超声兰姆波检测电路板缺陷的有限元仿真研究  

Research on Finite Element Simulation for Ultrasonic Defect Detection of Circuit Board

作　　者：朱妍妍 陈晓[1] ZHU Yanyan;CHEN Xiao(School of Electronic and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044)

机构地区：[1]南京信息工程大学电子与信息工程学院,南京210044

出　　处：《计算机与数字工程》2022年第6期1371-1376,共6页Computer & Digital Engineering

基　　金：国家产学合作协同育人项目(编号:202101193003,202102310005)资助。

摘　　要：为了检测电路板中的缺陷,利用有限元软件建立有限元模型,研究兰姆波与缺陷之间的相互作用。设置了四种不同板厚,依次激励汉宁窗调制的正弦波信号,提取接收信号波形参数,研究不同激励方式下不同模式在不同频厚积下的传播特性。通过设置表面缺陷和埋藏缺陷,研究超声兰姆波在缺陷处的模式转换现象,提出了在频厚积大于1MHz·mm时反对称A_(0)模式比对称S模式更适合进行缺陷检测,通过分析不同缺陷长度和宽度与反射波波峰幅值以及功率谱峰值之间的关系,在缺陷尺寸未知的情况下,可以根据时域波形的包络以及频谱推测缺陷的长度和宽度。In order to detect defects in circuit boards,a finite element model is established by using the finite element software to study the interaction between Lamb waves and defects.Four different plate thicknesses were set up to excite sinusoidal signals modulated by Hanning window successively.The waveform parameters of the received signal are extracted to study the propagation characteristics of different modes under different frequency thicknesses and different excitation modes.By setting the surface defects and buried defects to study the mode conversion phenomenon of ultrasonic lamb wave at the defects.When the frequency thickness is more than 1MHz·mm,the antisymmetric A_(0)mode is more suitable for defect detection than the symmetric Smode.Through the analysis of the relationship between different length and width of defects and the peak amplitude and power spectrum of the reflected wave.Even if the defect size is unknown,the length and width of the defect can be inferred from the envelope and spectrum of the time-domain waveform.

关 键 词：兰姆波 有限元仿真 缺陷检测 反对称A_(0)模式 

分 类 号：TP15[自动化与计算机技术—控制理论与控制工程]