Volume 24, Issue 2 (1-2006)                   2006, 24(2): 123-135 | Back to browse issues page

XML Persian Abstract Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

A. Ebrahimi, S. A.A. Mousavian, and M. Mirshams. Near-Minimum Time Optimal Control of Flexible Spacecraft during Slewing Maneuver. Journal of Advanced Materials in Engineering (Esteghlal) 2006; 24 (2) :123-135
URL: http://jame.iut.ac.ir/article-1-364-en.html
Abstract:   (6933 Views)
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.
Full-Text [PDF 368 kb]   (1578 Downloads)    
Type of Study: Research | Subject: General
Received: 2014/10/25 | Published: 2006/01/15

Add your comments about this article : Your username or Email:
CAPTCHA

© 2024 CC BY-NC 4.0 | Journal of Advanced Materials in Engineering (Esteghlal)

Designed & Developed by : Yektaweb