Refine
Year of publication
- 2007 (271) (remove)
Institute
- Fachbereich Medizintechnik und Technomathematik (52)
- Fachbereich Wirtschaftswissenschaften (42)
- Fachbereich Elektrotechnik und Informationstechnik (38)
- Fachbereich Luft- und Raumfahrttechnik (31)
- Fachbereich Bauingenieurwesen (29)
- IfB - Institut für Bioengineering (29)
- Fachbereich Energietechnik (23)
- Fachbereich Chemie und Biotechnologie (20)
- Fachbereich Maschinenbau und Mechatronik (20)
- INB - Institut für Nano- und Biotechnologien (19)
Has Fulltext
- no (271) (remove)
Document Type
- Article (170)
- Conference Proceeding (44)
- Book (28)
- Part of a Book (16)
- Patent (6)
- Contribution to a Periodical (2)
- Doctoral Thesis (2)
- Report (2)
- Bachelor Thesis (1)
Keywords
Stahlbau
(2007)
Stahlbau
(2007)
Solar Sail Kinetic Energy Impactor Trajectory Optimization for an Asteroid-Deflection Mission
(2007)
Siedlungswasserwirtschaft
(2007)
Siedlungswasserwirtschaft
(2007)
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.
We propose a simple parametric OSSD model that describes the variation of the sail film's optical coefficients with time, depending on the sail film's environmental history, i.e., the radiation dose. The primary intention of our model is not to describe the exact behavior of specific film-coating combinations in the real space environment, but to provide a more general parametric framework for describing the general optical degradation behavior of solar sails.