1 School of Mechanical Engineering, Shandong University, Jinan 250061
2 Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Shandong University), Ministry of Education, Jinan 250061
3 The Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academic of Sciences, Beijing 100190
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.
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