@book{Koehler1990, author = {K{\"o}hler, Bernd}, title = {Werkstofftechnologie der Luft- und Raumfahrt. Teil 1 : Grundlagen. -2. Aufl.}, publisher = {Mainz}, address = {Aachen}, isbn = {3-89653-861-6}, pages = {183 S. : graph. Darst.}, year = {1990}, language = {de} } @book{Koehler1990, author = {K{\"o}hler, Bernd}, title = {Werkstofftechnologie der Luft- und Raumfahrt. Teil 2 : Leichtmetalle und St{\"a}hle}, publisher = {Mainz}, address = {Aachen}, isbn = {3-89653-862-4}, pages = {194 S. : graph. Darst.}, year = {1990}, language = {de} } @book{Koehler2001, author = {K{\"o}hler, Bernd}, title = {Werkstofftechnologie der Luft- und Raumfahrt. Teil 2 : Leichtmetalle und St{\"a}hle. - 2. Aufl.}, publisher = {Mainz}, address = {Aachen}, isbn = {3-89653-862-4}, pages = {194 S. : graph. Darst.}, year = {2001}, language = {de} } @inproceedings{LaoBuehrigPolaczekRoeth2011, author = {Lao, B. and B{\"u}hrig-Polaczek, A. and R{\"o}th, Thilo}, title = {Funktionsintegrierte Leichtbaustrukturen in gussintensiver Metall-Hybridbauweise}, series = {Verbundwerkstoffe und Werkstoffverbunde: Tagungsband zum 18. Symposium ; 30.03.2011 bis 01.04.2011, Chemnitz}, booktitle = {Verbundwerkstoffe und Werkstoffverbunde: Tagungsband zum 18. Symposium ; 30.03.2011 bis 01.04.2011, Chemnitz}, editor = {Wielage, Bernhard}, publisher = {Eigenverlag}, address = {Chemnitz}, isbn = {978-3-00-033801-4}, pages = {413 -- 421}, year = {2011}, 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} } @article{LeipoldFichtnerHeberetal.2006, author = {Leipold, M. and Fichtner, H. and Heber, B. and Groepper, P. and Lascar, S. and Burger, F. and Eiden, M. and Niederstadt, T. and Sickinger, C. and Herbeck, L. and Dachwald, Bernd and Seboldt, W.}, title = {Heliopause Explorer - A Sailcraft Mission to the Outer Boundaries of the Solar System}, series = {Acta Astronautica. 59 (2006), H. 8-11}, journal = {Acta Astronautica. 59 (2006), H. 8-11}, isbn = {0094-5765}, pages = {786 -- 796}, year = {2006}, language = {en} } @book{LemaitreBlome2010, author = {Lemaitre, George and Blome, Hans-Joachim}, title = {Von der klassischen Kosmologie zum Quantenkosmos}, editor = {Blome, Hans-Joachim}, publisher = {Deutsch}, address = {Frankfurt am Main}, isbn = {978-3-8171-3304-8}, pages = {240 S.}, year = {2010}, language = {de} } @article{LettiniHavermannGuidettietal.2010, author = {Lettini, Antonio and Havermann, Marc and Guidetti, Marco and Fornaciari, Andrea}, title = {Improved functionalities and energy saving potential on mobile machines combining electronics with flow sharing valve and variable displacement pump}, series = {IFK 7, 7th International Fluid Power Conference, Efficiency through Fluid Power, 7. Internationales Fluidtechnisches Kolloquium, Workshop Proceedings, Vol. 3, Aachen, DE, 22.-24. Mar, 2010}, journal = {IFK 7, 7th International Fluid Power Conference, Efficiency through Fluid Power, 7. Internationales Fluidtechnisches Kolloquium, Workshop Proceedings, Vol. 3, Aachen, DE, 22.-24. Mar, 2010}, publisher = {-}, isbn = {978-3-940565-92-1}, pages = {103 -- 114}, year = {2010}, language = {en} } @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} } @book{Ley2000, author = {Ley, Wilfried}, title = {Meteoriten und Space Debris : Gemeinschaftsveranstaltung der FH Aachen, der DGLR und der DLR / 13. Raumfahrt-Kolloquium an der Fachhochschule Aachen, 23. November 2000. / Ley, Wilfried [Hrsg.]}, publisher = {DGLR}, address = {Bonn}, isbn = {3-932182-14-6}, pages = {VIII, 296 S. : zahlr. Ill., graph. Darst.}, year = {2000}, language = {de} } @book{Ley1998, author = {Ley, Wilfried}, title = {Internationale Raumstation : Konfiguration, Betrieb und Nutzung ; Gemeinschaftsveranstaltung der FH Aachen, der DGLR und des DLR / 11. Raumfahrt-Kolloquium an der Fachhochschule Aachen, 26. November 1998. / Ley, Wilfried [Hrsg.]}, publisher = {DGLR}, address = {Bonn}, isbn = {3-932182-04-9}, pages = {VIII, 208 S. : Ill., graph. Darst., 30 cm}, year = {1998}, 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{Ley1995, author = {Ley, Wilfried}, title = {Tr{\"a}gersysteme : Gemeinschaftsveranstaltung der FH Aachen und der DGLR / 8. Raumfahrt-Kolloquium an der Fachhochschule Aachen, 9. November 1995 / Ley, Wilfried [Hrgs.]}, publisher = {DGLR}, address = {Bonn}, isbn = {3-922010-92-X}, pages = {VII, 245 S. : Ill., graph. Darst.}, year = {1995}, language = {de} } @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} } @book{Ley1982, author = {Ley, Wilfried}, title = {Bewertung von Solarkollektormessungen unter natuerlichen und simulierten Bedingungen}, publisher = {Inst. f. Raumsimulation}, address = {K{\"o}ln}, pages = {190 Seiten, 133 Bilder, 19 Tabellen, 43 Quellen}, year = {1982}, language = {de} } @book{Ley1988, author = {Ley, Wilfried}, title = {Handbuch der Raumfahrttechnik : Grundlagen - Nutzung, Raumfahrtsysteme - Produktsicherung u. Produktmanagement / Willi Hallmann; Wilfried Ley}, publisher = {Hanser}, address = {M{\"u}nchen [u.a.]}, isbn = {3446151303}, pages = {XVIII, 792 S : Ill., graph. Darst.}, year = {1988}, language = {de} } @book{Ley2008, author = {Ley, Wilfried}, title = {Handbuch der Raumfahrttechnik / Ley, Wilfried ; Wittmann, Klaus ; Hallmann, Willi [Hrsg.]}, publisher = {Hanser}, address = {M{\"u}nchen}, isbn = {978-3-446-41185-2}, pages = {814 S. : zahlr. Ill., graph. Darst.}, year = {2008}, language = {de} } @article{LeyPlescherScholzetal.2007, author = {Ley, Wilfried and Plescher, Engelbert and Scholz, Artur and Piepenbrock, Johannes}, title = {COMPASS-1 picosatellite project / Ley, Wilfried ; Plescher, Engelbert ; Scholz, Artur ; Piepenbrock, Johannes}, series = {Small satellites for earth observation : digest of the 6th International symposium of the International Academy of Astronautics, Berlin, April 23 - 26, 2007 / ed. by Rainer Sandau; Hans-Peter R{\"o}ser; Arnoldo Valenzuela}, journal = {Small satellites for earth observation : digest of the 6th International symposium of the International Academy of Astronautics, Berlin, April 23 - 26, 2007 / ed. by Rainer Sandau; Hans-Peter R{\"o}ser; Arnoldo Valenzuela}, publisher = {Wissenschaft und Technik Verl.}, address = {Berlin}, isbn = {9783896855718}, pages = {147 -- 150}, year = {2007}, language = {en} } @book{LeyWittmannHallmann2009, author = {Ley, Wilfried and Wittmann, Klaus and Hallmann, Willi}, title = {Handbook of space technology}, publisher = {Wiley}, address = {Chichester}, isbn = {978-0-470-69739-9}, pages = {XIII, 882 S. : Ill., graph. Darst.}, year = {2009}, language = {en} } @inproceedings{LoebSchartnerDachwaldetal.2011, author = {Loeb, Horst W. and Schartner, Karl-Heinz and Dachwald, Bernd and Ohndorf, Andreas and Seboldt, Wolfgang}, title = {An Interstellar - Heliopause mission using a combination of solar/radioisotope electric propulsion}, series = {Presented at the 32nd International Electric Propulsion Conference}, booktitle = {Presented at the 32nd International Electric Propulsion Conference}, pages = {1 -- 7}, year = {2011}, abstract = {There is common agreement within the scientific community that in order to understand our local galactic environment it will be necessary to send a spacecraft into the region beyond the solar wind termination shock. Considering distances of 200 AU for a new mission, one needs a spacecraft travelling at a speed of close to 10 AU/yr in order to keep the mission duration in the range of less than 25 yrs, a transfer time postulated by ESA.Two propulsion options for the mission have been proposed and discussed so far: the solar sail propulsion and the ballistic/radioisotope electric propulsion. As a further alternative, we here investigate a combination of solar-electric propulsion and radioisotope-electric propulsion. The solar-electric propulsion stage consists of six 22 cm diameter "RIT-22"ion thrusters working with a high specific impulse of 7377 s corresponding to a positive grid voltage of 5 kV. Solar power of 53 kW BOM is provided by a light-weight solar array. The REP-stage consists of four space-proven 10 cm diameter "RIT-10" ion thrusters that will be operating one after the other for 9 yrs in total. Four advanced radioisotope generators provide 648 W at BOM. The scientific instrument package is oriented at earlier studies. For its mass and electric power requirement 35 kg and 35 W are assessed, respectively. Optimized trajectory calculations, treated in a separate contribution, are based on our "InTrance" method.The program yields a burn out of the REP stage in a distance of 79.6 AU for a usage of 154 kg of Xe propellant. With a C3 = 45,1 (km/s)2 a heliocentric probe velocity of 10 AU/yr is reached at this distance, provided a close Jupiter gravity assist adds a velocity increment of 2.7 AU/yr. A transfer time of 23.8 yrs results for this scenario requiring about 450 kg Xe for the SEP stage, jettisoned at 3 AU. We interpret the SEP/REP propulsion as a competing alternative to solar sail and ballistic/REP propulsion. Omiting a Jupiter fly-by even allows more launch flexibility, leaving the mission duration in the range of the ESA specification.}, language = {en} }