منابع مشابه
Fuel/Time Optimal Control of Spacecraft Maneuvers
which clearly reduces to the vacuum case de ned by Eq. (3) as ̄ ! 0. The velocity- ight-path-angle pro le is shown in Fig. 2 for a range of drag parameters ̄ . It can be seen that as the effect of air drag increases, the trajectory curves more quickly toward the local vertical.Because the effect of drag is to increasethe effectivethrustweight ratio of the vehicle, the descentmaneuvermay be com...
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The capability of attitude maneuvers and attitude tracking for spacecrafts is required in the current sophisticated space missions. In short, it is to obtain command requirements and attitude orientation after some form of control. With the development of space missions, the ability of rapid and energy-saved large-angle attitude maneuvers is actively expected. And the high requirements for the ...
متن کاملRobust Optimal Control of Flexible Spacecraft During Slewing Maneuvers
In this paper, slewing maneuver of a flexible spacecraft with large angle of rotation is considered and assuming structural frequency uncertainties a robust minimum-time optimal control law is developed. Considering typical bang-bang control commands with multiple symmetrical switches, a parameter optimization procedure is introduced to find the control forces/torques. The constrained minimizat...
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Although there have been a variety of studies about vehicular maneuvers on land or sea, maneuvers within a small area that require direction changes have rarely been discussed. The arrival or departure of ships to or from ports requires safe and effective turning maneuvers within a narrow area. In this study, we decompose the maneuver procedure into several operations, then establish an operati...
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This papers looks at moving a group of mobile robots in formation via a virtual leader-follower scheme. A novel way of introducing feedback from followers to a virtual leader is presented. Hardware results are presented for Hilare-type mobile robots.
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ژورنال
عنوان ژورنال: Études rurales
سال: 2002
ISSN: 0014-2182,1777-537X
DOI: 10.4000/etudesrurales.7979