【作者】 霍林生； 王靖凯；

【Author】 Huo Linsheng;Wang Jingkai;Dalian University of Technology;

【机构】 大连理工大学；

【摘要】 声发射技术作为一种常用的结构健康监测技术,已经被广泛的应用于结构损伤的检测和定位。在常用的声发射定位方法中,到达时间差是影响定位精度的关键因素。但是,到达时间差容易受到噪声信号的影响。针对这个问题,本文提出了一种基于同步压缩小波变换(SWT)的到达时间点拾取方法。SWT拾取方法利用时频相似点替代到达时间点计算时间差。时频相似点的选取范围为声发射信号中信噪比较高的部分,可以有效降低噪声信号对到达时间点拾取的干扰。数值分析与管道实验的结果证明了SWT拾取方法的有效性。更多还原

【Abstract】 Acoustic emission(AE) technique,as a common health monitoring technique,has been widely applied to detecting and locating structural damage.Among the AE localization methods,the time difference of arrival is the key factor.However,the time difference of arrival is susceptible to noise.To solve this problem,this paper proposes a time arrival point picking method based on synchrosqueezed wavelet transforms(SWT).In the SWT picking method,time-frequency similar points are used to replace the time arrival points for calculating the time difference of arrival.The picking area of time-frequency similar points is in the part with high SNR of the AE signal,which can effectively reduce the influence of noise.The results of numerical analysis of typical AE signal and steel pipe experiment verified the SWT picking method.更多还原