采用功率流有限元等能量方法研究高铁车厢等大型耦合结构的振动传递特性时，能量传递系数是必须首先要解决的关键问题之一。文章将L型耦合板结构用两耦合的半无限板代替，同时考虑了结构中传递的弯曲波、面内的纵向波和剪切波，采用行波方法对耦合边界处的波型转换进行了研究，对各传递系数进行了求解。在此基础上，讨论了入射波的入射角、板厚、入射波激励频率（20rad/s~2e6rad/s）等对波型变换和能量传递系数的影响规律，结果表明板厚和频率对波型变换有着重要影响，同时板厚和激励频率的增加会使面内纵向波和剪切波的作用越来越大，不可忽略。
Abstract
To study the large coupled structures such as high speed train bodies, the power transmission coefficients should be solved at first when using energy methods such as the energy flow finite element method (EFFEM). By using two semi-infinite plates to substitute the L-shaped coupled plate and concerning the flexure wave, longitudinal wave and share wave in plane simultaneously, the characteristics of wave transforming are investigated and the transmission coefficients are solved in coupled boundary by using traveling method. Based on the resultant formulation, the variation rule of wave transforming and transmission coefficients with the incident wave angle, plate thickness and incident wave frequency (20rad/s~2e6rad/s) are discussed in details. The results show that the plate height and incident frequency have important influence on the wave transforming and transmission coefficients. For the situation of thick plate and high incident frequency, the effect of longitudinal wave and shear wave in plane cannot be neglected, because it becomes larger and larger with the increasing of plate height and excitation frequency.
关键词
L型耦合板 /
能量传递系数 /
激励频率 /
波型转换
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Key words
L-shaped coupled plate /
Power transmission coefficient /
Excitation frequency /
Wave transforming
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参考文献
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