采用压电开关分流电路技术的半主动振动控制

利用压电材料的正压电效应,设计出一种新型的状态开关型压电分流电路.由压电换能器将结构振动变形的应变能转化为电介能,当压电换能器极化表面的电荷积聚达到最大值时,闭合分流电路中的状态开关,分流电路短路,压电换能器上下表面的正负电荷中和抵消,以焦耳热的形式耗散掉电介能,达到抑制结构振动的目的.将这种振动控制技术应用于柔性悬臂梁的振动抑制,研究状态开关闭合持续时间对抑振效果的影响.实验结果表明,开关的闭合持续时间约为结构振动周期的1/10时,抑振效果最佳,悬臂梁第一阶稳态响应幅值降低量约为55%.

SEMI-ACTIVE VIBRATION CONTROL BY STATE-SWITCHED PIEZOELECTRIC SHUNT CIRCUIT

The piezoelectric state-switched shunt circuit technique is an emerged semi-active vibration control approach. In this approach,the two poles of the bonded piezoelectric transducer are switched from the open state to short state,which leads to two kinds of vibration suppression effects: variable equivalent stiffness and energy dissipation. A novel piezoelectric state-switched shunt circuit is proposed based on the piezoelectric effects. The state-switch is closed when the induced electric charge on the piez...