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Project management theory provides insufficient insight on the effects of crashing and overlapping in product development (PD) projects. The scholarly literature largely assumes that networks of project activities are acyclical. PD projects are iterative, however, and the time-cost implications of managerial actions, such as activity crashing and overlapping, differ in this context. We build a rich...
The goal of this work was to evaluate the wear behavior of PEEK gear wheels in a simulated space environment and their applicability in space mechanisms. With that study the question shall be answered if, despite a possible increased of the wear rate of a PEEK pinion, the accuracy requirements of a pointing mechanism can still be met.
Real-time Tele-operation (RTTO) is a control concept for tasks in which in-situ manipulations by humans are not feasible (e.g. dangerous environmental conditions), and autonomous control is demanding due to complex tasks and unforeseeable problems arising during mission conduct. Possible applications of RTTO in space vary from debris removal, using robotic spacecraft to on-orbit servicing of existing...
Rendezvous & Docking will be an essential part for many future spaceflight activities, like manned or unmanned exploration of the Moon or Near Earth Objects (NEOs), a Mars Sample Return mission, as well as On-Orbit Servicing or Space Debris Removal activities. While autonomy is expected to play a major role in future Rendezvous & Docking, human operators on the ground will still perform either...
We discuss the possibility of an autonomous navigation system for spacecraft that is based on pulsar timing data. Pulsars are rapidly rotating neutron stars that are observable as variable celestial sources of electromagnetic radiation. Their periodic signals have timing stabilities comparable to atomic clocks and provide characteristic temporal signatures that can be used as natural navigation beacons,...
The collaborative research center SFB453 (www.sfb453.de) aims to realize high-fidelity telepresence and teleaction systems. Telepresence and teleaction systems extend the human workspace to remote locations in order to overcome barriers like distance, scaling, danger or the human skin. Using a human-system interface the human operator controls a remotely located teleoperator. Multi-modal feedback...
The major part of the recent research efforts in the field of robotic on-orbit servicing (OOS) has been spent on pursuing autonomous systems, such as Orbital Express or ETS-VII. TU Munich's Institute of Astronautics (LRT) considers the degree of flexibility required of an OOS system to be only achievable by keeping human operators in the loop, by means of telepresence. However, the absence of important...
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