Abstract:

Both the passive and the active piezoelectric vibration methods are of poor performance because the former is of some branch circuit parameters sensitive to environmental changes and a complex branch circuit and the latter requires higher input power. In order to solve these problems,an active-passive hybrid control method is proposed based on the piezoelectric branch circuit with negative capacitance and the adaptive algorithm with wavelet transform. The authors describe the principle of the hybrid control method and analyze the influences of negative capacitance value on the passive control effect and the active control voltage. Simulated and experimental results show that the hybrid control method effectively suppresses the structural vibration and is more effective than the individual active or passive control method.

Key words: negative capacitance, active-passive hybrid control, piezoelectric materials, electro-mechanical coupling coefficient, wavelet transform