【作者】 贺子桐； 李仲玉； 刘逸群； 王剑锋； 杨娜；

【Author】 He Zitong;Li Zhongyu;Liu Yiqun;Wang Jianfeng;Yang Na;School of Automotive Engineering,Harbin Institute of Technology(Weihai);National Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University;

【机构】 哈尔滨工业大学(威海)汽车工程学院； 湖南大学整车先进设计制造技术全国重点实验室；

【摘要】 本文旨在研究基于Lamb波对简单平板结构损伤定位的方法,在复杂立体结构中应用的可行性,探讨在多种损伤情况下CFRP结构中损伤的定位精度,研究Lamb波在CFRP结构中散射与损伤程度的关系,为电池箱的结构健康监测奠定相关理论基础。首先,采用贝叶斯框架下椭圆轨迹法和概率加权法的概率集成方法,分析散射波信号的飞行时间和相关系数等表征CFRP损伤的信号特征,以确定基体开裂、分层、孔洞等损伤的位置。仿真结果表明,CFRP电池箱下箱体损伤影响Lamb波的传播,概率集成方法能够依据散射信号完成损伤的定位。然后,研究散射信号幅值与CFRP不同损伤程度的关系,研究结果表明,散射信号幅值的大小在一定程度上能够反映CFRP的损伤程度,道路异物对CFRP下箱体结构完整性的破坏越严重,Lamb波的散射信号幅值会越大。以上研究结果,有助于进一步量化复合材料损伤,为电池箱等汽车部件的结构健康监测提供理论指导。更多还原

【Abstract】 This article aims to study the feasibility of applying Lamb wave-based damage positioning methods to simple flat plate structures in complex three-dimensional structures,to explore the damage positioning accuracy in CFRP structures under various damage conditions,and the relationship between Lamb wave scattering in CFRP structures.The relationship between the degree of damage and the damage degree lays a relevant theoretical foundation for the structural health monitoring of battery boxes.First,the probabilistic integration method of the elliptical trajectory method and the probability weighting method under the Bayesian framework is used to analyze the signal characteristics of CFRP damage such as flight time and correlation coefficient of the scattered wave signal to determine the location of damage such as matrix cracking,delamination,and holes.The simulation results show that the damage to the box under the CFRP battery box affects the propagation of Lamb waves,and the probabilistic integration method can complete the damage localization based on the scattering signal.Then,the relationship between the scattering signal amplitude and different damage degrees of CFRP was studied.The research results showed that the scattering signal amplitude can reflect the damage degree of CFRP to a certain extent.The more serious the damage caused by road foreign objects to the structural integrity of the box under CFRP,the amplitude of the Lamb wave scattering signal will be larger.The above research results will help further quantify the damage of composite materials and provide theoretical guidance for structural health monitoring of battery boxes and other automotive components.更多还原