车辆结构噪声传递特性及其峰值噪声成因的分析

doi:10.19562/j.chinasae.qcgc.2018.012.012

摘要/Abstract

摘要： 本文对发动机怠速工况下车身结构噪声的传递特性和峰值噪声的成因进行研究。采用力锤敲击法,测量从悬置被动侧加速度至驾驶员右耳的噪声传递函数,导出从加速度至声压的传递函数,再根据发动机怠速下悬置被动侧的加速度激励,高精度合成了驾驶员右耳处的总声压并研究路径传递噪声的贡献。结果表明,总声压是频域中所有路径传递声压的叠加,与路径传递声压的幅值与相位均有关,路径传递声压对总声压的贡献有正负之分。最后识别出主要的传声路径,并利用动刚度曲线、噪声传递函数曲线和悬置的加速度谱,对路径的峰值噪声成因进行了分析。

关键词: 车辆, 结构噪声, 传递特性, 声压贡献, 峰值噪声

Abstract: The transfer characteristics of structure-borne noise and the cause of its peak noise of vehicle body in engine idle condition are analyzed in this paper. Hammer impact is used to measure the noise transfer function (NTF) from the acceleration of passive side of engine mounts to the right ear of driver,and the transfer function from acceleration to sound pressure is deduced. Then based on the acceleration excitation of passive side of engine mounts in engine idle condition, the total sound pressure at driver's right ear is accurately composed and the contribution of path transmission noise is investigated. The results show that the total sound pressure is the superposition of transfer sound pressures of all paths in frequency domain, which are related to both amplitudes and phases, and the path transfer pressures have both positive and negative contributions to the total sound pressure. Finally the main paths of sound transmission are identified,and the dynamic stiffness curves, the noise transfer function curves and the acceleration spectrum of engine mounts are used to analyze the cause of peak noise of all paths.

Key words: vehicle, structure-borne noise, transfer characteristics, sound pressure contribution, peak noise

王永亮, 刘浩, 郑卿卿, 罗挺, 徐艳平, 邓峰, 周权, 周副权. 车辆结构噪声传递特性及其峰值噪声成因的分析[J]. 汽车工程, 2018, 40(12): 1461-1466.

Wang Yongliang, Liu Hao, Zheng Qingqing, Luo Ting, Xu Yanping, Deng Feng,
Zhou Quan, Zhou Fuquan. Analysis on the Transfer Characteristics of Vehicle Structure-borne Noise and the Cause of Its Peak Noise[J]. , 2018, 40(12): 1461-1466.

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