含脱胶压电传感器/驱动器的智能结构的有限元分析

将压电传感器、驱动器粘贴在复合材料结构的表面可实现结构的振动主动控制 ,但若传感器、驱动器部分脱开会对结构的静、动态特性产生显著影响。建立了一个新的加强假定应变压电固体单元 ,用于压电自适应层合结构振动主动控制的模拟仿真。与现有的压电固体单元相比 ,所建单元性能更优越 ,精度和计算效率更高 ,并能用于壳体结构的分析。采用相同坐标值但不同的节点号的方法模拟脱层 ,利用该单元分析了传感器、驱动器脱开对结构动力学特性的影响。

Finite Element Analysis of Smart Structures with Piezoelectric Sensors/Actuators Including Debonding

In vibration active control of composite structures, piezoelectric sensors/actuators are usually bonded to the surface of a host structure. Debonding of piezoelectric sensors/actuators can result in significant changes to the static and dynamic response. In the present paper, an novel Enhanced Assumed Strain(EAS) piezoelectric solid element formulation is developed for vibration active control of laminated structures bonded with piezoelectric sensors and actuators. Unlike the conventional brick elements, the present formulation is very reliable, more accurate, and computationally efficient and can be used to model the response of shell structures besides thin plates. Delaminations are modeled by pairs of nodes with the same coordinates but different node numbers, and numerical results demonstrate the performance of the element and the global and local effects of debonding sensors/actuators on the dynamics of the adaptive laminates.