噪声与振动控制2017，Vol.37Issue(3)：112-116,5.DOI:10.3969/j.issn.1006-1355.2017.03.022
偏相干分析在客车降噪中的应用
Application of Partial Coherence Analysis in Interior Noise Reduction of Passenger Cars
摘要
Abstract
Interior low-frequency noise has been the focus of automotive NVH research. It is necessary to detect and improve the vibrating structures that have great impact on the interior noise. However, contribution of vibration to the noise of field points is unlikely to completely represent the contribution to the whole interior acoustic field. For the interior acoustic field with multiple frequency peaks and multiple field points, the"total coherence coefficient"and"coherence coefficient sum"are introduced as two new parameters to improve the existing partial coherence analysis method. Then, the interior noise of a passenger car is analyzed by wavelet packet decomposition. The acoustic characteristics of the interior acoustic field and the concerned frequency range are obtained. Through the partial coherence analysis of the vibration of panels and interior noise signals at the measurement points, the structures which have greater impact on the interior noise are identified. And the improvement measures are carried out for the car. The results of the test show that the sound pressure level of the interior noise of the field points is reduced by 0.5 dB-2 dB. This work provides the guidance for reducing the interior noise of passenger cars.关键词
声学/总相干系数/偏相干分析/低频噪声/小波包分解Key words
acoustics/total coherence coefficient/partial coherence analysis/low-frequency noise/wavelet packet decomposition分类
通用工业技术引用本文复制引用
王茜影,谢小平,李阳,杨悦,王晨辉..偏相干分析在客车降噪中的应用[J].噪声与振动控制,2017,37(3):112-116,5.基金项目
国家自然科学基金重点项目资助(11232004) （11232004）
中国新能源汽车产品检测工况研究和开发项目-长沙资助项目 （）
