基于AIC信息准则的Delta T声发射源定位方法

Delta T Acoustic Emission Source Localization Method Based on Akaike Information Criterion

疲劳断裂是金属结构中的主要失效形式,而金属结构中的早期疲劳断裂信号通常难以检测。TOA方法是常用的声发射定位源方法,但是声波传播过程中波速变换和路径的复杂性对其结果影响很大。运用Delta T声发射源定位方法,用断铅实验模拟声发射源,用AIC信息准则对到达时间进行优化,通过使用差值求源点坐标和图像处理的方法,求得声发射源坐标。通过在平板上的实验,比较两种源定位方法在不同结构中的定位结果,分析定位误差,结果表明图像处理方法更为优秀。

Fatigue fracture is the main failure mode in metal structures,it is difficult to detect early fatigue fracture signals in metal structures.The TOA method is an acoustic emission localization method commonly used,but the complexity of the wave velocity transformation and path in the acoustic wave propagation has a great influence on the result.This paper uses the Delta T acoustic emission source localization method to simulate the acoustic emission source by pencil lead breaking experiment,optimize the arrival time according to the AIC information criterion and find the source point coordinates by using the difference and image processing method.It also makes the experiments on the plates,compares the positioning results of two source positioning methods and analyzes the positioning errors.It comes to the conclusion that the image processing method is more excellent.