Cognitive communications for NASA space systems [International Communications Satellite Systems Conference]

Author(s):  
D. Chelmins ◽  
J. Briones ◽  
J. Downey ◽  
G. Clark ◽  
A. Gannon
Author(s):  
Takashi Takahashi ◽  
Saburo Matunaga

Abstract In order to analyze dynamics of space systems, such as cluster satellite systems and the capturing process of damaged satellites, it is necessary to consider such space systems as reconfigurable multibody systems. In this paper, we discuss the numerical computation of the dynamics of the ground experiment system to simulate the capturing and berthing process of a satellite by a dual-manipulator on the flat floor as an example. We have previously discussed the efficient dynamics algorithm for reconfigurable multibody system with topological changes. However, the contact dynamics, which is one of the most difficult issues in our study, remains to be discussed. We introduce two types of the linear complementarity problem (LCP) concerned with contact dynamics. The difference between the two types of LCP is whether impacts can be considered. Dynamic systems with impacts and friction are non-conservation systems; moreover the LCP is not always solvable. Therefore we must check if the solutions of the numerical computation are correct, or how accurate they are. In this paper, we derive the method of numerical computation with guaranteed accuracy of the LCP for contact dynamics.


2021 ◽  
Author(s):  
Jordan L Stern ◽  
Paul T. Grogan

Motivated by the growth of the commercial space economy and renewed focus on the disaggregation of military space systems, this work develops a method for conceptual design of federated satellite systems as a collaborative system-of-systems (SoS). Objectives seek to improve the likelihood of successful SoS formation and pursue constituent system utility robustness. The proposed metaheuristic optimization tradespace exploration method accounts for technical and economic design variables and multi-decision maker strategy dynamics. Constituent system designs are ranked on their simulated net present value. A game-theoretic measure of risk dominance is used in concert with net present value to assess robustness and utility of candidate SoS designs. The method is validated with a notional application case that assesses potential collaboration between Earth observing and telecommunications systems. Results demonstrate a fundamental trade between system efficiency and robustness and highlight the importance of accounting for strategy dynamics when designing systems for collaboration.


2001 ◽  
Vol 7 (4) ◽  
pp. 122-125
Author(s):  
V.N. Roman'ko ◽  
◽  
E.N. Khomyakov ◽  
S.T. Cherepkov ◽  
◽  
...  

2005 ◽  
Vol 11 (3-4) ◽  
pp. 75-80 ◽  
Author(s):  
O.D. Fedorovskyi ◽  
◽  
V.G. Yakimchuk ◽  
E.N. Bodnar ◽  
Z.V. Kozlov ◽  
...  

2003 ◽  
Vol 8 (5-6) ◽  
pp. 174-179
Author(s):  
A.V. Agarkov ◽  
◽  
A.L. Makarov ◽  
S.A. Matvienko ◽  
A.V. Meleshko ◽  
...  
Keyword(s):  

2017 ◽  
Author(s):  
Tomaso de Cola ◽  
Alberto Ginesi ◽  
Giovanni Giambene ◽  
George C. Polyzos ◽  
Vasilios A. Siris ◽  
...  
Keyword(s):  

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