基于压电传感器的单一模态Lamb波损伤检测  

Damage Detection with Single Mode Lamb Wave Based on Piezoelectric Transducers

作　　者：周凯 徐新生[1] 武湛君[1] ZHOU Kai;XU Xinsheng;WU Zhanjun(State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室

出　　处：《压电与声光》2020年第1期38-41,共4页Piezoelectrics & Acoustooptics

基　　金：国家“重点研发计划”基金资助项目(2016YFF0203002)

摘　　要：基于压电传感器的板类结构兰姆(Lamb)波损伤检测,提出了一种利用单一模态Lamb波的无基准损伤检测方法,并在铝板上进行损伤检测实验。根据压电传感器的理论模型,实验中选取单一模态Lamb波检测频率,并从含损伤板的检测信号中准确识别出损伤反射回波信号,根据损伤反射回波传播时间及对应的理论群速度,计算了损伤与传感器的距离。针对理论群速度和实际群速度差异对距离计算造成的误差,提出了一种改进的计算方法,将误差降低到3%以下。结果表明,利用单一模态Lamb波可识别结构中的损伤散射信号,并可有效计算损伤与传感器的距离。Based on the Lamb wave damage detection for the plate structures by using the piezoelectric transducers,a non-reference damage detection method using the single mode Lamb wave is proposed and a damage detection experiment on an aluminum plate is carried out.According to the theoretical model of piezoelectric transducer,the damage reflection echo signals from the detection signal of the damaged plate is accurately identified by selecting the detection frequencies of single mode Lamb wave in the experiment.The distance between the damage and the transducer is calculated through the propagation time of the damage reflection wave and the corresponding group velocity.Aiming at the error in distance calculation caused by the difference between the theoretical group velocity and the experimental group velocity,an improved calculation method is proposed,which reduces the error to less than 3%.The results show that the damage scattering signals in the structure can be identified using the single mode Lamb wave,and the distance between the damage and the transducer can be calculated effectively.

关 键 词：压电传感器 单一模态 兰姆(Lamb)波 损伤检测 传播时间 

分 类 号：TN384[电子电信—物理电子学] TM22[一般工业技术—材料科学与工程]