基于辐射噪声响度的柴油机NVH性能优化

发布时间：2018-01-20 12:52

本文关键词： 柴油机辐射噪声响度多体动力学法边界元法 NVH性能　出处：《中南大学学报(自然科学版)》2016年08期 　论文类型：期刊论文

【摘要】：分析人耳对不同频率纯音的衰减特性,提出结合人耳的衰减特性和柴油机辐射噪声的频谱特性进行响度优化的方法。运用多体动力学法和边界元法对柴油机进行声学分析,采用Moore响度模型对柴油机的辐射噪声的响度进行仿真分析。分析认为柴油机1 300~2 000 Hz的辐射噪声对柴油机响度贡献最大,通过声强法噪声源识别试验得出柴油机辐射噪声在该频段的主要贡献部件是油底壳、齿轮室罩、缸盖罩以及机体。对柴油机的齿轮室罩、缸盖罩以及机体进行结构改进,改进后柴油机的声功率级由76.4 d B下降至75.5 d B,降低0.9 d B;柴油机辐射噪声响度由161.5 sone下降到144.7 sone,降低10.4%,柴油机的NVH性能明显改善。
[Abstract]:The attenuation characteristics of human ear to pure tone with different frequencies were analyzed. A method of loudness optimization based on the attenuation characteristic of ear and the spectrum characteristic of radiated noise of diesel engine is proposed. The acoustic analysis of diesel engine is carried out by using multi-body dynamics method and boundary element method. The Moore loudness model is used to simulate the noise of diesel engine. It is considered that the radiated noise of 1 300,000Hz contributes most to the loudness of diesel engine. Through the noise source identification test of the sound intensity method, it is concluded that the main contribution components of the radiated noise of diesel engine in this frequency band are the oil bottom shell, the gear chamber cover, the cylinder head cover and the block. The structure of cylinder head cover and cylinder block was improved, the sound power level of diesel engine was reduced from 76.4 dB to 75.5 dB, and 0.9 dB was reduced. The noise noise of diesel engine decreases from 161.5 sone to 144.7 sone.The noise noise of diesel engine decreases by 10.4, and the NVH performance of diesel engine is improved obviously.
【作者单位】：浙江大学能源工程学院;
【基金】：“十二五”国家科技支撑计划重点项目(2011BAE22B05)~~
【分类号】：U464.172
【正文快照】： 随着社会的发展,汽车已经成为代步工具之一。消费者在购买汽车时,汽车的NVH(noise,vibration,harshness)性能也愈发关键[1]。发动机噪声直接关系到汽车NVH性能,近些年来有关发动机噪声控制的文献不计其数,但几乎都是以降低A计权声功率级为研究内容,发动机声品质的研究则十分罕

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