Abstract
When a certain electric vehicle is driving at a constant speed of 40 km/h on the rough asphalt road, the rear passenger can obviously feel the ear pressure, which seriously affects the comfort. Through the analysis of objective data, it was found that the problem was caused by the road excitation, which leads to the coupling between the mode of the backup door and the mode of the acoustic cavity, and causes the resonance of the car cavity, thus causing the ear pressure sensation. To solve this problem, this paper optimizes the backup door by means of experiment and simulation, increases the dynamic vibration absorber, makes its modal frequency avoid the acoustic cavity modal frequency, and achieves the purpose of reducing the interior noise. After optimization, the vehicle noise is reduced by 8 dBA at 42 Hz under 40 km/h working condition of rough road surface, and the ear pressure sensation is reduced at the same time, thus improving the NVH (noise, vibration, and harshness) performance of the vehicle.
Highlights
In the automotive industry, noise, vibration, and harshness is referred to as the NVH problem of automobile, which is a comprehensive problem to measure the manufacturing quality and core technology of automobile
The results show that the cause of ear-pressing sensation in the back row is the resonance between the mode of the backup door and the mode of the acoustic cavity
A series of NVH problems caused by modal coupling are very common in engineering
Summary
Noise, vibration, and harshness is referred to as the NVH problem of automobile, which is a comprehensive problem to measure the manufacturing quality and core technology of automobile. It gives the automobile users and consumers the most superficial and direct feeling. Excessive vehicle noise will reduce the sound quality in the car and negatively affect the psychology and physiology of passengers. Reducing the noise and vibration in the car has attracted widespread attention. Vibration, and harshness performance have become design standards. In terms of NVH performance, newenergy models do not have the noise masking effect of engine and other components, but the noise of road noise, wind noise, and electronic and electrical accessories is more prominent
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