Active-Passive Method for Optimizing Circuit Parameters of a Piezoelectric Vibration Damping System Based on Negative Capacitance

In the vibration control system based on the negative capacitance piezoelectric damping,the negative capacitance circuit parameters have great influences on the vibration amplitude and cannot be automatically adjusted to adapt the environment changes.Aiming at these problems,this paper presents an active-passive method,which can transform the adjustive problem of the negative capacitance circuit parameters to the active control algorithm.First,the active-passive principle is derived according to the equivalent circuit of piezoelectric film.The active controller parameters adjustment process is described based on the binary search algorithm.Finally,the experimental platform that is an alloy rectangular thin plate clamped with the stiff base is set-up using the dSPACE1104 real-time simulation platform and the elements of analog circuit and piezoelectric.The active-passive method is studied in the experiment plat.Experimental results show that this method is able to adjust the negative capacitance circuit parameters and achieve optimal values.Furthermore,the control performance is better than the individual control method using active control or passive control under the same conditions.