In order to predict the interior noise of the automobile in the low and middle frequency band in\r\nthe design and development stage, the hybrid FE-SEA model of an automobile was created using\r\nhybrid FE-SEA method. The modal density was calculated using analytical method and finite\r\nelement method; the damping loss factors of the structural and acoustic cavity subsystems were\r\nalso calculated with analytical method; the coupling loss factors between structure and structure,\r\nstructure and acoustic cavity were both calculated. Four different kinds of excitations including\r\nroad excitations, engine mount excitations, sound radiation excitations of the engine, and wind\r\nexcitations are exerted on the body of automobile when the automobile is running on the road. All\r\nthe excitations were calculated using virtual prototype technology, computational fluid dynamics\r\nCFD, and experiments realized in the design and development stage. The interior noise of the\r\nautomobile was predicted and verified at speed of 120 km/h. The predicted and tested overall\r\nSPLs of the interior noise were 73.79 and 74.44 dBA respectively. The comparison results also\r\nshow that the prediction precision is satisfied, and the effectiveness and reliability of the hybrid\r\nFE-SEA model of the automobile is verified.
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