基于导波的L型焊接结构损伤检测研究

Damage detection of L-shaped welded structures based on guided wave

储罐结构作为石油化工行业重要的储存设施,对其进行实时在线检测,可以有效保障储罐的安全运行。常规导波技术常应用于正常罐底板中,对于弯曲焊接结构还缺乏深入的研究。为了解决空间受限储罐结构中底板损伤定位问题,选择在罐壁板布置线性传感器阵列,并采用基于超声导波的相控阵扇形扫描方法,对L型焊接结构进行了三维有限元建模分析和多缺陷定位实验。结果表明:波束成形后的导波在遇到弯曲焊接结构时,会发生能量的衰减和模态转换现象;扇形扫描检测方法可以实现底板区域的多缺陷准确的定位成像,检测成像的定位误差半径的均值为11.1 mm。

The structure of storage tank is an important storage facility in petrochemical industry.The real-time and online detection of storage tank can effectively guarantee the safe operation of storage tank.Conventional guided wave technology is often used in normal tank bottom, but there is a lack of in-depth research on bending welded structure.In order to solve the problem of floor damage localization in space-limited storage tank structure, a linear sensor array was selected on the tank wall, and a phased array sector scanning method based on ultrasonic guided wave was adopted to carry out three-dimensional finite element modeling analysis and multi-defect localization experiments on L-shaped welded structure.The results show that the energy attenuation and modal conversion of the beamforming guided wave will occur when it encounters the bending welded structure.The sector scanning detection method can realize accurate positioning imaging of multiple defects in the baseplate area, and the average positioning error radius of detection imaging is 11.1 mm.