2002 Fiscal Year Final Research Report Summary
ACTIVE CONTROL OF ULTRALIGHT-WEIGHT AND FLEXIBLE SPACE STRUCTURES
| Project/Area Number |
12450396
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Aerospace engineering
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| Research Institution | OSAKA PREFECTURE UNIVERSITY |
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Principal Investigator |
OKUBO Hiroshi OSAKA PREFECTURE UNIVERSITY, DEPT. OF AEROSPACE ENGINEERING, PROFESSOR, 大学院・工学研究科, 教授 (40094502)
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| Co-Investigator(Kenkyū-buntansha) |
MURAMATSU Ei'ichi YAMAGATA UNIVERSITY, FUCULTY OF ENGINEERING, ASSOCIATE PROFESSOR, 工学部, 助教授 (40273809)
TOKUTAKE Hiroshi OSAKA PREFECTURE UNIVERSITY, DEPT. OF AEROSPACE ENGINEERING, RESAECH ASSOCIATE, 大学院・工学研究科, 助手 (80295716)
AZUMA Hisao OSAKA PREFECTURE UNIVERSITY, DEPT. OF AEROSPACE ENGINEERING, PROFESSOR, 大学院・工学研究科, 教授 (50316006)
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| Project Period (FY) |
2000 – 2002
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| Keywords | FLEXIBLE SPACE STRUCTURES / ACTIVE CONTROL / VIBRATION CONTROL / CONTROL / STRUCTURE DESIGN / SMART STRUCTURES / ROBUST CONTROL / FAULT DETECTION / PEZOELECTRIC DEVICES |
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| Research Abstract |
In this research project, the use of smart structural systems has been proposed for space structures such as large flexible space antenna, where many active sensor and actuator devices are imbedded onto the structures for precision control, shape determination, and vibration suppression. The project also includes the development of software algorithms for fault detection and identification because there exists the need for developing highly reliable control systems for on-orbit application of such smart structures.
(1) Studies on Controller Design for Flexible Space Structures
1-1 Methods of controller design have been developed for shape and vibration control of highly flexible structures. Intensive studies have been carried out emphasizing robustness of the control system against both spillover instability and uncertain structural parameters.
1-2 A method of vibration control for flexible structures with piezoelectric actuators has been developed. Sliding mode control has been applied t
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o the model of a cantilever beam with parameter errors. The designed controller shows high performance of robustness against the model errors.
1-3 Simultaneous optimal design problem has been solved to find the best set of structural parameters and output controller. The proposed design method is based on Bilinear Matrix Inequality (BMI) and presents an improved branch and bound method for BMI by using graph theory. The method is useful for simple structural systems with low degrees of freedom. Further studies are needed for the simultaneous optimal design of structural/control systems in the case of more complex structures.
(2) Fault Detection and Identification for Smart Structure Control Systems
Model-based FDI (Failure Detection and Isolation (FDI) systems for smart structures have been studied with careful considerations about robustness with respect to model uncertainties. A new method of robust fault detection has been proposed that is insensitive to the disturbances caused by unknown modeling errors while it is highly sensitive to the component failures. The capability of the robust detection algorithm is examined for the sensor failure of a flexible smart beam control system. The proposed method suppresses the disturbances due to model errors and remarkably markedly improves the detection performance. Less
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Research Products
(20 results)
