国防科技大学学报2018，Vol.40Issue(1)：168-175,8.DOI:10.11887/j.cn.201801026
磁致伸缩扭转导波小管径弯管检测
Inspection of small diameter bending pipes using magnetostrictive torsional guided wave
摘要
Abstract
Aiming to the problem of the inspection of small diameter bending pipes using torsional guided wave, finite element method and experiments were used to investigate the problem.ANSYS was used to simulate the propagation of torsional guided wave in bending pipe.A magnetostrictive torsional guided wave transducer was designed to inspect small diameter pipes.The exciting and receiving theoretical model of the transducer was built.The experimental signals were explained by using the theoretical model.Research results show that mode conversion happens at the elbow of the pipe and part of the T(0,1)mode converts to F(1,1)mode.The orientation of the F(1,1)mode perpendicular to the direction of extrados-intrados.The double end reflection phenomenon in inspection signal is caused by mode conversion.With the increase of frequency,the ratios between end echoes′trend towards alleviation.The longitudinal magnetostrictive forces excited by the transducer bring about small longitudinal guided wave in the signals.Conclusions will provide theoretical guide to the inspection of small diameter bend pipes using magnetostrictive torsional guided wave.关键词
磁致伸缩/T(0,1)模态导波/弯管/模态转换Key words
magnetostrictive/T(0/1)mode guided wave/bend pipe/mode conversion分类
矿业与冶金引用本文复制引用
耿海泉,王悦民,陈乐,邓文力,叶伟..磁致伸缩扭转导波小管径弯管检测[J].国防科技大学学报,2018,40(1):168-175,8.基金项目
国家部委基金资助项目(9140A27020115JB11001) （9140A27020115JB11001）
