Optimization of damping and absorbing performance of shunted piezo elements utilizing negative capacitance

In this paper, the effect of negative capacitance in damping and absorbing systems using shunted piezoelectric transducers is analyzed. Different passive and semi-active configurations of networks have been compared in a general, normalized form, highlighting the influence of the general electromechanical coupling coefficient and the negative capacitance. Commonly used criteria for passive networks are adapted to the general configuration with negative capacitance resulting in optimal parameters. The damping and absorbing performance of optimal passive and semi-active networks are compared. With optimal parameter for negative capacitance, an upper limit for maximum appearing amplitude in the frequency response function (FRF) can be given. Results are verified experimentally using a test rig.