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线弹性位移不连续模型难以准确描述应力波穿过厚度较大的宏观结构面的传播过程,对结构面透射侧的位移分量和应力分量进行多次泰勒展开,建立改进线弹性位移不连续模型,运用原模型和改进模型测试结构面弹性模量,研究阻抗比和结构面厚度对测试误差的影响,研究结果表明:当阻抗比较小时,应选择改进模型,基于反射波的波形差异测试结构面弹性模量;当阻抗比较大时,应选择原模型,基于透射波的波形差异测试结构面弹性模量;数值模拟得到测点振动波形,分析结构面厚度对测试偏差的影响,随结构面厚度增加,基于改进模型反射波波形差异的测试偏差减小,基于原模型透射波波形差异的测试偏差增加,现场试验与数值模拟的结果是一致的。
The discontinuous linear elastic displacement model can not accurately describe the propagating process of stress wave through the macrostructural plane with thicker thickness. The Taylor series expansion of the displacement and stress components on the transmission side of the structural plane is carried out. The discontinuous discontinuity model of elastic linear displacement is established, The original model and the improved model are used to test the elastic modulus of the structural plane. The influence of the impedance ratio and the thickness of the structural plane on the test error is studied. The results show that when the impedance is relatively small, the improved model should be selected and the structural plane elasticity Modulus; When the impedance is relatively large, the original model should be selected, the elastic modulus of the structural surface is tested based on the waveform difference of the transmitted wave; the vibration waveform of the measured point is obtained by numerical simulation; the influence of the structural surface thickness on the test deviation is analyzed; , The test deviation based on the difference of the waveform reflected by the improved model is reduced, and the test deviation based on the difference of the waveform of the transmitted waveform of the original model is increased. The results of the field test and the numerical simulation are consistent.