基于压电开关分流电路的板振动半主动控制

Semi-active Vibration Control of a Plate Based on Switched Piezoelectric Shunt Circuit

研究了状态开关分流电路与同步开关分流电路的抑振原理和实现方法;设计出一种控制这两种开关开闭状态的控制器;分别选用这两种开关分流电路对板进行抑振实验,实验中状态开关分流电路和同步开关分流电路控制下板的第一阶稳态响应分别得到约13.4%和50.6%的降低效果;研究了同步开关分流电路的抑振效率与其电感的取值及开关的持续闭合时间之间的关系,实验证明了开关的最佳闭合时间为1/2振荡电路周期,而当电路振荡频率与结构振动频率比值间于10～50时,所对应的电感取值为其最佳取值范围。

The principle of semi-active vibration control based on piezoelectric shunt damping for state-switch and synchronized-switch shunt circuits is studied in the present paper.A controller is designed to control the switches of two shunt circuits.Experiments are performed to control the first modal response of a clamped square plate by two shunt circuits.The results show that the harmonic vibration responses of the first mode can be suppressed by the vi-bration reduction of 13.4% and 50.6% respectively with the control of the state-switch and the synchronized-switch shunt circuit.The effect of the inductance and the closed time of the synchronized-switch shunt circuit is also studied experimentally.Results Show that the closed time of the switch is half the period of the circuit,and the resonance frequency of the circuit is 10 to 50 times of the frequency of the structure.