聚乙烯管道电熔接头缺陷超声相控阵成像模拟和实验研究

Simulation and experimental verification of ultrasonic phased array imaging technology for electrofusion joint defect detection in polyethylene pipes

为了快速获得电熔接头超声成像图以便研究聚乙烯管道电熔接头无损评估算法研究,运用了多物理场耦合有限元分析软件COMSOL Multiphysics对聚乙烯管道电熔接头金属电热丝的超声响应特性进行了有限元分析,并对聚乙烯管材内壁钻孔缺陷及含孔洞缺陷聚乙烯管道电熔接头进行了超声相控阵检测成像实验,验证了超声相控阵检测成像有限元模拟分析结果的正确性。采用Richardson-Lucy反卷积算法对聚乙烯管材内壁钻孔缺陷超声相控阵成像图进行了图像复原处理。实验结果表明:基于超声傅里叶成像的相控阵成像仿真方法具有可行性,有限元模型为聚乙烯管道电熔接头缺陷超声相控阵成像提供了数值模型。

Inorder to quick achieve the ultrasonic images for algorithm development of Polyethylene pipe nondestructive evaluation,a finite element（FE） model was built to simulate ultrasonic response of heating wire in PE pipe electrofusion joints by using multi-physics coupling finite element analysis software COMSOL Multiphysics,the defected PE pipe with drilling hole and electrofusion joints with pore were tested by an ultrasonic phased array（UPA） imaging system for the verification of the FE model.The UPA images of defected PE pipe with drilling hole were processed by Richardson-Lucy deconvolution algorithm.The results indicate that the feasibility of simulation of UPA imaging based on Fourier transform.The FE model could provide the numerical model for UPA imaging of electrofusion joint defect in polyethylene pipes.