EXPERIMENTAL INVESTIGATION OF PIEZOELECTRIC SHUNT DAMPED VIBRATION CONTROL BASED ON OPTIMAL PLACEMENT

The optimal placement of PZT transducers for a piezoelectric shunt damped system are analyzed according to the vibration control of the first five modes of a clamped thin plate. The amount of electrical energy induced in the PZT transducers is adopted as the objective function of the placement optimization. To investigate the optimization criterion and the constraint conditions for the placement of piezoelectric transducers, different PZT transducers are used in four configurations of a plate with piezoelectric shunt damped system. Based on the placement optimization analysis, experiments for the vibration control of the thin plate are conducted with a RL series shunt circuit. The vibration suppression results of the optimized piezoelectric shunt damped system are compared with those of the non-optimized system for each configuration and the experimental results validate the effectiveness of piezoelectric shunt damped systems in controlling vibration responses of the first five modes of the plate. After the piezoelectric shunt circuit is closed and the shunt damping is in action, the amplitudes of the transfer functions at the first five natural frequencies drop about 11.90 dB, 16.94 dB, 16.94 dB, 19.91 dB and 16.77 dB, respectively. Furthermore, it is also verified that the use of optimal placement of piezoelectric transducers can effectively enhance the vibration control effect of piezoelectric shunt damped system.