论文标题:智能压电柔性板多输入多输出振动主动控制研究
Research on MIMO Active Vibration Control for Intelligent Piezoelectric Flexible Plate
论文作者 袁华
论文导师 陈仁文,论文学位 硕士,论文专业 测试计量技术与仪器
论文单位 南京航空航天大学,点击次数 84,论文页数 70页File Size1902k
2005-03-01论文网 http://www.lw23.com/lunwen_799873882/ 压电智能结构;柔性板;振动主动控制;优化布置;特征建模;多输入多输
Piezoelectric intelligent structures; Tow-dimension flexible plate; Active vibration control; Location Optimization; Characteristic model; MIMO
研究背景为空间挠性结构的智能自主控制。主要针对航天柔性结构中常见的悬臂外伸二维薄板结构的振动主动控制展开研究,以一套模拟卫星太阳能帆板的环氧树脂柔性悬臂板系统为研究对象,利用压电智能结构对柔性板存在的弯曲模态和扭转模态二维耦合振动进行主动控制,并进行了相关的理论和实验研究。首先分析了压电材料的基本特性,给出了一维和二维传感和驱动方程。指出D优化方法和模态力准则的共同本质是将传感器和驱动器布置在模态应变最大的地方,可以直接从寻找结构模态应变最大处入手进行压电片位置优化。在分析柔性板模态振型特点的基础上,通过适当的压电片布置实现了柔性板弯曲模态和扭转模态相互独立的传感和控制通道。利用特征建模的思想克服了柔性结构难以精确建模的困难,设计了简单有效、便于工程实现的基于柔性板特征模型的自适应控制律。采用上述研究结果建立了基于计算机的多输入多输出柔性板二维振动主动控制实验系统。实验结果表明所设计的系统不仅可以很好的控制柔性板单个模态的振动,对于弯/扭二维耦合振动亦有较好的控制效果,证明了压电传感器和驱动器布置的合理性以及所用控制方法的有效性。
Piezoelectric intelligent material is used to suppress the vibration of a flexible cantilevered epoxy plate which is used to simulate satellite’s solar board. Sensing and actuating models of one-dimension and two-dimension piezoelectric structures are set up. It is proved that the main way of D-optimization method and modal-force rule to optimize the location of the sensors and actuators are the same, which is to put the sensors and actuators on the place of maximum modal strain. By analyzing the characteristics of flexible plate, two respective control channels for the vibration control of the two-dimension flexible plate are realized through the proper arrangement of the piezoelectric elements. Based on the characteristic model of plate, adaptive control strategy which is simple, effective and easy, are designed. A computer based multi-in and multi-out (MIMO) active vibration control system for the flexible plate is established. Experiments of vibration control are carried out, the results show that the designed system can control very well the vibration of not only the single mode but also two coupled modes of the cantilever plate. The results prove that the arrangement of piezoelectric sensors and actuators is reasonable and the control methods are effective.
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