric Propulsion Conference}, booktitle = {30th International Electric Propulsion Conference}, pages = {1 -- 11}, year = {2007}, abstract = {By DLR-contact, sample return missions to the large main-belt asteroid "19, Fortuna" have been studied. The mission scenario has been based on three ion thrusters of the RIT-22 model, which is presently under space qualification, and on solar arrays equipped with triple-junction GaAs solar cells. After having designed the spacecraft, the orbit-to-orbit trajectories for both, a one-way SEP mission with a chemical sample return and an all-SEP return mission, have been optimized using a combination of artificial neural networks with evolutionary algorithms. Additionally, body-to-body trajectories have been investigated within a launch period between 2012 and 2015. For orbit-to-orbit calculation, the launch masses of the hybrid mission and of the all-SEP mission resulted in 2.05 tons and 1.56 tons, respectively, including a scientific payload of 246 kg. For the related transfer durations 4.14 yrs and 4.62 yrs were obtained. Finally, a comparison between the mission scenarios based on SEP and on NEP have been carried out favouring clearly SEP.}, language = {en} } @article{DachwaldSeboldtLoebetal.2008, author = {Dachwald, Bernd and Seboldt, Wolfgang and Loeb, H. W. and Schartner, Karl-Heinz}, title = {Main Belt Asteroid Sample Return Mission Using Solar Electric Propulsion}, series = {Acta Astronautica. 63 (2008), H. 1-4}, journal = {Acta Astronautica. 63 (2008), H. 1-4}, isbn = {0094-5765}, pages = {91 -- 101}, year = {2008}, language = {en} } @article{KezerashviliDachwald2021, author = {Kezerashvili, Roman Ya and Dachwald, Bernd}, title = {Preface: Solar sailing: Concepts, technology, and missions II}, series = {Advances in Space Research}, volume = {67}, journal = {Advances in Space Research}, number = {9}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0273-1177}, doi = {10.1016/j.asr.2021.01.037}, pages = {2559 -- 2560}, year = {2021}, language = {en} } @inproceedings{DachwaldOhndorfSpurmannetal.2009, author = {Dachwald, Bernd and Ohndorf, Andreas and Spurmann, J. and Loeb, H. W. and Schartner, Karl-Heinz and Seboldt, Wolfgang}, title = {Mission design for a SEP mission to saturn}, series = {60th International Astronautical Congress 2009 (IAC 2009)}, booktitle = {60th International Astronautical Congress 2009 (IAC 2009)}, publisher = {Curran Associates, Inc.}, address = {Red Hook, NY}, isbn = {978-1-61567-908-9}, pages = {11 Seiten}, year = {2009}, abstract = {Within ESA's Cosmic Vision 2015-2025 plan, a mission to explore the Saturnian System, with special emphasis on its two moons Titan and Enceladus, was selected for study, termed TANDEM (Titan and Enceladus Mission). In this paper, we describe an optimized mission design for a TANDEM-derived solar electric propulsion (SEP) mission. We have chosen the SEP mission scenario for the interplanetary transfer of the TANDEM spacecraft because all feasible gravity assist sequences for a chemical transfer between 2015 and 2025 result in long flight times of about nine years. Our SEP system is based on the German RIT ion engine. For our optimized mission design, we have extensively explored the SEP parameter space (specific impulse, thrust level, power level) and have calculated an optimal interplanetary trajectory for each setting. In contrast to the original TANDEM mission concept, which intends to use two launch vehicles and an all-chemical transfer, our SEP mission design requires only a single Ariane 5 ECA launch for the same payload mass. Without gravity assist, it yields a faster and more flexible transfer with a fight time of less than seven years, and an increased payload ratio. Our mission design proves thereby the capability of SEP even for missions into the outer solar system.}, language = {en} } @misc{MachadoDahmannKeimeretal.2020, author = {Machado, Patricia Almeida and Dahmann, Peter and Keimer, Jona and Saretzki, Charlotte and St{\"u}bing, Felix and K{\"u}pper, Thomas}, title = {Stress profile and individual workload monitoring in general aviation pilots - an experiment's setting}, series = {23. Annual Meeting of the German Society of Travel Medicine, Coburg, 18.-19.9.2020}, journal = {23. Annual Meeting of the German Society of Travel Medicine, Coburg, 18.-19.9.2020}, doi = {10.55225/hppa.156}, year = {2020}, language = {en} } @article{DachwaldOhndorfSeboldt2005, author = {Dachwald, Bernd and Ohndorf, A. and Seboldt, Wolfgang}, title = {Optimierung der Lageregelung von Raumfahrzeugen mit Niedrigschubantrieb mittels evolution{\"a}rer neuronaler Regler / A. Ohndorf ; B. Dachwald ; W. Seboldt}, series = {Deutscher Luft- und Raumfahrtkongress 2005 : Friedrichshafen, 26. bis 29. September 2005, Motto: Luft- und Raumfahrt - Grenzen {\"u}berwinden, Horizonte erweitern / Deutsche Gesellschaft f{\"u}r Luft- und Raumfahrt - Lilienthal-Oberth e.V. (DGLR). [Red.: Peter Brandt (verantwortlich)]. Bd. 3. - (Jahrbuch ... der Deutschen Gesellschaft f{\"u}r Luft- und Raumfahrt}, journal = {Deutscher Luft- und Raumfahrtkongress 2005 : Friedrichshafen, 26. bis 29. September 2005, Motto: Luft- und Raumfahrt - Grenzen {\"u}berwinden, Horizonte erweitern / Deutsche Gesellschaft f{\"u}r Luft- und Raumfahrt - Lilienthal-Oberth e.V. (DGLR). [Red.: Peter Brandt (verantwortlich)]. Bd. 3. - (Jahrbuch ... der Deutschen Gesellschaft f{\"u}r Luft- und Raumfahrt}, publisher = {DGLR}, address = {Bonn}, pages = {1971 -- 1978}, year = {2005}, language = {de} } @inproceedings{FunkeBeckmannAbanteriba2017, author = {Funke, Harald and Beckmann, Nils and Abanteriba, Sylvester}, title = {A comparison of complex chemistry mechanisms for hydrogen methane blends based on the Sandia / Sydney Bluff-Body Flame HM1}, series = {Proceedings of the Eleventh Asia-Pacific Conference on Combustion (ASPACC 2017), New South Wales, Australia, 10-14 December 2017}, booktitle = {Proceedings of the Eleventh Asia-Pacific Conference on Combustion (ASPACC 2017), New South Wales, Australia, 10-14 December 2017}, isbn = {978-1-5108-5646-2}, pages = {262 -- 265}, year = {2017}, language = {en} } @article{SpietzSproewitzSeefeldtetal.2021, author = {Spietz, Peter and Spr{\"o}witz, Tom and Seefeldt, Patric and Grundmann, Jan Thimo and Jahnke, Rico and Mikschl, Tobias and Mikulz, Eugen and Montenegro, Sergio and Reershemius, Siebo and Renger, Thomas and Ruffer, Michael and Sasaki, Kaname and Sznajder, Maciej and T{\´o}th, Norbert and Ceriotti, Matteo and Dachwald, Bernd and Macdonald, Malcolm and McInnes, Colin and Seboldt, Wolfgang and Quantius, Dominik and Bauer, Waldemar and Wiedemann, Carsten and Grimm, Christian D. and Hercik, David and Ho, Tra-Mi and Lange, Caroline and Schmitz, Nicole}, title = {Paths not taken - The Gossamer roadmap's other options}, series = {Advances in Space Research}, volume = {67}, journal = {Advances in Space Research}, number = {9}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0273-1177}, doi = {10.1016/j.asr.2021.01.044}, pages = {2912 -- 2956}, year = {2021}, language = {en} } @inproceedings{DachwaldWurm2009, author = {Dachwald, Bernd and Wurm, P.}, title = {Design concept and modeling of an advanced solar photon thruster}, series = {Advances in the Astronautical Sciences}, booktitle = {Advances in the Astronautical Sciences}, publisher = {American Astronautical Society}, address = {San Diego, Calif.}, isbn = {978-087703554-1}, issn = {00653438}, pages = {723 -- 740}, year = {2009}, abstract = {The so-called "compound solar sail", also known as "Solar Photon Thruster" (SPT), holds the potential of providing significant performance advantages over the flat solar sail. Previous SPT design concepts, however, do not consider shadowing effects and multiple reflections of highly concentrated solar radiation that would inevitably destroy the gossamer sail film. In this paper, we propose a novel advanced SPT (ASPT) design concept that does not suffer from these oversimplifications. We present the equations that describe the thrust force acting on such a sail system and compare its performance with respect to the conventional flat solar sail.}, language = {en} } @article{DachwaldBaturkinCoverstoneetal.2006, author = {Dachwald, Bernd and Baturkin, Volodymyr and Coverstone, Victoria L. and Dietrich, Benjamin and Garbe, Gregory P. and G{\"o}rlich, Marianne and Leipold, Manfred and Lura, Franz and Macdonald, Malcolm and McInnes, Colin R. and Mengali, Giovanni and Quatra, Alessandro A. and Rios-Reyes, Leonel and Scheeres, Daniel J. and Seboldt, Wolfgang and Wie, Bong}, title = {Potential Effects of Optical Solar Sail Degradation on Interplanetary Trajectory Design}, series = {Astrodynamics 2005 : proceedings of the AAS/AIAA astrodynamics conference held August 7 - 11, 2005, South Lake Tahoe, California / ed. by Bobby G. Williams. - Pt. 3. - (Advances in the astronautical sciences ; 123,3)}, journal = {Astrodynamics 2005 : proceedings of the AAS/AIAA astrodynamics conference held August 7 - 11, 2005, South Lake Tahoe, California / ed. by Bobby G. Williams. - Pt. 3. - (Advances in the astronautical sciences ; 123,3)}, publisher = {Univelt}, address = {San Diego, Calif.}, isbn = {0-87703-527-X}, pages = {2569 -- 2592}, year = {2006}, language = {en} } @article{DachwaldSeboldtRichter2006, author = {Dachwald, Bernd and Seboldt, Wolfgang and Richter, L.}, title = {Multiple rendezvous and sample return missions to near-Earth objects using solar sailcraft / Dachwald, B. ; Seboldt, W. ; Richter, L.}, series = {Acta Astronautica. 59 (2006), H. 8-11}, journal = {Acta Astronautica. 59 (2006), H. 8-11}, isbn = {0094-5765}, pages = {768 -- 776}, year = {2006}, language = {en} } @inproceedings{GrundmannBieleDachwaldetal.2017, author = {Grundmann, Jan Thimo and Biele, Jens and Dachwald, Bernd and Grimm, Christian D. and Lange, Caroline and Ulamec, Stephan and Ziach, Christian and Spr{\"o}witz, Tom and Ruffer, Michael and Seefeldt, Patric and Spietz, Peter and Toth, Norbert and Mimasu, Yuya and Rittweger, Andreas and Bibring, Jean-Pierre and Braukhane, Andy and Boden, Ralf Christian and Dumont, Etienne and Jahnke, Stephan Siegfried and Jetzschmann, Michael and Kr{\"u}ger, Hans and Lange, Michael and Gomez, Antonio Martelo and Massonett, Didier and Okada, Tatsuaki and Sagliano, Marco and Sasaki, Kaname and Schr{\"o}der, Silvio and Sippel, Martin and Skoczylas, Thomas and Wejmo, Elisabet}, title = {Small landers and separable sub-spacecraft for near-term solar sails}, series = {The Fourth International Symposium on Solar Sailing 2017}, booktitle = {The Fourth International Symposium on Solar Sailing 2017}, pages = {1 -- 10}, year = {2017}, abstract = {Following the successful PHILAE landing with ESA's ROSETTA probe and the launch of the MINERVA rovers and the Mobile Asteroid Surface Scout, MASCOT, aboard the JAXA space probe, HAYABUSA2, to asteroid (162173) Ryugu, small landers have found increasing interest. Integrated at the instrument level in their mothership they support small solar system body studies. With efficient capabilities, resource-friendly design and inherent robustness they are an attractive exploration mission element. We discuss advantages and constraints of small sub-spacecraft, focusing on emerging areas of activity such as asteroid diversity studies, planetary defence, and asteroid mining, on the background of our projects PHILAE, MASCOT, MASCOT2, the JAXA-DLR Solar Power Sail Lander Design Study, and others. The GOSSAMER-1 solar sail deployment concept also involves independent separable sub-spacecraft operating synchronized to deploy the sail. Small spacecraft require big changes in the way we do things and occasionally a little more effort than would be anticipated based on a traditional large spacecraft approach. In a Constraints-Driven Engineering environment we apply Concurrent Design and Engineering (CD/CE), Concurrent Assembly, Integration and Verification (CAIV) and Model-Based Systems Engineering (MBSE). Near-term solar sails will likely be small spacecraft which we expect to harmonize well with nano-scale separable instrument payload packages.}, language = {en} } @article{DahmannHagemeisterNageletal.2006, author = {Dahmann, Peter and Hagemeister, Wilhelm and Nagel, G{\"u}nther and Exner, Peter}, title = {Geregelte Innenzahnradpumpe im Mehrquadrantenbetrieb Geschwindigkeits- und Positionsregelung eines hydraulischen Handlingger{\"a}tes}, series = {O+P {\"O}lhydraulik und Pneumatik. 24 (2006), H. 1}, journal = {O+P {\"O}lhydraulik und Pneumatik. 24 (2006), H. 1}, isbn = {0341-2660}, pages = {24 -- 28}, year = {2006}, language = {de} } @inproceedings{GrundmannBauerBodenetal.2019, author = {Grundmann, Jan Thimo and Bauer, Waldemar and Boden, Ralf and Ceriotti, Matteo and Chand, Suditi and Cordero, Federico and Dachwald, Bernd and Dumont, Etienne and Grimm, Christian D. and Heiligers, Jeannette and Herč{\´i}k, David and H{\´e}rique, Alain and Ho, Tra-Mi and Jahnke, Rico and Kofman, Wlodek and Lange, Caroline and Lichtenheldt, Roy and McInnes, Colin and Meß, Jan-Gerd and Mikschl, Tobias and Mikulz, Eugen and Montenegro, Sergio and Moore, Iain and Pelivan, Ivanka and Peloni, Alessandro and Plettemeier, Dirk and Quantius, Dominik and Reershemius, Siebo and Renger, Thomas and Riemann, Johannes and Rogez, Yves and Ruffer, Michael and Sasaki, Kaname and Schmitz, Nicole and Seboldt, Wolfgang and Seefeldt, Patric and Spietz, Peter and Spr{\"o}witz, Tom and Sznajder, Maciej and T{\´o}th, Norbert and Vergaaij, Merel and Viavattene, Giulia and Wejmo, Elisabet and Wiedemann, Carsten and Wolff, Friederike and Ziach, Christian}, title = {Flights are ten a sail - Re-use and commonality in the design and system engineering of small spacecraft solar sail missions with modular hardware for responsive and adaptive exploration}, series = {70th International Astronautical Congress (IAC)}, booktitle = {70th International Astronautical Congress (IAC)}, isbn = {9781713814856}, pages = {1 -- 7}, year = {2019}, language = {en} } @incollection{ReimerWellmerBraunetal.2009, author = {Reimer, Lars and Wellmer, Georg and Braun, Carsten and Ballmann, Josef}, title = {Computational methods for aero-structural analysis and optimisation of aircrafts based on reduced-order structural models}, series = {MEGADESIGN and MegaOpt - German initiatives for aerodynamic simulation and optimization in aircraft design. Results of the closing symposium of the MEGADESIGN and MegaOpt projects, Braunschweig, Germany, 23 - 24 May, 2007 / Norbert Kroll ... (Eds.) Notes on numerical fluid mechanics and multidisciplinary design. Vol. 107}, booktitle = {MEGADESIGN and MegaOpt - German initiatives for aerodynamic simulation and optimization in aircraft design. Results of the closing symposium of the MEGADESIGN and MegaOpt projects, Braunschweig, Germany, 23 - 24 May, 2007 / Norbert Kroll ... (Eds.) Notes on numerical fluid mechanics and multidisciplinary design. Vol. 107}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-642-04092-4}, pages = {135 -- 150}, year = {2009}, abstract = {In this part of the MEGADESIGN project, aeroelastic effects are introduced into the aerodynamic analysis of aircrafts by coupling DLR's flow solvers TAU and FLOWer to a Timoshenko-beam solver. The emerging aeroelastic solvers and a method for the automatic identification of Timoshenko-beam models for wing-box structures were integrated into a simulation environment enabling the combined optimisation of aerodynamic wing shape and structure.}, language = {en} } @article{Dachwald2004, author = {Dachwald, Bernd}, title = {Evolutionary Neurocontrol: A Smart Method for Global Optimization of Low-Thrust Trajectories}, series = {22nd AIAA Applied Aerodynamics Conference and Exhibit - AIAA/AAS Astrodynamics Specialist Conference and Exhibit - AIAA Guidance, Navigation, and Control Conference and Exhibit - AIAA Modeling and Simulation Technologies Conference and Exhibit - AIAA Atmospheric Flight Mechanics Conference and Exhibit : 16 - 19 August 2004, Providence, Rhode Island / American Institute of Aeronautics and Astronautics. - (AIAA meeting papers on disc ; 2004,14-15)}, journal = {22nd AIAA Applied Aerodynamics Conference and Exhibit - AIAA/AAS Astrodynamics Specialist Conference and Exhibit - AIAA Guidance, Navigation, and Control Conference and Exhibit - AIAA Modeling and Simulation Technologies Conference and Exhibit - AIAA Atmospheric Flight Mechanics Conference and Exhibit : 16 - 19 August 2004, Providence, Rhode Island / American Institute of Aeronautics and Astronautics. - (AIAA meeting papers on disc ; 2004,14-15)}, publisher = {American Inst. of Aeronautics and Astronautics}, address = {Reston, Va.}, pages = {2 CD-ROMs}, year = {2004}, language = {en} } @article{HeiligersSchoutetensDachwald2021, author = {Heiligers, Jeannette and Schoutetens, Frederic and Dachwald, Bernd}, title = {Photon-sail equilibria in the alpha centauri system}, series = {Journal of Guidance, Control, and Dynamics}, volume = {44}, journal = {Journal of Guidance, Control, and Dynamics}, number = {5}, issn = {1533-3884}, doi = {10.2514/1.G005446}, pages = {1053 -- 1061}, year = {2021}, language = {en} } @article{NeuJanserKhatibietal.2016, author = {Neu, Eugen and Janser, Frank and Khatibi, Akbar A. and Braun, Carsten and Orifici, Adrian C.}, title = {Operational Modal Analysis of a wing excited by transonic flow}, series = {Aerospace Science and Technology}, volume = {49}, journal = {Aerospace Science and Technology}, publisher = {Elsevier}, address = {Amsterdam}, issn = {1270-9638}, doi = {10.1016/j.ast.2015.11.032}, pages = {73 -- 79}, year = {2016}, abstract = {Operational Modal Analysis (OMA) is a promising candidate for flutter testing and Structural Health Monitoring (SHM) of aircraft wings that are passively excited by wind loads. However, no studies have been published where OMA is tested in transonic flows, which is the dominant condition for large civil aircraft and is characterized by complex and unique aerodynamic phenomena. We use data from the HIRENASD large-scale wind tunnel experiment to automatically extract modal parameters from an ambiently excited wing operated in the transonic regime using two OMA methods: Stochastic Subspace Identification (SSI) and Frequency Domain Decomposition (FDD). The system response is evaluated based on accelerometer measurements. The excitation is investigated from surface pressure measurements. The forcing function is shown to be non-white, non-stationary and contaminated by narrow-banded transonic disturbances. All these properties violate fundamental OMA assumptions about the forcing function. Despite this, all physical modes in the investigated frequency range were successfully identified, and in addition transonic pressure waves were identified as physical modes as well. The SSI method showed superior identification capabilities for the investigated case. The investigation shows that complex transonic flows can interfere with OMA. This can make existing approaches for modal tracking unsuitable for their application to aircraft wings operated in the transonic flight regime. Approaches to separate the true physical modes from the transonic disturbances are discussed.}, language = {en} } @inproceedings{ThomaFisherBertrandetal.2020, author = {Thoma, Andreas and Fisher, Alex and Bertrand, Olivier and Braun, Carsten}, title = {Evaluation of possible flight strategies for close object evasion from bumblebee experiments}, series = {Living Machines 2020: Biomimetic and Biohybrid Systems}, booktitle = {Living Machines 2020: Biomimetic and Biohybrid Systems}, editor = {Vouloutsi, Vasiliki and Mura, Anna and Tauber, Falk and Speck, Thomas and Prescott, Tony J. and Verschure, Paul F. M. J.}, publisher = {Springer}, address = {Cham}, isbn = {978-3-030-64312-6}, doi = {10.1007/978-3-030-64313-3_34}, pages = {354 -- 365}, year = {2020}, language = {en} } @article{GoettenHavermannBraunetal.2020, author = {G{\"o}tten, Falk and Havermann, Marc and Braun, Carsten and Marino, Matthew and Bil, Cees}, title = {Airfoil drag at low-to-medium reynolds numbers: A novel estimation method}, series = {AIAA Journal}, volume = {58}, journal = {AIAA Journal}, number = {7}, publisher = {AIAA}, address = {Reston, Va.}, issn = {1533-385X}, doi = {10.2514/1.J058983}, pages = {2791 -- 2805}, year = {2020}, abstract = {This paper presents a novel method for airfoil drag estimation at Reynolds numbers between 4×10⁵ and 4×10⁶. The novel method is based on a systematic study of 40 airfoils applying over 600 numerical simulations and considering natural transition. The influence of the airfoil thickness-to-chord ratio, camber, and freestream Reynolds number on both friction and pressure drag is analyzed in detail. Natural transition significantly affects drag characteristics and leads to distinct drag minima for different Reynolds numbers and thickness-to-chord ratios. The results of the systematic study are used to develop empirical correlations that can accurately predict an airfoil drag at low-lift conditions. The new approach estimates a transition location based on airfoil thickness-to-chord ratio, camber, and Reynolds number. It uses the transition location in a mixed laminar-turbulent skin-friction calculation, and corrects the skin-friction coefficient for separation effects. Pressure drag is estimated separately based on correlations of thickness-to-chord ratio, camber, and Reynolds number. The novel method shows excellent accuracy when compared with wind-tunnel measurements of multiple airfoils. It is easily integrable into existing aircraft design environments and is highly beneficial in the conceptual design stage.}, language = {en} } @article{ThomaThomessenGardietal.2023, author = {Thoma, Andreas and Thomessen, Karolin and Gardi, Alessandro and Fisher, A. and Braun, Carsten}, title = {Prioritising paths: An improved cost function for local path planning for UAV in medical applications}, series = {The Aeronautical Journal}, journal = {The Aeronautical Journal}, number = {First View}, publisher = {Cambridge University Press}, address = {Cambridge}, issn = {0001-9240 (Print)}, doi = {10.1017/aer.2023.68}, pages = {1 -- 18}, year = {2023}, abstract = {Even the shortest flight through unknown, cluttered environments requires reliable local path planning algorithms to avoid unforeseen obstacles. The algorithm must evaluate alternative flight paths and identify the best path if an obstacle blocks its way. Commonly, weighted sums are used here. This work shows that weighted Chebyshev distances and factorial achievement scalarising functions are suitable alternatives to weighted sums if combined with the 3DVFH* local path planning algorithm. Both methods considerably reduce the failure probability of simulated flights in various environments. The standard 3DVFH* uses a weighted sum and has a failure probability of 50\% in the test environments. A factorial achievement scalarising function, which minimises the worst combination of two out of four objective functions, reaches a failure probability of 26\%; A weighted Chebyshev distance, which optimises the worst objective, has a failure probability of 30\%. These results show promise for further enhancements and to support broader applicability.}, language = {en} } @techreport{ReimerWellmerBraunetal.2007, author = {Reimer, Lars and Wellmer, Georg and Braun, Carsten and Ballmann, Josef}, title = {Aerodynamische Simulation und Optimierung in der Flugzeugentwicklung. Teilvorhabenbezeichnung: Aerodynamische Optimierung unter Ber{\"u}cksichtigung von Struktureigenschaften auf der Basis reduzierter Strukturmodelle, Verbundvorhaben MEGADESIGN. Schlussbericht. Berichtszeitraum: 01.06.2003-31.05.2007. BMBF-Forschungsbericht}, pages = {41 S.: Ill., graph. Darst.}, year = {2007}, language = {de} } @article{KochBoehnischVerdoncketal.2024, author = {Koch, Christopher and B{\"o}hnisch, Nils and Verdonck, Hendrik and Hach, Oliver and Braun, Carsten}, title = {Comparison of unsteady low- and mid-fidelity propeller aerodynamic methods for whirl flutter applications}, series = {Applied Sciences}, volume = {14}, journal = {Applied Sciences}, number = {2}, publisher = {MDPI}, address = {Basel}, issn = {2076-3417}, doi = {10.3390/app14020850}, pages = {1 -- 28}, year = {2024}, abstract = {Aircraft configurations with propellers have been drawing more attention in recent times, partly due to new propulsion concepts based on hydrogen fuel cells and electric motors. These configurations are prone to whirl flutter, which is an aeroelastic instability affecting airframes with elastically supported propellers. It commonly needs to be mitigated already during the design phase of such configurations, requiring, among other things, unsteady aerodynamic transfer functions for the propeller. However, no comprehensive assessment of unsteady propeller aerodynamics for aeroelastic analysis is available in the literature. This paper provides a detailed comparison of nine different low- to mid-fidelity aerodynamic methods, demonstrating their impact on linear, unsteady aerodynamics, as well as whirl flutter stability prediction. Quasi-steady and unsteady methods for blade lift with or without coupling to blade element momentum theory are evaluated and compared to mid-fidelity potential flow solvers (UPM and DUST) and classical, derivative-based methods. Time-domain identification of frequency-domain transfer functions for the unsteady propeller hub loads is used to compare the different methods. Predictions of the minimum required pylon stiffness for stability show good agreement among the mid-fidelity methods. The differences in the stability predictions for the low-fidelity methods are higher. Most methods studied yield a more unstable system than classical, derivative-based whirl flutter analysis, indicating that the use of more sophisticated aerodynamic modeling techniques might be required for accurate whirl flutter prediction.}, language = {en} }