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Research on Local Resonance and Active Control for Large Flexible Antenna of Spacecraft

Author: XuDong
Tutor: WangCong
School: Harbin Institute of Technology
Course: General and Fundamental Mechanics
Keywords: large flexible antenna local mode active vibration control cable-membrane structure numerical simulation
CLC: V414.33
Type: Master's thesis
Year: 2008
Downloads: 167
Quote: 1
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Abstract


With development of the space cause, large flexible antenna is more and more used in space technology. Because of manufacture, material and problems in using process etc. leading to detuning of antenna structure, vibration modal of the structure along the circumferential are not evenly distributed. This local mode can greatly reduce the capacity of satellite for receiving data, accelerate fatigue failure of the structure, and even effect structural life time. Conventional passive control can’t meet the demand of the reliability of structure. The active vibration control becomes the inevitable choice. So carrying on the study of the method of active vibration control will bring significance of theory and practicability.The primary research work of this paper is to study active control method of local mode for large flexible antenna. First, this article has made the detailed elaboration on the structure composition of peripheral truss antenna. Then, the finite element analytical model is established for deployable antenna on structure in software of ANSYS, the inherent frequency and vibration mode of ordered and disordered periodic structure were obtained. Through comparing, it is proved that small mistune can make vibration mode sharp change, and the vibration was limited to local area of the structure, that is vibration mode localization phenomenon.Based on the equation has been eliminated coupling and result performed by FEM software, Negative Velocity Feedback Control and Independent Modal Space Control technique which has good robustness and based on Linear Quadratic Regulator control methodology is adopt for finding out the active control gain and controlling structure vibration. In order to validate the validity of the vibration control method, a study on numerical simulation is carried out on wrapped rib dish antenna. First, modal vibration shape of disordered periodic structure is calculated, and obtains the mass matrix and stiffness matrix of disordered periodic structure in software of ANSYS. Then, the matrixes are introduced into software of MATBLAB, and a simulation is carried out by using SIMULINK. At last, the paper worked out response curves of structure controlled and uncontrolled. Through comparing, it is efficient of vibration suppression to the structure on two control methods; and the control result of Linear Quadratic Regulator control methodology is better than Negative Velocity Feedback Control’s in the same condition.

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CLC: > Aviation, aerospace > Aerospace ( Astronauts ) > Basic theory and experiments > Spacecraft structural mechanics > Plates, shells,beams > Vibration
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