压电陶瓷在锥形圆筒振动主动控制中的应用

Active Vibration Control of a Conical Shell Using Piezoelectric Ceramics

锥形圆筒结构被广泛应用在船舶、航天器等工程系统中,减小其振动具有重要意义。以单端固定的锥形圆筒为研究对象,将压电陶瓷粘贴在圆筒表面分别作为传感器及作动器组成减振装置。通过有限元方法得到结构固有频率及振型信息,并采用模态实验分析对仿真结果进行验证,仿真及实验结果相一致。根据结构的振动特性,设计多模态模糊滑模控制器对锥形圆筒各阶模态振动分别进行主动控制研究,得到时域及频域下实验结果,对比实验结果表明减振方法的可行性。

Conical shell structures are commonly used in many engineering systems such as marines and spacecraft. Vibration suppression is an important problem in this application. In this study, a conical shell with piezoelectric actuators/sensors is considered in active vibration control. Finite element analysis is performed to get the natural frequencies and mode shapes of the structure. A modal test is carried out to verify the finite element analysis results. Both the results of natural frequencies are consistent. Then, according to the modal characteristics, a multi- modal fuzzy sliding mode controller is designed for the active vibration control test. The test results in time and frequency domains show that this controller is effective.