报告题目：Satellite Attitude Control Designs in Presence of Reaction Wheel Faults/Failures
报 告 人：Danwei Wang
Satellite attitude control systems are designed to operate for many years with requirement of high accuracy, good performance, reliability, robust and energy efficiency. Reaction wheels are the key actuators in the attitude control systems and they can malfunction in operation which can result in unsatisfactory performance. It is critical to have a fault tolerant controller in place for such situations. In this presentation, the reaction wheel faults include most common problems of loss of efficiency and bias. They are modelled explicitly in the attitude control system dynamics and the physical interpretations are properly justified. Two classes of fault tolerant control frameworks are developed and various control designs are presented with theoretical justifications and simulation verifications with realistic satellite parameters. One framework is passive fault tolerant control and another is active fault tolerant control. Comparative studies and case examples are analyzed in details to show the difference, characteristics, and complementary natures.
Danwei Wang received his Ph.D and MSE degrees from the University of Michigan, Ann Arbor in 1989 and 1985, respectively. He received his B.E degree from the South China University of Technology, China in 1982. Since 1989, he has been with the School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore. Currently, he is a professor and director, EQUISITUS, Centre for System Intelligence and Efficiency, Director, ST Engineering – NTU Corporate Laborator and deputy director of the Robotics Research Center, NTU. He also served as Head of Division of Control and Instrumentation, School of EEE from 2005 to 2011. He has served as general chairman, technical chairman and various positions in international conferences, such as International Conference on Control, Automation, Robotics and Vision (CARCVs), IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS) and IEEE International Conference on Robotics and Automation (ICRA). He has served or is serving as an associate editor of Conference Editorial Board, IEEE Control Systems Society, an associate editor of the International Journal of Humanoid Robotics, and an active member of IEEE Singapore Robotics and Automation Chapter. He was a recipient of Alexander von Humboldt fellowship, Germany. His research interests include robotics, control theory and applications. He has published 2 monographs and more than over 300 technical articles in the areas of robotics, control theories and applications, as well as fault diagnosis and prognosis of complex engineering systems.