Abstract:

This paper presents result of application of spectral element method (SEM) for simulation of wave propagation in a beam structure and the crack is simulated by node separation method. Wave propagation characteristics in an aluminum beam structure are investigated. And the simulated results are compared with the analytical result from Lamb equation to validate the proposed model. The influence of cracks with different damage degrees to response signal are investigated and the damage detection method are studied. The conclusion can be useful for study of damage detection method based on Lamb wave.

Key words: vibration and wave, spectral element method, lamb wave, damage detection

摘要：

把谱元法应用于结构中弹性波的传播的模拟，建立基于二维谱元法的梁结构模型，提出模拟结构裂纹损伤的节点分离法；研究无损伤和含有损伤的铝合金梁结构中Lamb波的传播规律，通过和理论解对比，验证谱元法模拟结构中Lamb波传播的有效性；研究不同程度损伤对响应信号的影响，探讨了梁结构损伤识别方法。结果对基于Lamb波的结构损伤识别方法的研究具有借鉴意义。

关键词: 振动与波, 谱元法, Lamb波, 损伤识别