负电容在主-被动混合压电振动控制中的应用

Application of Negative Capacitance to Active-Passive Hybrid Piezoelectric Vibration Control

针对压电被动振动方法中分支电路参数环境适应能力差、电路复杂和压电主动振动方法需要较高输入功率的问题,提出了一种基于负电容压电分支电路和小波变换自适应算法的振动主-被动混合控制策略.文中阐述了这种主-被动混合振动控制方法的原理,分析了被动控制效果、主动控制电压与负电容参数的关系.仿真和实验结果表明,这种主-被动混合振动控制方法能够有效抑制结构振动,其控制效果优于单独的主动控制或被动控制.

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.