L型耦合板结构能量传递系数特性的研究

Energy transfer coefficients' features of L-shaped coupled plates

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。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(20 rad/s^2e6 rad/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。

To study large coupled structures,such as,high speed train bodies,their energy transfer coefficients should be solved firstly when using energy methods,such as,the energy flow finite element method （EFFEM）.By using two semi-infinite plates to substitute a L-shaped coupled plate and considering flexural wave,longitudinal wave and share wave in plane simultaneously,the characteristics of wave transforming were investigated and transfer coefficients were solved at the coupled boundary by using the traveling wave method.Furthermore,the effects of incident wave＆#39;s incident angle,plate thickness and incident wave excitation frequency （20rad /s 2e6rad /s）on the wave transforming and energy transfer coefficients were analyzed.The results showed that the plate thickness and the incident wave excitation frequency have important influences on the wave transforming and energy transfer coefficients;the actions of longitudinal wave and shear wave in plane become larger with increase in plate thickness and incident wave excitation frequency,they can not be neglected.