【摘要】 对于半主动分支电路压电阻尼技术,目前的研究主要集中在设计某种控制,以便对压电分支电路的电器元件进行转换或改变。负电容在电路中的应用可以增大系统的机电耦合系数,用负电容电路设计半主动压电阻尼系统则是一种较新的思路,目前对这种电路的应用的研究还比较少。在用压电元件对结构进行半主动控制的研究中,本文引入了负电容压电阻尼分支电路。首先结合简支弹性梁结构建立了分支电路压电阻尼系统的模型,设计了含负电容的半主动控制系统;然后,分析了负电容的电路原理,并用H2范数优化控制理论对电阻阻值的选择进行优化计算;最后,对这种半主动系统进行了数值模拟,并与相应的被动压电阻尼系统的控制效果进行了比较,说明了此半主动控制系统控制效果的优越性。更多还原

【Abstract】 Current research on the semi-active piezoelectric shunt damping focuses on designing some control, in order to treansfer or change the components of piezoelectric shunt circuit. 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. First, the transfer function model of the system was presented based on a simple-supported elastic beam. Then, the principle of the negative capacitance circuit was analyzed. And the series resistance was chosen optimally by using the method of H2 norm optimization. At last, the semi-active control process was simulated and the results were 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.更多还原