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基于谱有限元法发展了一种由压电晶片主动传感器(PWAS)、胶层和主结构组成的三层模型,来模拟PWAS激励结构中Lamb波的传播.首先在各层使用不同的梁理论,推导PWAS-胶层-主结构三层模型的控制方程和力的边界条件,建立谱有限元模型.通过和传统的有限单元法进行比较,表明了在显著提高计算效率的同时,所发展谱有限元模型在分析结构中Lamb波传播上仍具有较高的精度.分析了激励频率、PWAS长度与厚度、胶层厚度等参数变化对输出电压信号的影响,可以为基于PWAS和Lamb波的主动健康监测技术提供参考.
Based on the spectral finite element method, a three-layer model consisting of piezoelectric active transducer (PWAS), glue layer and main structure was developed to simulate the propagation of Lamb wave in PWAS excitation structure. Firstly, , The governing equations and force boundary conditions of PWAS-glue-host structure three-layer model were deduced and the spectral finite element model was established.By comparing with the traditional finite element method, it was shown that while the computational efficiency was significantly improved, The finite element model still has higher accuracy in analyzing the Lamb wave propagation in the analysis structure.The influence of the variation of excitation frequency, PWAS length and thickness, adhesive layer thickness and other parameters on the output voltage signal is analyzed, which can be used for PWAS and Lamb wave based active Health monitoring technology for reference.