NEAR-MINIMUM TIME OPTIMAL CONTROL OF FLEXIBLE SPACECRAFT DURING SLEWING MANEUVER

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EBRAHIMI A.; MOUSAVIAN SEYED ALI AKBAR; MIRSHAMS M.

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Journal: ESTEGHLAL Year:2005 | Volume:24 | Issue:2 Page(s): 123-135

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Information Journal Paper

Title

NEAR-MINIMUM TIME OPTIMAL CONTROL OF FLEXIBLE SPACECRAFT DURING SLEWING MANEUVER

Author(s)

EBRAHIMI A. | MOUSAVIAN SEYED ALI AKBAR | MIRSHAMS M. | Issue Writer Certificate

Keywords

SLEWING SPACECRAFTQ4

FLEXIBLE ELEMENTSQ4

OPTIMAL CONTROLQ2

COMMAND SHAPINGQ4

Abstract

The rapid growth of space utilization requires extensive construction, and maintenance of space structures and satellites in orbit. This will, in turn, substantiate application of robotic systems in space. In this paper, a near-minimum-time OPTIMAL CONTROL law is developed for a rigid space platform with flexible links during an orientating maneuver with large angle of rotation. The time OPTIMAL CONTROL solution for the rigid-body mode is obtained as a bang-bang function and applied to the flexible system after smoothening the control inputs to avoid stimulation of the flexible modes. This will also reflect practical limitations in exerting bang-bang actuator forces/torques, due to delays and non-zero time constants of existing actuation elements. The smoothness of the input command is obtained by reshaping its profile based on consideration of additional first-order and second order derivative constraints. The platform is modeled as a linear undamped elastic system that yields an appropriate model for the analysis of planar rotational maneuvers. The developed control law is applied on a given satellite during a slewing maneuver. The simulation results show that the modified realistic optimal input compared to the bang-bang solution agrees well with the practical limitations and also alleviates the vibrating motion of the flexible appendage, which reveals the merits of the new control law developed here.

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APA: Copy

EBRAHIMI, A., MOUSAVIAN, SEYED ALI AKBAR, & MIRSHAMS, M.. (2005). NEAR-MINIMUM TIME OPTIMAL CONTROL OF FLEXIBLE SPACECRAFT DURING SLEWING MANEUVER. ESTEGHLAL, 24(2), 123-135. SID. https://sid.ir/paper/6067/en

Vancouver: Copy

EBRAHIMI A., MOUSAVIAN SEYED ALI AKBAR, MIRSHAMS M.. NEAR-MINIMUM TIME OPTIMAL CONTROL OF FLEXIBLE SPACECRAFT DURING SLEWING MANEUVER. ESTEGHLAL[Internet]. 2005;24(2):123-135. Available from: https://sid.ir/paper/6067/en

IEEE: Copy

A. EBRAHIMI, SEYED ALI AKBAR MOUSAVIAN, and M. MIRSHAMS, “NEAR-MINIMUM TIME OPTIMAL CONTROL OF FLEXIBLE SPACECRAFT DURING SLEWING MANEUVER,” ESTEGHLAL, vol. 24, no. 2, pp. 123–135, 2005, [Online]. Available: https://sid.ir/paper/6067/en

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