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工程力学  2012 

管结构导波频散曲线绘制与试验验证

DOI: 10.6052/j.issn.1000-4750.2011.11.S046, PP. 159-163

Keywords: 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

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Abstract:

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。

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