摘要
传统的TOA声发射源定位技术中,基于门槛的声波到达时间检测法在高噪声环境下会出现较大误差,从而导致损伤源定位率低、定位误差大。本文通过试验的方法研究了TOA定位技术与噪声水平之间的关系,分析了噪声影响声发射源定位的机理,采用AIC技术对高噪声环境下声波真实到达时间进行了校正,大幅提高了定位率和定位精度。该方法在铝合金试件真实疲劳试验损伤检测中进行了应用,成功在人工可见裂纹前定位出了损伤。
In the traditional TOA acoustic emission source localization technology,the threshold-based acoustic wave arrival time detection method will have a large error in high noise environments,which leads to the problem of low localization rate and large localization error of damage source.The relationship between TOA localization technology and noise level is studied by experimental method,and the mechanism of noise affecting the localization of acoustic emission source is analyzed.The AIC technology is used to correct the real arrival time of acoustic waves in a noisy environment,which greatly improves the localization rate and localization accuracy.The method is applied in the real fatigue test damage detection of aluminum alloy specimens,and the damage is successfully located before the artificial visible crack.
作者
杨海龙
祁小凤
王瑞元
王倩
杨宇
YANG Hailong;QI Xiaofeng;WANG Ruiyuan;WANG Qian;YANG Yu(National Key Laboratory of Strength and Structural Integrity,Aircraft Strength Research Institute of China,Xi′an 710065,Shaanxi,China)
出处
《工程与试验》
2024年第2期23-27,共5页
Engineering and Test
关键词
声发射
损伤定位
高噪声环境
赤池信息量准则
acoustic emission
damage location
high noise environment
AIC(Akaike information criterion)
