模态自适应相位调制的多压电元件压电分流系统  

Piezoelectric shunt damping system with multiple transducers using techniques of mode adaptation and phase shift

作　　者：杨智春[1] 孙浩[1] 

机构地区：[1]西北工业大学航空学院,西安710072

出　　处：《振动与冲击》2011年第11期90-94,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金(50375122);高等学校学科创新引智计划(B07050)

摘　　要：在含有多个压电元件的压电分流系统中,各压电元件的输出电压之间的相位关系会随着结构振动模态的变化而变化,导致诱发电荷中和抵消,降低了压电分流系统的抑振效果。由此,该文提出了几种典型的等效电压源网络拓扑结构,在分析各自优缺点的基础上,将并联连接确定为最佳组网方式。针对此组网方式,为了保证在不同阶次的模态响应下,各压电元件的输出电压均保持同相,提出了具有模态自适应能力的相位调制技术,并设计制作了相应的模拟电路。仿真结果表明,该系统能够可靠的完成自适应相位调制,避免了多压电元件压电分流系统电荷中和现象的出现。It is known that the polarity of PZT transducer is determined by its strain state induced by the target structure under different vibration mode.In building the piezoelectric shunt damping system,multiple piezoelectric elements must be connected properly so as to obtain an integral voltage source,and then connect with the shunt circuit.For this purpose,some typical topological structures of electric network of piezoelectric shunt damping system were proposed.A critical analysis on the advantages and disadvantages of these networks in practical applications was accomplished.Based on the analysis the parallel connection was selected as the best configuration.According to the phase difference among different piezoelectric elements in this connection,a module of modal adaptation and phase shifting system was designed and built.With this module,the shunt circuit can follow the vibration modes of the structure and regulate the phases of output voltages of piezoelectric elements and make them synchronized automatically.By means of the concept of modal adaptation and phase shifting,the neutralization of induced charges on polarized surfaces of different PZT transducers can be avoided.

关 键 词：压电分流 相位调制 多压电元件 振动控制 网络拓扑 

分 类 号：TH113.1[机械工程—机械设计及理论]