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第 40 卷 第 5 期                                                                       Vol. 40, No. 5
             2021 年 9 月                          Journal of Applied Acoustics                 September, 2021

             ⋄ 研究报告 ⋄



                         不锈钢折弯板裂纹Lamb波检测技术                                                     ∗






                                        胡晓丹 周世圆            †   赵明华 于全朋


                                (北京理工大学机械与车辆学院         先进加工技术国防重点学科实验室          北京   100081)

                摘要：金属弯板广泛应用于车辆、船舶、飞机等大型装备结构件中，折弯处易形成应力集中产生裂纹，直接影响
                构件的使用安全和寿命。该文开展了不锈钢弯板裂纹缺陷 Lamb 波检测技术研究，计算了钢板的频散曲线，优
                选 3 种不同频率的 S0 模态：0.25 MHz、0.5 MHz、1 MHz。利用 COMSOL 仿真软件建立频域仿真模型，模拟了
                Lamb 波在 3 mm 厚 “L” 形弯板内部的传播情况。开展折弯板裂纹缺陷检测实验，并使用小波包变换的方法对
                实验信号进行分析。结果表明：经小波包变换后，0.25 MHz、0.5 MHz、1 MHz 的 S0 模态 Lamb 波均可用于裂
                纹缺陷的识别检测。
                关键词：Lamb 波；裂纹检测；COMSOL 仿真；小波包变换
                中图法分类号: TB553           文献标识码: A          文章编号: 1000-310X(2021)05-0785-09
                DOI: 10.11684/j.issn.1000-310X.2021.05.018





                  Detection of crack defects in stainless steel bending plates on Lamb wave



                               HU Xiaodan ZHOU Shiyuan ZHAO Minghua YU Quanpeng


                    (National Key Laboratory of Advanced Processing Technology, School of Mechanical and Vehicle Engineering,
                                        Beijing Institute of Technology, Beijing 100081, China)

                 Abstract: Metal bending plates are widely used in large equipment structures such as vehicles, ships, and
                 airplanes. Stress concentration is easily formed at the bend and cracks are generated, which directly affects the
                 safety and life of the components. In this paper, the Lamb wave detection technology for cracks in stainless
                 steel bending plates is studied. The dispersion curve of the steel plate is calculated, and the S0 modes of
                 1 MHz, 0.5 MHz and 0.25 MHz are optimized. The COMSOL simulation software was used to establish a
                 frequency domain simulation model to simulate the propagation of Lamb waves in a 3 mm thick “L”-shaped
                 benting plate. The crack defect detection experiment of the benting plate was carried out. And the wavelet
                 packet transform method was used to analyze the experimental signal. The results show that after wavelet
                 packet transform, 0.25 MHz, 0.5 MHz and 1 MHz S0 mode Lamb waves can be used for the identification and
                 detection of crack defects.
                 Keywords: Lamb wave; Crack detection; COMSOL simulation; Wavelet packet transform




             2020-12-12 收稿; 2021-03-14 定稿
             装备预研重点实验室基金项目 (61420030201)
             ∗
             作者简介: 胡晓丹 (1995– ), 女, 河北张家口人, 硕士研究生, 研究方向: 超声导波无损检测。
             † 通信作者 E-mail: redaple@bit.edu.cn
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