| Spacebone SAR antenna is a type of Large Flexible Space Structure, their vibrations will be caused by various loads inevitably on the track. The vibrations of spacebone SAR antenna will seriously affect both attitude's stability and pointing precision of the SAR satellite. It will also deterioration imaging quality, depress resolving power, even cause structural destruction of the spacebone SAR antenna. At the present time, the foreign countries have many high resolution SAR satellites, but the key techniques possessed by foreign scientists and technicians for vibration control of spacebone SAR antenna are not published. And the related problems which have been researched by domestic scientists and technicians have still not resolved. To solve the vibration problem of spacebone SAR antenna, in this dissertation, the dynamic model is derived, the decentralized fuzzy vibration control method is proposed, and the simulation is present. The main studies include in this thesis are as follows:1. The dynamic models of the SAR antenna smart structure are established, and the dynamic characteristics of the system are analyzed.(1) The structure characteristic of the SAR antenna is analyzed, and the simplified model is presented.(2) According to the basic equation of piezoelectric materials, the coupled piezoelectric-mechanical dynamic model of the active rod is obtained.(3) The integrated dynamic model of the spacebone SAR antenna with smart structure is obtained, and the dynamic characteristic is analyzed.(4) The performance of the vibrating SAR antenna is investigated.2. The decentralized fuzzy vibration control method for the SAR antenna smart structure is proposed.(1) The vibration control system of spacebone SAR antenna with smart structure is decentralized according to decentralized control theory.(2) The decentralized fuzzy vibration controller for spacebone SAR antenna with smart structure is designed by integrating decentralized control theory and fuzzy control theory.3. The simulations of decentralized fuzzy vibration control for the SAR antenna smart structure are carried out.The simulations of decentralized fuzzy vibration control for the decentralized subsystem and the whole system under three excitation conditions are carried out.Through the research work in this thesis, the dynamic modeling problem of the SAR antenna smart structure is solved, the dynamic characteristics of it is obtained, , the decentralized fuzzy vibration control system design problem of the SAR antenna smart structure is solved, the simulation system is established, the simulation result demonstrate that decentralized fuzzy controller can suppress the vibrations stably and effectively. |
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