基于对称响应的无基准Lamb波损伤监测

兰姆(Lamb)波结构损伤监测是结构健康监测领域的研究热点.针对现有研究和应用中,基于基准响应的损伤监测方法受环境工况等条件的差异性影响问题,在分析Lamb波传播基本过程和损伤作用机理基础上,研究了基于对称响应分析的无基准Lamb波损伤监测方法.该方法通过对称布置压电阵列,实现对称响应信号的获取,进一步借助于皮尔逊相关...

Baseline Free Lamb Wave Damage Monitoring Based on Symmetric Response

The Lamb wave based structural damage monitoring is a research hotspot in the field of structural health monitoring. In order to overcome the limitation of the damage monitoring method based on benchmark is affected by the difference of environment and working conditions etc., a baseline free Lamb wave damage monitoring method based on symmetric response analysis is studied by analyzing the propagation of Lamb wave and the damage mechanism. In this method, the piezoelectric array is arranged symmetrically to obtain symmetrical response signals. Furthermore, the effective wave packets in the symmetrical response are compared and analyzed by Pearson correlation coefficient method, so as to find and locate the damage scattering signal wave packet, and then realize the damage monitoring. The experimental verification on aluminum plate structure shows that the method can directly determine the occurrence and location of damage according to the obtained responses without any benchmark signal comparison, which has certain significance for practical engineering applications.