文献类型：期刊文献

中文题名：基于模态分离算法的管道焊缝缺陷模拟

英文题名：Simulation for Weld Defects in Pipe Based on Modal Separation Algorithm

作者：叶梦雅[1];胡明慧[1]

机构：[1]华东理工大学承压系统与安全教育部重点实验室,上海200237

年份：2017

卷号：43

期号：5

起止页码：717

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：北大核心:【北大核心2014】；CSCD:【CSCD_E2017_2018】；

基金：国家自然科学基金(51205133)

语种：中文

中文关键词：超声导波;焊缝缺陷;模态分离;L(0,2)模态;模拟

外文关键词：ultrasonic guided wave; weld defect; mode separation; longitudinal mode L （0, 2）;simulation

摘要：在温度、压力、介质腐蚀、振动等影响下,在役工业管道焊缝内部的小缺陷易发展成裂纹,对管道安全运行产生危害。在模态对称分离算法检测单焊缝管道缺陷的基础上,基于L(0,2)模态导波进行数值模拟,分别以前焊缝缺陷对称面、弯管对称面为纵坐标建立新的笛卡尔直角坐标系,根据对称原理,易于提取缺陷特征。模拟结果表明,非对称幅值与裂纹深度呈指数函数关系,该方法可以实现双焊缝和弯管焊缝缺陷的识别和定量。
With the influence of temperature, pressure, medium corrosion and vibration, small defects in theweld can be grown into cracks, which will do harm to the in-service industrial pipelines. Based on themodal symmetry algorithm of defect detection of single weld pipeline,the simulation of modal guided waves in L （0,2） is carried out. According to the symmetry principle, i t？ s easy to extract the defect features. A new Cartesian coordinate is established by using the symmetry surface of the weld defects and weld elbow as the vertical axis respectively. The simulation results show that the asymmetric amplitude is inexponential function with the crack depth,and the method can realize the identification and quantification of defects in double welds and elbows.