Abstract
A new SEA method is developed in this paper to analyze the vibration and noise radiation from the complicated coupled systems. Firstly, some elements influence the energy transmission between the two coupled mechanical structures are separated and corresponding parameters are introduced to investigate those influences separately. Linking style coefficient is introduced to denote the rule of vibration energy transmission when structures are linked by one point, some points or a line. Non-conservative coupling coefficient is introduced to describe the influence of isolation or damping when structures are isolated or damped. Indirect coupling coefficient is introduced to research the property of vibration energy transmission when two structures are indirectly linked by other structure. Secondly, on the basis above, the gradation analysis is put forward to simplify the vibration analysis of complicated coupled system. Thirdly, vibration and noise radiation from an underwater vehicle is analyzed by the developed SEA. Levels of vibration and sound power induced by the underwater vehicle are predicted. The analysis results agree well with the experiment results. Finally, based on the analysis, the way to control the noise from the vehicle is pointed out.
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