针对在役储罐开罐检测费用高、时间长等问题,提出了一种兰姆波全聚焦成像检测方法,实现非开罐状态下金属储罐底板的腐蚀检测。首先采用仿真软件对兰姆波传播模态进行了仿真计算,根据仿真结果确定储罐底板检测所采用的兰姆波检测模态;其次开展兰姆波全矩阵数据采集及成像算法研究,建立适合储罐底板检测的兰姆波全聚焦成像算法,并开发储罐底板兰姆波检测软件系统;最后对储罐底板模拟缺陷试件进行验证试验。试验结果表明,该成像算法检测结果有效可靠。

Aiming at the problems of high cost and long time of tank opening inspection for in-service storage tanks, a Lamb wave full focus imaging inspection method is proposed to realize the corrosion inspection of the bottom plate of metal storage tanks without tank opening. Firstly, the Lamb wave propagation mode is simulated by simulation software, and the Lamb wave detection mode used for tank floor detection is determined according to the simulation results. Secondly, the research on Lamb wave full matrix data acquisition and imaging algorithm is carried out, the Lamb wave full focus imaging algorithm suitable for tank bottom plate detection is established, and the Lamb wave detection software system for tank bottom plate is developed. Finally, the simulated defect sample of tank bottom plate is tested and verified, and the results show that the imaging algorithm detection results are effective and reliable.