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| Tests for noise reduction of car body cavity barrier structure |
| ZHANG Lijun1,2,WANG Ziyi1,2, MENG Dejian1,2 |
1. College of Automotive Studies, Tongji University, Shanghai 201804, China;
2. Collaborative Innovation Center for Intelligent New Energy Vehicle, Shanghai 201804, China |
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Abstract The test study methods were systematically established for noise reduction of car body cavity barrier structure. Variations of body-in-white modal features and transfer function with and without barrier structure were measured to analyze barrier structure’s suppression ability against car body low-frequency noise. The drum test method for noise reduction performance of the whole vehicle barrier structure was built to estimate barrier structure’s suppression ability against engine noise and tire/road surface noise. The wind tunnel test method for noise reduction performance of the whole vehicle barrier structure was built to estimate barrier structure’s suppression ability against aerodynamic noise. The test results showed that cavity barrier structure reducing interior noise has two aspects; on one hand, cavity barrier structure enhances car body’s modal damping to suppress car body’s vibration and reduce interior low-frequency noise; on the other hand, barrier structure cuts off the propagation path of noise from outside of vehicle through car body’s side cavity to invade passenger compartment so as to reduce interior high-frequency noise.
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Received: 25 March 2019
Published: 28 December 2019
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