压电智能驱动器力学模型的建立及数值模拟

基于PZT逆压电效应和结构动力学波动原理,建立粘贴式PZT驱动器与主体结构耦合简化力学模型及数学模型;考虑粘结层阻尼效应,建立PZT驱动方程并求解输出力表达式,确定驱动器力学与电学特性的对应关系;通过胶层材料特性、传递的切应力及其厚度变化对PZT驱动性能的影响进行算例分析,拟合出胶层传递剪切力与胶层厚度关系曲线,证明了运用所建立的驱动模型能有效地模拟检测PZT的逆压电规律,可为利用压电智能驱动器控制工程结构检测提供理论依据.

Mechanical Modeling and Numerical Simulation on Piezoceramic-based Smart Aggregate Actuator

We present mechanical and mathematical modeling, theoretical analysis and numerical simulation of the coupling modeling between the bonded PZT actuator and the main structure by the inverse piezoelectric effect and vibration principle of structure dynamics,respectively. In this study,a PZT patch is bonded on the surface structure. The equations of motion for PZT actuator are derived and then the output force expression is obtained in consideration of bonding layer-damping effect. The correspondence relation between the mechanical and electrical properties of PZT actuators is further determined. The influence of adhesive material properties,the transfer of shear stress and its thickness on the driving performance of PZT actuator is analyzed by the numerical example. The relationship curve between the shear force and adhesive layer thickness is obtained by fitting method. The results showed that the combining theoretical and numerical are conducted to validate the efficiency of the developed model and effectively simulate and detect inverse piezoelectric rule of PZT actuator, which provide theoretical basis for engineering structure detection technology by employing of piezoelectric smart actuator.