弹性基础梁振动的负电容控制

将电路中负电容可用来抵消压电片容抗、耗散能量的特性引入到弹性基础梁的振动控制研究中.基于Winkler基础梁建立了分支压电阻尼系统模型,设计了负电容控制系统,并用H2范数优化控制理论对阻尼进行了优化设计.通过算例证实了该系统具有较好的控制效果.与未采用负电容的结果进行比较,说明了采用负电容电路的优越性,并为探索负电容在振动控制中的应用前景提供了参考.

The Negative Capacitance Method for Vibration Control of Elastic Beam on Winkler Foundation

Negative capacitance in circuit can increase the electro-mechanical coupling coefficient of the system,and designing a semi-active piezoelectric damping system with a negative capacitance is a new thought and the correlative research is few.So,a semi-active shunt damping scheme with a negative capacitance circuit was proposed.Firstly,the transfer function model of the system is presented based on a simple-supported elastic beam on Winkler foundation.Then,the principle of the negative capacitance circuit is analyzed.And the series resistance is chosen optimally using the method of H_2 norm optimization.At last,the semi-active control process is simulated and the results are compared with the ones of the passive control.It can be seen that this semi-active control scheme can achieve much better performance and has many promising applications.