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，本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，避免了电荷中和现象的出现。
Abstract
It is known that the polarity of PZT transducer is determined by its strain state induced by the target structure under different 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 connected with the shunt circuit. For this purpose, some typical topological structures of the electric network of the piezoelectric shunt damping system are proposed firstly. A critical analysis on the advantages and disadvantages of these networks in practical application is accomplished, based on the analysis the parallel connection is selected as the best configuration. According to the phase difference among different piezoelectric elements under this connection, a module of modal adaptation and phase shifting system is designe 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, we can avoid the neutralization of induced charges on polarized surfaces of different PZT transducers.
关键词
压电分流 /
相位调制 /
多压电元件 /
振动控制 /
网络拓扑
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Key words
piezoelectric shunt /
vibration damping /
phase shift /
network topological structure /
multiple PZT transducers
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杨智春;孙浩.
模态自适应相位调制的多压电元件压电分流系统[J]. 振动与冲击, 2011, 30(11): 90-94
Yang Zhi-chun;Sun Hao.
Piezoelectric shunt damping system with multiple transducers using mode adaptation and phase shifter[J]. Journal of Vibration and Shock, 2011, 30(11): 90-94
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