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Year of publication
Institute
- IfB - Institut für Bioengineering (602) (remove)
Language
- English (602) (remove)
Document Type
- Article (404)
- Conference Proceeding (146)
- Part of a Book (34)
- Book (7)
- Doctoral Thesis (3)
- Other (3)
- Lecture (2)
- Conference: Meeting Abstract (1)
- Patent (1)
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Keywords
- Finite-Elemente-Methode (7)
- Limit analysis (6)
- Clusterion (5)
- Shakedown analysis (5)
- solar sail (5)
- Air purification (4)
- Einspielen <Werkstoff> (4)
- Hämoglobin (4)
- Lipopolysaccharide (4)
- Luftreiniger (4)
Grundmann, Jan Thimo ; Boden, Ralf ; Ceriotti, Matteo ; Dachwald, Bernd ; Dumont, Etienne ; Grimm, Christian D. ; Lange, Caroline ; Lichtenheldt, Roy ; Pelivan, Ivanka ; Peloni, Alessandro ; Riemann, Johannes ; Spröwitz, Tom ; Tardivel, Simon
The scientific interest for near-Earth asteroids as well as the interest in potentially hazardous asteroids from the perspective of planetary defense led the space community to focus on near-Earth asteroid mission studies. A multiple near-Earth asteroid rendezvous mission with close-up observations of several objects can help to improve the characterization of these asteroids. This work explores the design of a solar-sail spacecraft for such a mission, focusing on the search of possible sequences of encounters and the trajectory optimization. This is done in two sequential steps: a sequence search by means of a simplified trajectory model and a set of heuristic rules based on astrodynamics, and a subsequent optimization phase. A shape-based approach for solar sailing has been developed and is used for the first phase. The effectiveness of the proposed approach is demonstrated through a fully optimized multiple near-Earth asteroid rendezvous mission. The results show that it is possible to visit five near-Earth asteroids within 10 years with near-term solar-sail technology.
Solar sails enable missions to the outer solar system and beyond, although the solar
radiation pressure decreases with the square of solar distance. For such missions, the solar sail may gain a large amount of energy by first making one or more close approaches to the sun. Within this paper, optimal trajectories for solar sail missions to the outer planets and into near interstellar space (200 AU) are presented. Thereby, it is shown that even near/medium-term solar sails with relatively moderate performance allow reasonable transfer times to the boundaries of the solar system.
Ice melting probes
(2023)
Dachwald, Bernd ; Ulamec, Stephan ; Kowalski, Julia ; Boxberg, Marc S. ; Baader, Fabian ; Biele, Jens ; Kömle, Norbert
The exploration of icy environments in the solar system, such as the poles of Mars and the icy moons (a.k.a. ocean worlds), is a key aspect for understanding their astrobiological potential as well as for extraterrestrial resource inspection. On these worlds, ice melting probes are considered to be well suited for the robotic clean execution of such missions. In this chapter, we describe ice melting probes and their applications, the physics of ice melting and how the melting behavior can be modeled and simulated numerically, the challenges for ice melting, and the required key technologies to deal with those challenges. We also give an overview of existing ice melting probes and report some results and lessons learned from laboratory and field tests.
We present the novel concept of a combined drilling and melting probe for subsurface ice research. This probe, named “IceMole”, is currently developed, built, and tested at the FH Aachen University of Applied Sciences’ Astronautical Laboratory. Here, we describe its first prototype design and report the results of its field tests on the Swiss Morteratsch glacier. Although the IceMole design is currently adapted to terrestrial glaciers and ice shields, it may later be modified for the subsurface in-situ investigation of extraterrestrial ice, e.g., on Mars, Europa, and Enceladus. If life exists on those bodies, it may be present in the ice (as life can also be found in the deep ice of Earth).
We present a new approach to the problem of optimal control of solar sails for low-thrust trajectory optimization. The objective was to find the required control torque magnitudes in order to steer a solar sail in interplanetary space. A new steering strategy, controlling the solar sail with generic torques applied about the spacecraft body axes, is integrated into the existing low-thrust trajectory optimization software InTrance. This software combines artificial neural networks and evolutionary algorithms to find steering strategies close to the global optimum without an initial guess. Furthermore, we implement a three rotational degree-of-freedom rigid-body attitude dynamics model to represent the solar sail in space. Two interplanetary transfers to Mars and Neptune are chosen to represent typical future solar sail mission scenarios. The results found with the new steering strategy are compared to the existing reference trajectories without attitude dynamics. The resulting control torques required to accomplish the missions are investigated, as they pose the primary requirements to a real on-board attitude control system.
Krämer, Stefan ; Daab, Dominique Jonas ; Müller, Brigitte ; Wagner, Tobias ; Baader, Fabian ; Hessel, Joana ; Gdalewitsch, Georg ; Plescher, Engelbert ; Dachwald, Bernd ; Wahle, Michael ; Gierse, Andreas ; Vetter, Rudolf ; Pfützenreuter, Lysan