白车身焊点电涡流检测尺寸辨识方法研究  

Study on Size Identification Method of Eddy Current Inspection for Welding Spot of White Body

作　　者：王月 凌鹤[1] 姚旭朝 WANG Yue;LING He;YAO Xuzhao(School of Mechanical and Electrical Engineering, Wuhan University of Technology, Wuhan 430070, China)

机构地区：[1]武汉理工大学机电工程学院,武汉430070

出　　处：《机械科学与技术》2022年第2期288-294,共7页Mechanical Science and Technology for Aerospace Engineering

基　　金：武汉理工大学自主创新研究基金项目(2019III146CG)。

摘　　要：本文主要对车身焊点尺寸模式识别方法进行研究,利用COMSOL仿真工具,建立电涡流传感器检测焊点的简化模型,分析焊点对涡流检测电压的影响,通过实验验证仿真结果。得到结论如下:激励频率越大,涡流趋肤深度越小,检测灵敏度越大。提离高度越大,钢板表面电涡流密度越小,检测灵敏度越低,焊点更难测量。焊点会引起检测线圈的输出电压呈凸起状态,有明显的波峰信号,焊点的尺寸越大,输出电压幅值越大。本文将检测电压曲线的时域积分和电压幅值梯度的波长宽度作为特征值,与焊点尺寸进行回归分析来辨识焊点尺寸信息,通过不同深度焊点相轨迹的频率响应来辨识焊点的深度信息。This paper mainly researches the method of pattern recognition of car body solder joint size,with COMSOL as a simulation tool to establish a model for eddy current sensor testing solder joints,the influence of the solder joints on the detection voltage is studied,and the simulation results are verified via experiments.The conclusion is as follows:the greater the excitation frequency,the smaller the eddy current skin depth,the greater the detection sensitivity.The lift-off increases,the eddy current density decreases,the detection sensitivity decreases,and the solder joints are more difficult to measure.The edge of the solder joint will cause the voltage in a convex state and cause a wave signal.The larger size of the solder joint,the greater output voltage amplitude.In this paper,the time-domain integral of the voltage curve and the wavelength width of the voltage amplitude gradient are used as the characteristic value and the solder joint size to perform regression analysis to identify the solder size information.The frequency response of the solder joint phase trajectory at different depths is used to identify the solder joint In-depth information.

关 键 词：电涡流 焊点尺寸 辨识 

分 类 号：TH16[机械工程—机械制造及自动化]