压力容器模拟缺陷的声发射定位

Acoustic emission localization of simulated defects in pressure vessels

针对核反应堆环境下压力容器的缺陷检测,为避免检测人员长时间接触辐射剂量,采用声发射检测技术,开展了压力容器模拟缺陷定位试验。根据声发射源性质的不同,分别采用时差定位法和衰减定位法,通过试验标定了两种定位方法的重要参数,实现了模拟声发射源的定位,并且通过试验验证了定位结果的准确性。试验结果表明,时差定位法和衰减定位法均适用于定位突发型声发射源,而连续型声发射源可采用衰减定位法进行定位,定位最大误差均不超过传感器间距的10%,定位效果良好。

Aiming at the defect detection of pressure vessels in the nuclear reactor environment, in order to prevent the inspectors from being exposed to radiation doses for a long time, the acoustic emission(AE) detection technology is used to carry out the experimental research of pressure vessel simulation defect location technology. According to the different characteristics of acoustic emission source, the TDOA method and attenuation location method are adopted. The important parameters of the two methods are calibrated through experiments, and the positioning of simulation acoustic emission source is realized. The accuracy of the positioning results is verified through experiments, and it is concluded that both TDOA method and attenuation location method are suitable for sudden AE source, while attenuation localization method can be used for continuous AE source. The maximum error of localization is less than 10% of the distance between the two sensors.