2006 Fiscal Year Final Research Report Summary
ACTIVE SHAPE AND VIBRATION CONTROL OF ULTRA LIGHT AND FLEXIBLE SPACE STRUCTURES
| Project/Area Number |
15360451
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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, Graduate School of Engeineering, PROFESSOR, 工学研究科, 教授 (40094502)
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| Co-Investigator(Kenkyū-buntansha) |
AZUMA Hisao OSAKA PREFECTURE UNIVERSITY, Graduate School of Engeineering, PROFESSOR (Retired, 3.2005), 工学研究科, 教授(退職) (50316006)
SHIMOMURA Takashi OSAKA PREFECTURE UNIVERSITY, Graduate School of Engeineering, ASSISTANT PROFESSOR, 工学研究科, 講師 (40243191)
TOKUTAKE Hiroshi OSAKA PREFECTURE UNIVERSITY, Graduate School of Engineering, INSTRUCTOR, 工学研究科, 助手 (80295716)
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| Project Period (FY) |
2003 – 2006
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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 smart structure systems have been proposed for ultra light and flexible 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/or vibration suppression.
1.The concept of ultra light space structure has been intensively studied. Researches were made for developing smart structures that realizes virtual rigidity and active vibration suppression.
2.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.
3.Methods of vibration control for flexible structures with piezoelectric actuators have been developed. Among them, a sliding mode control has been applied to the model of a cantilever beam with parameter errors. The designed co
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ntroller shows high performance of robustness against the model errors.
4.Simultaneous optimal design problem has been solved to find the best set of structural parameters and output controller. One of the proposed design methods is based on Bilinear Matrix Inequality (BMI) and presents an improved branch and bound method for BMI by using graph theory. The second approach is based on Linear Matrix Inequality (LMI). The proposed method has been successfully applied to the simultaneous structure and controller of smart structures.
5.A smart structure has been studied for noise reduction and acoustic excitation suppression of flexible structures. The properly designed smart panel activated with piezoelectric actuators is highly effective in suppressing the acoustic excitation of the target structure due to the noise transmitting through the panel structure.
6.Model-based FDI (Failure Detection and Isolation systems for smart structures have been studied with careful considerations about robustness with respect to model uncertainties. A new subspace-based system identification algorithm has been developed and successfully applied to the fault detection of a smart structure. Less
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