作者：张亚建1, 毛虎平1, 程意2, 王瀚岑1, 李煜华1
作者单位：1. 中北大学能源动力工程学院, 山西 太原 030051;
2. 中北大学机械工程学院, 山西 太原 030051
关键词：声压;无损检测;模态;连杆;缺陷
摘要：
为实现工业生产流水线产品的快速无损检测，结合结构动力学理论和声辐射模态理论，论述声辐射模态频率作为无损检测依据的可行性，提出一套基于声压的无损检测方案。该方案结合使用Matlab和高精度麦克风、工业声卡等硬件设备实现声音信号采集、FFT变换和模态识别等功能。以长安CS55发动机连杆为例进行试验，结果与Ansys仿真结果对比验证此试验方案的准确性。最后对上述连杆进行无损检测，通过对大量连杆进行重复试验的结果对比发现：利用声压的无损检测方案可以成功检测缺陷连杆，而且检测结果较为稳定。
Research on nondestructive testing method based on sound pressure
ZHANG Yajian1, MAO Huping1, CHENG Yi2, WANG Hancen1, LI Yuhua1
1. School of Energy and Power Engineering, North University of China, Taiyuan 030051, China;
2. School of Mechanical Engineering, North University of China, Taiyuan 030051, China
Abstract: In order to achieve fast and nondestructive testing of products in industrial production line, combined with structural dynamics theory and sound radiation theory, the feasibility of sound mode as the basis of NDT is discussed, and a set of NDT scheme based on sound pressure is put forward. This program combines the Matlab software and high-precision microphone, industrial sound card and other hardware devices to achieve the functions of sound signal acquisition, FFT change, spectrum analysis, modal identification and so on. Taking the Chang'an CS55 engine connecting rod as an example, the test results are compared with the Ansys simulation results to verify the accuracy of the test scheme. Finally, the NDT is applied to the above connecting rod. Through comparing the results of repeated tests on a large number of connecting rods, it is shown that the NDT scheme using sound pressure can successfully detect the defective connecting rod, and the result is stable.
Keywords: sound pressure;nondestructive testing;mode;connecting rod;defect
2019, 45(1):8-13 收稿日期: 2018-01-30;收到修改稿日期: 2018-03-23
基金项目: 国家自然科学基金项目（51275489）；山西省自然科学基金项目（201701D121082）
作者简介: 张亚建(1993-),男,山西大同市人,硕士研究生,专业方向为声共振无损检测
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