@inproceedings{ThomaStiemerBraunetal.2023, author = {Thoma, Andreas and Stiemer, Luc and Braun, Carsten and Fisher, Alex and Gardi, Alessandro G.}, title = {Potential of hybrid neural network local path planner for small UAV in urban environments}, series = {AIAA SCITECH 2023 Forum}, booktitle = {AIAA SCITECH 2023 Forum}, publisher = {AIAA}, doi = {10.2514/6.2023-2359}, pages = {13 Seiten}, year = {2023}, abstract = {This work proposes a hybrid algorithm combining an Artificial Neural Network (ANN) with a conventional local path planner to navigate UAVs efficiently in various unknown urban environments. The proposed method of a Hybrid Artificial Neural Network Avoidance System is called HANNAS. The ANN analyses a video stream and classifies the current environment. This information about the current Environment is used to set several control parameters of a conventional local path planner, the 3DVFH*. The local path planner then plans the path toward a specific goal point based on distance data from a depth camera. We trained and tested a state-of-the-art image segmentation algorithm, PP-LiteSeg. The proposed HANNAS method reaches a failure probability of 17\%, which is less than half the failure probability of the baseline and around half the failure probability of an improved, bio-inspired version of the 3DVFH*. The proposed HANNAS method does not show any disadvantages regarding flight time or flight distance.}, language = {en} } @article{DachwaldSeboldtMacdonaldetal.2005, author = {Dachwald, Bernd and Seboldt, Wolfgang and Macdonald, Malcolm and Mengali, Giovanni and Quatra, Alessandro A. and McInnes, Colin R. and Rios-Reyes, Leonel and Scheerers, Daniel J. and Wie, Bong and G{\"o}rlich, Marianne and Lura, Franz and Diedrich, Benjamin and Baturkin, Volodymyr and Coverstone, Victoria L. and Leipold, Manfred and Garbe, Gregory P.}, title = {Potential Solar Sail Degradation Effects on Trajectory and Attitude Control}, series = {AIAA Guidance, Navigation and Control Conference and Exhibit - AIAA Modeling and Simulation Technologies Conference and Exhibit - AIAA Atmospheric Flight Mechanics Conference and Exhibit : [San Francisco, California, 15 - 18 August 2005 ; papers]. - (AIAA meeting papers on disc ; [10.]2005,16-17)}, journal = {AIAA Guidance, Navigation and Control Conference and Exhibit - AIAA Modeling and Simulation Technologies Conference and Exhibit - AIAA Atmospheric Flight Mechanics Conference and Exhibit : [San Francisco, California, 15 - 18 August 2005 ; papers]. - (AIAA meeting papers on disc ; [10.]2005,16-17)}, publisher = {American Institute of Aeronautics and Astronautics}, address = {Reston, Va.}, isbn = {1-56347-765-3}, pages = {2 CD-ROMs}, year = {2005}, language = {en} } @article{FunkeEschRoosen2022, author = {Funke, Harald and Esch, Thomas and Roosen, Petra}, title = {Powertrain Adaptions for LPG Usage in General Aviation}, series = {MTZ worldwide}, volume = {2022}, journal = {MTZ worldwide}, number = {83}, publisher = {Springer Nature}, address = {Basel}, doi = {10.1007/s38313-021-0756-6}, pages = {58 -- 62}, year = {2022}, abstract = {In general aviation, too, it is desirable to be able to operate existing internal combustion engines with fuels that produce less CO₂ than Avgas 100LL being widely used today It can be assumed that, in comparison, the fuels CNG, LPG or LNG, which are gaseous under normal conditions, produce significantly lower emissions. Necessary propulsion system adaptations were investigated as part of a research project at Aachen University of Applied Sciences.}, language = {en} } @inproceedings{HilleStumpfMayntzetal.2023, author = {Hille, Sebastian and Stumpf, Eike and Mayntz, Joscha and Dahmann, Peter}, title = {Prediction of sound exposure caused by a landing motor glider with recuperating propellers}, series = {AIAA SCITECH 2023 Forum}, booktitle = {AIAA SCITECH 2023 Forum}, publisher = {AIAA}, doi = {10.2514/6.2023-0211}, year = {2023}, abstract = {This paper presents an approach to predicting the sound exposure on the ground caused by a landing aircraft with recuperating propellers. The noise source along the trajectory of a flight specified for a steeper approach is simulated based on measurements of sound power levels and additional parameters of a single propeller placed in a wind tunnel. To validate the measured data/measurement results, these simulations are also supported by overflight measurements of a test aircraft. It is shown that the simple source models of propellers do not provide fully satisfactory results since the sound levels are estimated too low. Nevertheless, with a further reference comparison, margins for an acceptable increase in the sound power level of the aircraft on its now steeper approach path could be estimated. Thus, in this case, a +7 dB increase in SWL would not increase the SEL compared to the conventional approach within only 2 km ahead of the airfield.}, language = {en} } @incollection{BraunBouckeHankeetal.2003, author = {Braun, Carsten and Boucke, Alexander and Hanke, M. and Karavas, Alexandros and Ballmann, Josef}, title = {Prediction of the model deformation of a high speed transport aircraft type wing by direct aeroelastic simulation}, series = {High performance computing in science and engineering '03. Transactions of the High Performance Computing Center Stuttgart (HLRS) 2003 / Eds.: Egon Krause ...}, booktitle = {High performance computing in science and engineering '03. Transactions of the High Performance Computing Center Stuttgart (HLRS) 2003 / Eds.: Egon Krause ...}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-540-40850-5}, pages = {331 -- 342}, year = {2003}, language = {de} } @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{PeloniCeriottiDachwald2015, author = {Peloni, A. and Ceriotti, M. and Dachwald, Bernd}, title = {Preliminary trajectory design of a multiple NEO rendezvous mission through solar sailing}, series = {Proceedings of the International Astronautical Congress, IAC, Vol. 8, 2014}, booktitle = {Proceedings of the International Astronautical Congress, IAC, Vol. 8, 2014}, publisher = {Curran}, address = {Red Hook, NY}, isbn = {978-1-63439-986-9}, pages = {5352 -- 5366}, year = {2015}, language = {en} } @inproceedings{PeekenTroederSchmidtetal.1985, author = {Peeken, Heinz and Troeder, Christoph and Schmidt, J. and Rosenkranz, Josef}, title = {Principles of machine noise reduction}, series = {Inter-noise 85 : proceedings ; 1985 international conference on noise control engineering ; Munich, Sept. 18 - 20, 1985. - (Schriftenreihe der Bundesanstalt f{\"u}r Arbeitsschutz : Tagungsbericht ; 39)}, booktitle = {Inter-noise 85 : proceedings ; 1985 international conference on noise control engineering ; Munich, Sept. 18 - 20, 1985. - (Schriftenreihe der Bundesanstalt f{\"u}r Arbeitsschutz : Tagungsbericht ; 39)}, publisher = {Bundesanstalt f{\"u}r Arbeitsschutz [u.a.]}, address = {Dortmund [u.a.]}, isbn = {3-88314-417-7}, pages = {23 -- 36}, year = {1985}, 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} } @inproceedings{KnoblochKowalskiBoesigeretal.2011, author = {Knobloch, V. and Kowalski, Julia and B{\"o}siger, P. and Kozerke, S.}, title = {Probabilistic Streamline Estimation from Accelerated Fourier Velocity Encoded Measurements}, series = {Proceedings of the 19th ISMRM International Society for Magnetic Resonance in Medicine}, booktitle = {Proceedings of the 19th ISMRM International Society for Magnetic Resonance in Medicine}, pages = {1215 -- 1215}, year = {2011}, language = {de} } @incollection{HeimesKampkerDornetal.2023, author = {Heimes, Heiner Hans and Kampker, Achim and Dorn, Benjamin and Kehrer, Mario and D{\"u}nnwald, Simon and Badura, Dennis and Terren, Maximilian and R{\"o}th, Thilo}, title = {Produktionsprozesse der Fahrzeugstruktur}, series = {Elektromobilit{\"a}t: Grundlagen einer Fortschrittstechnologie}, booktitle = {Elektromobilit{\"a}t: Grundlagen einer Fortschrittstechnologie}, editor = {Kampker, Achim and Heimes, Heiner Hans}, publisher = {Springer Vieweg}, address = {Berlin}, isbn = {978-3-662-65811-6 (Print)}, doi = {10.1007/978-3-662-65812-3_13}, pages = {227 -- 247}, year = {2023}, language = {de} } @article{HavermannSeilerGeorgesetal.2008, author = {Havermann, Marc and Seiler, F. and Georges, A. and Srulijes, J.}, title = {Progress in Doppler picture velocimetry (DPV) / Seiler, F. ; George, A. ; Srulijes, J. ; Havermann, M.}, series = {Experiments in Fluids. 44 (2008), H. 3}, journal = {Experiments in Fluids. 44 (2008), H. 3}, publisher = {-}, isbn = {1432-1114}, pages = {389 -- 395}, year = {2008}, language = {en} } @book{HavermannSeilerGeorgeetal.2006, author = {Havermann, Marc and Seiler, F. and George, A. and Srulijes, J.}, title = {Progress in doppler picture velocimetry (DPV) technique : 12th International Symposium on Flow Visualization, DLR, G{\"o}ttingen, September 10 - 14, 2006 / Institut Franco-Allemand de Recherches de Saint-Louis. Seiler, F. ...}, publisher = {ISL}, address = {Saint-Louis}, pages = {10 S. : Ill., graph. Darst.}, year = {2006}, language = {en} } @inproceedings{SeboldtBlomeDachwaldetal.2004, author = {Seboldt, Wolfgang and Blome, Hans-Joachim and Dachwald, Bernd and Richter, Lutz}, title = {Proposal for an integrated European space exploration strategy}, series = {55th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law}, booktitle = {55th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law}, pages = {1 -- 10}, year = {2004}, abstract = {Recently, in his vision for space exploration, US president Bush announced to extend human presence across the solar system, starting with a human return to the Moon as early as 2015 in preparation for human exploration of Mars and other destinations. In Europe, an exploration program, termed AURORA, was established by ESA in 2001 - funded on a voluntary basis by ESA member states - with a clear focus on Mars and the ultimate goal of landing humans on Mars around 2030 in international cooperation. In 2003, a Human Spaceflight Vision Group was appointed by ESA with the task to develop a vision for the role of human spaceflight during the next quarter of the century. The resulting vision focused on a European-led lunar exploration initiative as part of a multi-decade, international effort to strengthen European identity and economy. After a review of the situation in Europe concerning space exploration, the paper outlines an approach for a consistent positioning of exploration within the existing European space programs, identifies destinations, and develops corresponding scenarios for an integrated strategy, starting with robotic missions to the Moon, Mars, and near-Earth asteroids. The interests of the European planetary in-situ science community, which recently met at DLR Cologne, are considered. Potential robotic lunar missions comprise polar landings to search for frozen volatiles and a sample return. For Mars, the implementation of a modest robotic landing mission in 2009 to demonstrate the capability for landing and prepare more ambitious and complex missions is discussed. For near-Earth asteroid exploration, a low-cost in-situ technology demonstration mission could yield important results. All proposed scenarios offer excellent science and could therefore create synergies between ESA's mandatory and optional programs in the area of planetary science and exploration. The paper intents to stimulate the European discussion on space exploration and reflects the personal view of the authors.}, language = {en} } @article{BlomeSeboldtDachwaldetal.2004, author = {Blome, Hans-Joachim and Seboldt, Wolfgang and Dachwald, Bernd and Richter, Lutz}, title = {Proposal for an integrated European Space Exploration Study}, series = {Space Debris and Space Traffic Management Symposium 2004 : proceedings of the International Academy of Astronautics Space Debris and Space Traffic Management Symposium, held in conjunction with the 55th International Astronautical Congress (IAC), October 4 - 8, 2004, Vancouver, British Columbia, Canada / ed. by Joerg Bendisch}, journal = {Space Debris and Space Traffic Management Symposium 2004 : proceedings of the International Academy of Astronautics Space Debris and Space Traffic Management Symposium, held in conjunction with the 55th International Astronautical Congress (IAC), October 4 - 8, 2004, Vancouver, British Columbia, Canada / ed. by Joerg Bendisch}, publisher = {Univelt}, address = {San Diego, Calif.}, isbn = {0-87703-523-7}, pages = {XI, 432 S. : Ill., graph. Darst.}, year = {2004}, language = {en} } @inproceedings{HippeFingerGoettenetal.2020, author = {Hippe, Jonas and Finger, Felix and G{\"o}tten, Falk and Braun, Carsten}, title = {Propulsion System Qualification of a 25 kg VTOL-UAV: Hover Performance of Single and Coaxial Rotors and Wind-Tunnel Experiments on Cruise Propellers}, series = {Deutscher Luft- und Raumfahrtkongress - DLRK 2020}, booktitle = {Deutscher Luft- und Raumfahrtkongress - DLRK 2020}, year = {2020}, language = {en} } @inproceedings{SchopenShabaniEschetal.2022, author = {Schopen, Oliver and Shabani, Bahman and Esch, Thomas and Kemper, Hans and Shah, Neel}, title = {Quantitative evaluation of health management designs for fuel cell systems in transport vehicles}, series = {2nd UNITED-SAIG International Conference Proceedings}, booktitle = {2nd UNITED-SAIG International Conference Proceedings}, editor = {Rahim, S.A. and As'arry, A. and Zuhri, M.Y.M. and Harmin, M.Y. and Rezali, K.A.M. and Hairuddin, A.A.}, pages = {1 -- 3}, year = {2022}, abstract = {Focusing on transport vehicles, mainly with regard to aviation applications, this paper presents compilation and subsequent quantitative evaluation of methods aimed at building an optimum integrated health management solution for fuel cell systems. The methods are divided into two different main types and compiled in a related scheme. Furthermore, different methods are analysed and evaluated based on parameters specific to the aviation context of this study. Finally, the most suitable method for use in fuel cell health management systems is identified and its performance and suitability is quantified.}, language = {en} } @article{BlomeMashhoon1984, author = {Blome, Hans-Joachim and Mashhoon, B.}, title = {Quasi-normal oscillations of a Schwarzschild black hole}, series = {Physics Letters A. 100 (1984), H. 5}, journal = {Physics Letters A. 100 (1984), H. 5}, isbn = {0375-9601}, pages = {231 -- 234}, year = {1984}, language = {en} } @inproceedings{Dachwald2017, author = {Dachwald, Bernd}, title = {Radiation pressure force model for an ideal laser-enhanced solar sail}, series = {4th International Symposium on Solar Sailing}, booktitle = {4th International Symposium on Solar Sailing}, pages = {1 -- 5}, year = {2017}, abstract = {The concept of a laser-enhanced solar sail is introduced and the radiation pressure force model for an ideal laser-enhanced solar sail is derived. A laser-enhanced solar sail is a "traditional" solar sail that is, however, not solely propelled by solar radiation, but additionally by a laser beam that illuminates the sail. The additional laser radiation pressure increases the sail's propulsive force and can give, depending on the location of the laser source, more control authority over the direction of the solar sail's propulsive force vector. This way, laser-enhanced solar sails may augment already existing solar sail mission concepts and make novel mission concepts feasible.}, language = {en} } @article{ChristenKowalskiBartelt2010, author = {Christen, Marc and Kowalski, Julia and Bartelt, Perry}, title = {RAMMS: Numerical simulation of dense snow avalanches in three-dimensional terrain}, series = {Cold Regions Science and Technology}, volume = {63}, journal = {Cold Regions Science and Technology}, number = {1-2}, publisher = {Elsevier}, address = {Amsterdam}, issn = {1872-7441}, doi = {10.1016/j.coldregions.2010.04.005}, pages = {1 -- 14}, year = {2010}, abstract = {Numerical avalanche dynamics models have become an essential part of snow engineering. Coupled with field observations and historical records, they are especially helpful in understanding avalanche flow in complex terrain. However, their application poses several new challenges to avalanche engineers. A detailed understanding of the avalanche phenomena is required to construct hazard scenarios which involve the careful specification of initial conditions (release zone location and dimensions) and definition of appropriate friction parameters. The interpretation of simulation results requires an understanding of the numerical solution schemes and easy to use visualization tools. We discuss these problems by presenting the computer model RAMMS, which was specially designed by the SLF as a practical tool for avalanche engineers. RAMMS solves the depth-averaged equations governing avalanche flow with accurate second-order numerical solution schemes. The model allows the specification of multiple release zones in three-dimensional terrain. Snow cover entrainment is considered. Furthermore, two different flow rheologies can be applied: the standard Voellmy-Salm (VS) approach or a random kinetic energy (RKE) model, which accounts for the random motion and inelastic interaction between snow granules. We present the governing differential equations, highlight some of the input and output features of RAMMS and then apply the models with entrainment to simulate two well-documented avalanche events recorded at the Vall{\´e}e de la Sionne test site.}, language = {en} } @article{GoettenHavermannBraunetal.2019, author = {G{\"o}tten, Falk and Havermann, Marc and Braun, Carsten and Gomez, Francisco and Bil, Cees}, title = {RANS Simulation Validation of a Small Sensor Turret for UAVs}, series = {Journal of Aerospace Engineering}, volume = {32}, journal = {Journal of Aerospace Engineering}, number = {5}, publisher = {ASCE}, address = {New York}, issn = {1943-5525}, doi = {10.1061/(ASCE)AS.1943-5525.0001055}, pages = {Article number 04019060}, year = {2019}, abstract = {Recent Unmanned Aerial Vehicle (UAV) design procedures rely on full aircraft steady-state Reynolds-Averaged-Navier-Stokes (RANS) analyses in early design stages. Small sensor turrets are included in such simulations, even though their aerodynamic properties show highly unsteady behavior. Very little is known about the effects of this approach on the simulation outcomes of small turrets. Therefore, the flow around a model turret at a Reynolds number of 47,400 is simulated with a steady-state RANS approach and compared to experimental data. Lift, drag, and surface pressure show good agreement with the experiment. The RANS model predicts the separation location too far downstream and shows a larger recirculation region aft of the body. Both characteristic arch and horseshoe vortex structures are visualized and qualitatively match the ones found by the experiment. The Reynolds number dependence of the drag coefficient follows the trend of a sphere within a distinct range. The outcomes indicate that a steady-state RANS model of a small sensor turret is able to give results that are useful for UAV engineering purposes but might not be suited for detailed insight into flow properties.}, language = {en} } @article{GerhardtKramer1992, author = {Gerhardt, Hans Joachim and Kramer, C.}, title = {Rauch- und W{\"a}rmeabzug - physikalische Grundlagen und Anwendungen}, series = {vfdb-Zeitschrift. 41 (1992), H. 2}, journal = {vfdb-Zeitschrift. 41 (1992), H. 2}, isbn = {0042-1804}, pages = {49 -- 54}, year = {1992}, language = {de} } @article{GerhardtKonrath2003, author = {Gerhardt, Hans Joachim and Konrath, Bernd}, title = {Rauchableitung in unterirdischen Verkehrsanlagen. M{\"o}glichkeiten und Hinweise zur Ausf{\"u}hrung.}, series = {vfdb-Zeitschrift. 52 (2003), H. 2}, journal = {vfdb-Zeitschrift. 52 (2003), H. 2}, isbn = {0042-1804}, pages = {59 -- 65}, year = {2003}, language = {de} } @article{Gerhardt2003, author = {Gerhardt, Hans Joachim}, title = {Rauchableitung und deren Effektivit{\"a}t in der 4. Elbtunnelr{\"o}hre}, series = {tunnel - Internationale Fachzeitschrift f{\"u}r unterirdisches Bauen (2003)}, journal = {tunnel - Internationale Fachzeitschrift f{\"u}r unterirdisches Bauen (2003)}, isbn = {0722-6241}, pages = {19 -- 28}, year = {2003}, language = {de} } @article{GerhardtSchmidtJung2002, author = {Gerhardt, Hans Joachim and Schmidt, G. and Jung, G.}, title = {Rauchversuch in einem Hochregallager}, series = {Bautechnik. 79 (2002), H. 6}, journal = {Bautechnik. 79 (2002), H. 6}, isbn = {0932-8351}, pages = {414 -- 417}, year = {2002}, language = {de} } @article{GerhardtJungSchmidt2002, author = {Gerhardt, Hans Joachim and Jung, G. and Schmidt, G.}, title = {Rauchversuch in einem Hochregallager. Die aerodynamisch wirksame {\"O}ffnungsfl{\"a}che f{\"u}r den Rauchabzug in Hochregallagern und ihr Einfluss auf die L{\"o}scharbeiten der Feuerwehr}, series = {vfdb-Zeitschrift. 51 (2002), H. 1}, journal = {vfdb-Zeitschrift. 51 (2002), H. 1}, isbn = {0042-1804}, pages = {21 -- 25}, year = {2002}, language = {de} } @article{Blome2000, author = {Blome, Hans-Joachim}, title = {Raumfahrt - zwischen Himmel und Erde}, series = {Technologien f{\"u}r das 21. Jahrhundert / [red. Leitung: Birgit Strackenbrock ...]}, journal = {Technologien f{\"u}r das 21. Jahrhundert / [red. Leitung: Birgit Strackenbrock ...]}, publisher = {Brockhaus}, address = {Leipzig [u.a.]}, isbn = {376537945X}, pages = {572 -- 679}, year = {2000}, language = {de} } @article{Blome2001, author = {Blome, Hans-Joachim}, title = {Raumfahrt und Exploration des Kosmos}, series = {Mensch, Leben, Schwerkraft, Kosmos : Perspektiven biowissenschaftlicher Weltraumforschung in Deutschland ; Berichtsband einer Klausurtagung vom 20. - 22.10.2000 in Stuttgart-Hohenheim/Birkach / Hinrich Rahmann ... (Hrsg.). [Ausgerichtet von der Deutschen Gesellschaft f{\"u}r Luft- und Raumfahrt medizin]}, journal = {Mensch, Leben, Schwerkraft, Kosmos : Perspektiven biowissenschaftlicher Weltraumforschung in Deutschland ; Berichtsband einer Klausurtagung vom 20. - 22.10.2000 in Stuttgart-Hohenheim/Birkach / Hinrich Rahmann ... (Hrsg.). [Ausgerichtet von der Deutschen Gesellschaft f{\"u}r Luft- und Raumfahrt medizin]}, publisher = {Heimbach}, address = {Stuttgart}, isbn = {3-935380-03-8}, pages = {80 -- 105}, year = {2001}, language = {de} } @book{Esch2005, author = {Esch, Thomas}, title = {Raumfahrtantriebe. - 6. Aufl., [Umdruck]}, publisher = {Fachhochschule Aachen, Lehr- und Forschungsgebiet Thermodynamik und Verbrennungstechnik}, address = {Aachen}, pages = {Getr. Z{\"a}hlung : Ill., graph. Darst.}, year = {2005}, 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} } @book{Ley1997, author = {Ley, Wilfried}, title = {Raumfahrtmissionen zur Erkundung des Sonnensystems : Gemeinschaftsveranstaltung der FH Aachen, der DGLR und des DLR / 10. Raumfahrt-Kolloquium an der Fachhochschule Aachen, 5. November 1997 / Ley, Wilfried [Hrsg.]}, publisher = {DGLR}, address = {Bonn}, isbn = {3-922010-99-7}, pages = {VIII, 251 S. : Ill., graph. Darst., 30 cm}, year = {1997}, language = {de} } @book{Ley1999, author = {Ley, Wilfried}, title = {Raumflugbetrieb : Gemeinschaftsveranstaltung der FH Aachen, der DGLR und der DLR / 12. Raumfahrt-Kolloquium an der Fachhochschule Aachen, 11. November 1999. / Ley Wilfried [Hrsg.]}, publisher = {DGLR}, address = {Bonn}, isbn = {3-932182-07-03}, pages = {VIII, 215 S. : zahlr. Ill., graph. Darst.}, year = {1999}, language = {de} } @article{Bullerschen1990, author = {Bullerschen, Klaus-Gerd}, title = {Rechenmodelle zur Stromverdr{\"a}ngung in ein- und mehrphasigen elektrischen Leitungen komplexer Geometrie}, series = {Elektrow{\"a}rme International, Edition B (Industrielle Elektrow{\"a}rme). 48 (1990), H. 4}, journal = {Elektrow{\"a}rme International, Edition B (Industrielle Elektrow{\"a}rme). 48 (1990), H. 4}, isbn = {0340-3521}, pages = {199 -- 210}, year = {1990}, language = {de} } @incollection{Mertens1997, author = {Mertens, Josef}, title = {Reduction of aerodynamic drag (RaWid)-Status after the first year of the program}, series = {New results in numerical and experimental fluid mechanics. - (Notes on numerical fluid mechanics ; 60)}, booktitle = {New results in numerical and experimental fluid mechanics. - (Notes on numerical fluid mechanics ; 60)}, publisher = {Vieweg}, address = {Braunschweig [u.a.]}, isbn = {3-528-06960-0}, doi = {10.1007/978-3-322-86573-1_2}, pages = {7 -- 14}, year = {1997}, abstract = {The technology programme "Reduction of aerodynamic drag (RaWid)" for high speed aerodynamics at Daimler-Benz Aerospace Airbus is sponsered by the German ministry for education, research and technology since July 1, 1995. Connected to this industrial programme are the cooperation programmes "MEGAFLOW" under leadership of the DLR and "Transition" by the DFG, and several contributions by DLR and universities. The programme is oriented towards technologies required for a MEGALINER which gains momentum by the ambitious plans for a new large Airbus A3XX. In the first year new technological steps were undertaken in theory, design and experiment. Some critical steps were verified by wing designs checked in wind tunnel tests.}, language = {en} } @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} } @article{DachwaldMengaliQuartaetal.2007, author = {Dachwald, Bernd and Mengali, Giovanni and Quarta, Alessandro A. and Circi, Christian}, title = {Refined Solar Sail Force Model with Mission Application / Giovanni Mengali ; Alessandro A. Quarta , Christian Circi ; Bernd Dachwald}, series = {Journal of Guidance, Control, and Dynamics. 30 (2007), H. 2}, journal = {Journal of Guidance, Control, and Dynamics. 30 (2007), H. 2}, isbn = {0162-3192}, pages = {512 -- 520}, year = {2007}, language = {en} } @incollection{Mertens1997, author = {Mertens, Josef}, title = {Required aerodynamic technologies}, series = {New design concepts for high speed air transport. - (Courses and lectures / International Centre for Mechanical Sciences ; 366)}, booktitle = {New design concepts for high speed air transport. - (Courses and lectures / International Centre for Mechanical Sciences ; 366)}, editor = {Sobieczky, H.}, publisher = {Springer}, address = {Wien [u.a.]}, isbn = {3-2118-2815-X}, doi = {10.1007/978-3-7091-2658-5_5}, pages = {69 -- 96}, year = {1997}, abstract = {In the preceeding chapters on "Son of Concorde, a Technology Challenge" and "Aerodynamic Multipoint Design Challenge" it was explained, that a well balanced contribution of new technologies in all major disciplines is required for realisation of a new Supersonic Commercial Transport (SCT). One of these technologies - usually one of the most important for aircraft-is aerodynamics. Here, the required "pure" aerodynamic technologies are specified in more detail, according to our present knowledge. Increasing insight into the problems may change the balance of importance of the individual technologies and may require some more contributions. We must never confine our knowledge to the knowledge base of an expert at a given time, but must stay open for new insights.}, language = {en} } @article{Mertens1998, author = {Mertens, Josef}, title = {Required technologies for supersonic aircraft}, series = {Fluid dynamics research on supersonic aircraft : this report is a compilation of the edited proceedings of the special course on "Fluid dynamic research on supersonic aircraft" held at the Karman Institute for Fluid Dynamics (VKI) in Rhode-Saint-Genese, Belgium, 25-29 May 1998}, journal = {Fluid dynamics research on supersonic aircraft : this report is a compilation of the edited proceedings of the special course on "Fluid dynamic research on supersonic aircraft" held at the Karman Institute for Fluid Dynamics (VKI) in Rhode-Saint-Genese, Belgium, 25-29 May 1998}, publisher = {Research and Technology Organization}, address = {Neuilly-sur-Seine}, isbn = {92-837-1007-X}, pages = {5.1 -- 5.16}, year = {1998}, language = {en} } @inproceedings{GrundmannBauerBodenetal.2019, author = {Grundmann, Jan Thimo and Bauer, Waldemar and Boden, Ralf Christian and Ceriotti, Matteo and Cordero, Federico and Dachwald, Bernd and Dumont, Etienne and Grimm, Christian D. and Hercik, D. and Herique, A. and Ho, Tra-Mi and Jahnke, Rico and Kofman, Wlodek and Lange, Caroline and Lichtenheldt, Roy and McInnes, Colin R. and Mikschl, Tobias and Montenegro, Sergio and Moore, Iain and Pelivan, Ivanka and Peloni, Alessandro and Plettenmeier, 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 Toth, Norbert and Viavattene, Giulia and Wejmo, Elisabet and Wolff, Friederike and Ziach, Christian}, title = {Responsive exploration and asteroid characterization through integrated solar sail and lander development using small spacecraft technologies}, series = {IAA Planetary Defense Conference}, booktitle = {IAA Planetary Defense Conference}, year = {2019}, abstract = {In parallel to the evolution of the Planetary Defense Conference, the exploration of small solar system bodies has advanced from fast fly-bys on the sidelines of missions to the planets to the implementation of dedicated sample-return and in-situ analysis missions. Spacecraft of all sizes have landed, touch-and-go sampled, been gently beached, or impacted at hypervelocity on asteroid and comet surfaces. More have flown by close enough to image their surfaces in detail or sample their immediate environment, often as part of an extended or re-purposed mission. And finally, full-scale planetary defense experiment missions are in the making. Highly efficient low-thrust propulsion is increasingly applied beyond commercial use also in mainstream and flagship science missions, in combination with gravity assist propulsion. Another development in the same years is the growth of small spacecraft solutions, not in size but in numbers and individual capabilities. The on-going NASA OSIRIS-REx and JAXA HAYABUSA2 missions exemplify the trend as well as the upcoming NEA SCOUT mission or the landers MINERVA-II and MASCOT recently deployed on Ryugu. We outline likely as well as possible and efficient routes of continuation of all these developments towards a propellant-less and highly efficient class of spacecraft for small solar system body exploration: small spacecraft solar sails designed for carefree handling and equipped with carried landers and application modules, for all asteroid user communities -planetary science, planetary defence, and in-situ resource utilization. This projection builds on the experience gained in the development of deployable membrane structures leading up to the successful ground deployment test of a (20 m)² solar sail at DLR Cologne and in the 20 years since. It draws on the background of extensive trajectory optimization studies, the qualified technology of the DLR GOSSAMER-1 deployment demonstrator, and the MASCOT asteroid lander. These enable 'now-term' as well as near-term hardware solutions, and thus responsive fast-paced development. Mission types directly applicable to planetary defense include: single and Multiple NEA Rendezvous ((M)NR) for mitigation precursor, target monitoring and deflection follow-up tasks; sail-propelled head-on retrograde kinetic impactors (RKI) for mitigation; and deployable membrane based methods to modify the asteroid's properties or interact with it. The DLR-ESTEC GOSSAMER Roadmap initiated studies of missions uniquely feasible with solar sails such as Displaced L1 (DL1) space weather advance warning and monitoring and Solar Polar Orbiter (SPO) delivery which demonstrate the capability of near-term solar sails to achieve NEA rendezvous in any kind of orbit, from Earth-coorbital to extremely inclined and even retrograde orbits. For those mission types using separable payloads, such as SPO, (M)NR and RKI, design concepts can be derived from the separable Boom Sail Deployment Units characteristic of DLR GOSSAMER solar sail technology, nanolanders like MASCOT, or microlanders like the JAXA-DLR Jupiter Trojan Asteroid Lander for the OKEANOS mission which can shuttle from the sail to the asteroids visited and enable multiple NEA sample-return missions. These are an ideal match for solar sails in micro-spacecraft format whose launch configurations are compatible with ESPA and ASAP secondary payload platforms.}, language = {en} } @inproceedings{GrundmannBauerBodenetal.2019, author = {Grundmann, Jan Thimo and Bauer, Waldemar and Boden, Ralf Christian and Ceriotti, Matteo and Cordero, Federico and Dachwald, Bernd and Dumont, Etienne and Grimm, Christian D. and Hercik, D. and Herique, A. and Ho, Tra-Mi and Jahnke, Rico and Kofman, Wlodek and Lange, Caroline and Lichtenheldt, Roy and McInnes, Colin R. 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 Toth, Norbert and Viavattene, Giulia and Wejmo, Elisabet and Wolff, Friederike and Ziach, Christian}, title = {Responsive integrated small spacecraft solar sail and payload design concepts and missions}, series = {Conference: 5th International Symposium on Solar Sailing (ISSS 2019)}, booktitle = {Conference: 5th International Symposium on Solar Sailing (ISSS 2019)}, year = {2019}, abstract = {Asteroid mining has the potential to greatly reduce the cost of in-space manufacturing, production of propellant for space transportation and consumables for crewed spacecraft, compared to launching the required resources from Earth's deep gravity well. This paper discusses the top-level mission architecture and trajectory design for these resource-return missions, comparing high-thrust trajectories with continuous low-thrust solar-sail trajectories. This work focuses on maximizing the economic Net Present Value, which takes the time-cost of finance into account and therefore balances the returned resource mass and mission duration. The different propulsion methods will then be compared in terms of maximum economic return, sets of attainable target asteroids, and mission flexibility. This paper provides one more step towards making commercial asteroid mining an economically viable reality by integrating trajectory design, propulsion technology and economic modelling.}, language = {en} } @article{SmithKotliarLammertynetal.2020, author = {Smith, Wayne and Kotliar, Konstantin and Lammertyn, Leandi and Ramoshaba, Nthai E. and Vilser, Walthard and Huisman, Hugo W. and Schutte, Aletta E.}, title = {Retinal vessel caliber and caliber responses in true normotensive black and white adults: The African-PREDICT study}, series = {Microvascular Research}, volume = {128}, journal = {Microvascular Research}, number = {Article 103937}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0026-2862}, doi = {10.1016/j.mvr.2019.103937}, year = {2020}, abstract = {Purpose Globally, a detrimental shift in cardiovascular disease risk factors and a higher mortality level are reported in some black populations. The retinal microvasculature provides early insight into the pathogenesis of systemic vascular diseases, but it is unclear whether retinal vessel calibers and acute retinal vessel functional responses differ between young healthy black and white adults. Methods We included 112 black and 143 white healthy normotensive adults (20-30 years). Retinal vessel calibers (central retinal artery and vein equivalent (CRAE and CRVE)) were calculated from retinal images and vessel caliber responses to flicker light induced provocation (FLIP) were determined. Additionally, ambulatory blood pressure (BP), anthropometry and blood samples were collected. Results The groups displayed similar 24 h BP profiles and anthropometry (all p > .24). Black participants demonstrated a smaller CRAE (158 ± 11 vs. 164 ± 11 MU, p < .001) compared to the white group, whereas CRVE was similar (p = .57). In response to FLIP, artery maximal dilation was greater in the black vs. white group (5.6 ± 2.1 vs. 3.3 ± 1.8\%; p < .001). Conclusions Already at a young age, healthy black adults showed narrower retinal arteries relative to the white population. Follow-up studies are underway to show if this will be related to increased risk for hypertension development. The reason for the larger vessel dilation responses to FLIP in the black population is unclear and warrants further investigation.}, language = {en} } @article{WittmannFeuerbacherUlamecetal.1999, author = {Wittmann, Klaus and Feuerbacher, B. and Ulamec, S. and Rosenbauer, H. (u.a.)}, title = {Rosetta Lander - In Situ Characterisation of a Comet Nucleus}, series = {Acta Astronautica. 45 (1999), H. 4-9}, journal = {Acta Astronautica. 45 (1999), H. 4-9}, isbn = {0094-5765}, pages = {389 -- 395}, year = {1999}, language = {en} } @article{WittmannUlamecFeuerbacheretal.1997, author = {Wittmann, Klaus and Ulamec, S. and Feuerbacher, B. and Rosenbauer, H. (u.a.)}, title = {Rosetta Lander - In Situ Investigation of a Cometary Nucleus}, series = {Lunar and Planetary Science. 28 (1997)}, journal = {Lunar and Planetary Science. 28 (1997)}, isbn = {0270-9511}, pages = {1461 -- 1462}, year = {1997}, language = {en} } @article{Gerhardt1999, author = {Gerhardt, Hans Joachim}, title = {RWA-Einbau in Geb{\"a}udew{\"a}nden}, series = {Brandschutz in {\"o}ffentlichen und privaten Geb{\"a}uden (1999)}, journal = {Brandschutz in {\"o}ffentlichen und privaten Geb{\"a}uden (1999)}, pages = {46 -- 48}, year = {1999}, language = {de} } @article{LasaiKolmWahleetal.2000, author = {Lasai, Sven and Kolm, Heiko and Wahle, Michael and Pohl, Reiner}, title = {Schwingungsanalyse von Subsystemen mit Hilfe der Simulation}, series = {Automobiltechnische Zeitschrift - ATZ}, volume = {102}, journal = {Automobiltechnische Zeitschrift - ATZ}, number = {4}, isbn = {0001-2785}, pages = {266 -- 270}, year = {2000}, language = {de} } @misc{BurlageHoeraufKlandtetal.1998, author = {Burlage, Thomas and H{\"o}rauf, Martin and Klandt, Michael and Wahle, Michael}, title = {Schwingungsd{\"a}mpfer : Offenlegungsschrift}, publisher = {Deutsches Patent- und Markenamt / Europ{\"a}isches Patentamt}, address = {M{\"u}nchen / Den Hague}, pages = {14 S. : graph. Darst.}, year = {1998}, language = {de} } @inproceedings{WaldmannVeraDachwaldetal.2018, author = {Waldmann, Christoph and Vera, Jean-Pierre de and Dachwald, Bernd and Strasdeit, Henry and Sohl, Frank and Hanff, Hendrik and Kowalski, Julia and Heinen, Dirk and Macht, Sabine and Bestmann, Ulf and Meckel, Sebastian and Hildebrandt, Marc and Funke, Oliver and Gehrt, Jan-J{\"o}ran}, title = {Search for life in ice-covered oceans and lakes beyond Earth}, series = {2018 IEEE/OES Autonomous Underwater Vehicle Workshop, Proceedings November 2018, Article number 8729761}, booktitle = {2018 IEEE/OES Autonomous Underwater Vehicle Workshop, Proceedings November 2018, Article number 8729761}, doi = {10.1109/AUV.2018.8729761}, year = {2018}, abstract = {The quest for life on other planets is closely connected with the search for water in liquid state. Recent discoveries of deep oceans on icy moons like Europa and Enceladus have spurred an intensive discussion about how these waters can be accessed. The challenge of this endeavor lies in the unforeseeable requirements on instrumental characteristics both with respect to the scientific and technical methods. The TRIPLE/nanoAUV initiative is aiming at developing a mission concept for exploring exo-oceans and demonstrating the achievements in an earth-analogue context, exploring the ocean under the ice shield of Antarctica and lakes like Dome-C on the Antarctic continent.}, language = {en} } @book{Ley1990, author = {Ley, Wilfried}, title = {Seilgefesselte Raumflugk{\"o}rper, -Tethertechnik- : Gemeinschaftsveranstaltung der FH Aachen und der DGLR ... / 3. Raumfahrt-Kolloquium an der Fachhochschule Aachen, 13. Dezember 1990. [Wiss. Programmleitung: W. Ley, W. Hallmann]}, publisher = {DGLR}, address = {Bonn}, isbn = {3-922010-59-8}, pages = {Getr. Z{\"a}hl. : graph. Darst.}, year = {1990}, language = {de} } @article{Finger2016, author = {Finger, Felix}, title = {Senkrechtstarter: FH-Absolvent wird f{\"u}r Transportdrohne ausgezeichnet}, series = {campushunter: das etwas andere Karrieremagazin - Wintersemester 16/17}, journal = {campushunter: das etwas andere Karrieremagazin - Wintersemester 16/17}, number = {17. Regionalausgabe Aachen}, publisher = {Campushunter Media}, address = {Heidelberg}, issn = {2196-9426}, pages = {116 -- 117}, year = {2016}, language = {de} }