基于ATV的车内低频噪声贡献量分析与改进

在研究汽车车内噪声的过程中,判断低频噪声的主要来源和降低车内低频噪声水平是一个难点。运用声传递向量（ATV）技术,以某轿车为例,建立车内声学空腔边界元模型,对车内低频噪声进行仿真;通过对声传递向量以及声压频响函数的计算,进一步对低频段的噪声贡献量分析,为判断低频噪声的主要来源提供了一种分析方法。选取车内驾驶员右耳畔声压响应的6个峰值点,采用幅值—相位图对场点声压进行模拟,对车身板件声学贡献量进行排序,发现防火墙和前挡风玻璃的结构振动对车内低频噪声的产生可能有重要影响,为进一步的改进提供一定的参考依据。改进设计后,车内低频噪声水平得到一定程度抑制。

Analysis & Improvement of Vehicle Interior Low-Frequency Noise Contributions Base on ATV

To predict the major sources of low-frequency noise and reduce it are recent difficulties in researching the ve-hicle interior noise.The BEM model of interior acoustic cavity of an auto was built and simulation of the interior low-fre-quency noise was made by using the method of ATV.A predicting method of low-frequency noise is provided by calculat-ing the acoustic transfer vector and acoustic pressure frequency response function,the low-frequency range contribution analysis was made.By simulating of field-point acoustic pressure using amplitude-phase chats of 6 extreme points of the pressure response function,the ranking of the panel-contribution was known.An inference was made for further optimiza tion that the firewall and the windshield vibration play very important roles in low frequency noise contributions.The ve hicle interior low-frequency noise was reduced in some extent after improvement.