管结构导波频散曲线绘制与试验验证  

EXPERIMENTAL VALIDATION AND PLOTTING GUIDED WAVE DISPERSION CURVE OF PIPE STRUCTURE

作　　者：阎石[1,2] 何彬彬 赵乃志[1,2] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]大连理工大学建设工程学部,辽宁大连116024

出　　处：《工程力学》2012年第A02期159-163,共5页Engineering Mechanics

基　　金：辽宁省高校重点实验室支持计划项目(2008S189)

摘　　要：从理论上分析了管道结构中三种模态簇导波的传播特性。根据推导出导波的频散方程,通过数值方法绘制出了导波的频散曲线。利用试验验证了所建立的频散曲线的有效性。在两种不同截面尺寸的管道中进行激励70kHz-200kHz范围内的纵向模态试验,结果表明L(0,2)在管结构中传播速度与理论值较吻合,对利用超声导波对管道进行无损检测具有一定实际指导意义。The paper theoretically analyzed the propagation characteristics of three modal guided waves in a pipeline structure. According to a deduced guided wave dispersion equation, dispersion curves of guided waves were drawn out by a numerical method. Experiment verified the validity of the established dispersion curves. In two pipes with different sectional dimensions, the guided waves of a longitudinal mode whose frequency range from 70kHz to 200kHz were excited at the end of the pipe, and the results show that the propagation velocity of L（0,2） mode in the pipe was closed to a theoretical value, these has a certain practical significance on nondestructive tests of pipelines by using ultrasonic guided waves.

关 键 词：管道结构 超声导波 纵向模态 频散方程 频散曲线 群速度 相速度 

分 类 号：TU392.3[建筑科学—结构工程] TM282[一般工业技术—材料科学与工程]