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第 38 卷 第 2 期                                                                       Vol. 38, No. 2
             2019 年 3 月                          Journal of Applied Acoustics                    March, 2019


             ⋄ 研究报告 ⋄



                  微小层片型缺陷的超声非线性区域检测技术                                                                ∗





                                      陈振华     1,2†  肖 峰     1   陆铭慧     1   卢 超     1


                                     (1 南昌航空大学     无损检测技术教育部重点实验室          南昌   330063)
                                    (2 中国科学院声学研究所       声场声信息国家重点实验室        北京   100190)

                摘要    针对微小层片型缺陷的超声检测效率低、检测能力弱、易受主客观因素干扰的问题，提出弹簧扁钢中微
                小层片型缺陷的非线性超声区域检测技术。首先，优化探头夹持装置并提出区域检测方法，提取稳定可靠的检
                测信号；其次，提出相对非线性系数均值及波动系数表征缺陷分布；最后，基于斯皮尔曼次序相关系数分析扁
                钢各类缺陷与非线性超声系数均值的相关性。研究结果显示：两种非线性超声特征参数中的波动系数具有更
                高的缺陷敏感度，可表征扁钢中缺陷分布；波动系数与扁钢中微小层片型缺陷的相关系数比与体积型缺陷的
                相关性系数大得多，特别适用于微小层片型缺陷的检测。
                关键词     非线性超声，层片型缺陷，波动系数，相关性
                中图法分类号: TG115.28           文献标识码: A          文章编号: 1000-310X(2019)02-0200-08
                DOI: 10.11684/j.issn.1000-310X.2019.02.008





              Nonlinear ultrasonic regional detection method for testing tiny lamellar defects


                                CHEN Zhenhua  1,2  XIAO Feng  1   LU Minghui 1  LU Chao  1

                      (1 Key Laboratory of Nondestructive Testing of Ministry of Education, Nanchang Hangkong Universtiy,
                                                   Nanchang 330063, China)
                  (2 State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China)

                 Abstract  In view of the problems of low efficiency, weak detection capability, and interferences in the ul-
                 trasonic detection of tiny lamellar defects, a nonlinear ultrasonic technique for laminar defect is proposed.
                 Firstly, both the probe holding device is optimized and the regional detection method is proposed to extract
                 stable and reliable testing signal. Secondly, the relative nonlinear coefficient and the fluctuation coefficient are
                 defined to characterize the region of defect. Finally, the detection ability of nonlinear characteristic param-
                 eters is determined through analyzing the correlation between the defect of different type and the nonlinear
                 ultrasonic coefficients by use of Spearman’s correlation coefficient method. The results indicate that the fluc-
                 tuation coefficient has higher defect sensitivity and can characterize the defect distribution in flat steel. The
                 correlation coefficient between the fluctuation coefficient and the tiny lamellar defects in the flat steel is much
                 larger than that of the volumetric defects, so the fluctuation coefficient is especially suitable for the detection
                 of tiny lamellar defects but not volumetric defect.
                 Key words Nonlinear ultrasonic, Laminar defect, Fluctuation coefficient, Correlation

             2018-08-03 收稿; 2018-10-17 定稿
             国家自然科学基金项目 (11664027), 声场声信息国家重点实验室开放课题项目 (SKLA201811)
             ∗
             作者简介: 陈振华 (1982- ), 男, 江西余干人, 博士, 副教授, 研究方向: 超声波无损检测技术及其系统。
                    肖峰 (1993- ), 男, 浙江台州人, 硕士研究生, 研究方向: 超声波无损检测。
             † 通讯作者 E-mail: zhenhuachen@yeah.net
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