| Project/Area Number |
05650399
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
計測・制御工学
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| Research Institution | Kobe University |
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Principal Investigator |
IKEDA Masao Kobe University, Faculty of Engineering, Professor, 工学部, 教授 (00031146)
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| Co-Investigator(Kenkyū-buntansha) |
MIURA Atsuyoshi Kobe University, Graduate School of Science and Technology, Research Associate, 大学院・自然科学研究科, 助手 (60252805)
MATSUNO Fumitoshi Kobe University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (00190489)
TADA Yukio Kobe University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (70135812)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1994: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1993: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Large space structures / Decentralized control |
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| Research Abstract |
This research is concerned with attitude control and vibration suppression of large space structures with uncertainties. The objective is to develop decentralized control strategies compatible with subsystems. The main contributions are as follows :
1. The transfer functions of space structures with collocated sensors and actuators are symmetric. It is shown that for such systems, symmetric controllers are more effective than non-symmetric ones in robust stabilization. Design methods for symmetric controllers are developed.
2. A decentralized H* control scheme is proposed for large-scale systems composed of a number of subsystems. The local controllers are H* output feedback controllers for individual subsystems. Quadratic stabilization methods are also developed.
3. Optimum design of structures is proposed considering control performances. An H* controller is employed to suppress time-varying disturbances. The objective function to be minimized represents the effect of given initial loads.
4. Modeling and vibration suppression methods are developed for a satellite with flexible solar paddles. To use reduced-order models for design of controllers, spillover suppression methods are proposed. Comparisons between frequency-dependent LQ controllers and H* controllers are presented.
5. A linear plant with variable operating conditions is described by an interpolation of nominal models corresponding to a number of representative operating conditions. An interpolation of stabilizing controllers for nominal models is proposed to stabilize such an interpolated plant. Stabilizability conditions are obtained.
6. The concept of parametric stability is extended to include Lur'e-type nonlinear control systems with uncertain parameters and constant reference inputs. Conditions for parametric absolute stability are derived, which guarantee that the system remains stable despite equilibrium shifts caused by parameter variations and changes in the reference input.
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