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双层管结构中扭转模态传播特性的理论分析与实验研究
引用本文:刘增华,何存富,吴斌,杨士明,王秀彦.双层管结构中扭转模态传播特性的理论分析与实验研究[J].工程力学,2006,23(11):170-176.
作者姓名:刘增华  何存富  吴斌  杨士明  王秀彦
作者单位:北京工业大学机电学院,北京,100022
基金项目:国家自然科学基金;北京市教委科技发展计划项目
摘    要:通过分析不同的应力和位移边界条件得到了三种不同双层管结构中扭转模态的频散方程。不同结构中频散方程的阶次也不相同。并进行数值求解,得到相应的频散曲线。对不同双层管结构中扭转模态尤其是T(0,1)模态的主要传播特性进行了分析。然后,利用厚度剪切压电陶瓷片分别在这三种不同的管结构中进行了激励接收扭转模态的实验。实验结果与理论分析较为吻合。结果表明,利用全局矩阵法可以得到不同双层管结构的扭转模态频散方程,并且其频散曲线可用作模态选取的理论指导,用于这些管结构的缺陷检测。

关 键 词:导波  扭转模态  双层管结构  频散  衰减
文章编号:1000-4750(2006)11-0170-07
收稿时间:2005-03-17
修稿时间:2005-03-172005-06-06

THEORETICAL AND EXPERIMENTAL RESEARCH ON PROPAGATION CHARACTERISTICS OF TORSIONAL MODES IN TWO-LAYER PIPES
LIU Zeng-hua,HE Cun-fu,WU Bin,YANG Shi-ming,WANG Xiu-yan.THEORETICAL AND EXPERIMENTAL RESEARCH ON PROPAGATION CHARACTERISTICS OF TORSIONAL MODES IN TWO-LAYER PIPES[J].Engineering Mechanics,2006,23(11):170-176.
Authors:LIU Zeng-hua  HE Cun-fu  WU Bin  YANG Shi-ming  WANG Xiu-yan
Affiliation:Beijing University of Technology, Beijing 100022, China
Abstract:Dispersion equations of torsional modes in three different two-layer pipes are obtained by means of analyzing different stress and displacement boundary conditions of these structures.It is found that the orders of dispersion equations vary with these pipe structures.All these equations are solved numerically.As a result,torsional mode dispersion curves of these three structures are shown respectively.Main propagation characteristics of torsional modes,especially T(0,1)mode are analyzed.Torsional modes in these different structures are excited and received using thickness shear mode piezoelectric transducers in the experiment.Experimental results are in good agreement with theoretical results.The results show that torsional dispersion equations of different two-layer pipes can be developed using the global matrix method,and their dispersion curves provide some theoretical guidance of mode choice for defect detection in these pipe structures.
Keywords:guided waves  torsional mode  two-layer pipe  dispersion  attenuation
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