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.
2011, Vol. 30 
