论文部分内容阅读
应用ANSYS软件对压电智能结构建模,并计算其模态圆频率。采用D优化设计准则,并对该准则进行简化,用一种简单的方法将所选择的低阶模态振型转化为归一化形式,最后,仅用结构模态振型就可确定压电元件的最优位置,有效的避免了布置的随机性。考虑到粘贴压电元件对主体结构动力学特性的影响,该文采用线性二次型高斯(LQG)最优控制方法,设计Kalman滤波器,对模型过程噪声和量测噪声进行过滤。最后,该文以压电智能悬臂梁为例给出了系统的阶跃响应曲线,验证了此方法的有效性。
The piezoelectric intelligent structure was modeled with ANSYS software and its modal circular frequency was calculated. Using D-optimized design criteria, and simplifying the criterion, a simple method is used to convert the selected lower-order modal form into a normalized form. Finally, the piezoelectric modes can be determined using only structural mode shapes The optimal location of the components effectively avoids the randomness of the layout. Considering the influence of the bonded piezoelectric element on the dynamic characteristics of the main structure, a Kalman filter is designed by using the linear quadratic Gaussian (LQG) optimal control method to filter the model process noise and measurement noise. Finally, a step response curve of the piezoelectric smart cantilever is given in this paper, which verifies the effectiveness of this method.