声强测量法在发动机表面声源识别中的运用  

Application of Sound Intensity Measurement Method in Spotting the Noise Source of Engine Surface

作　　者：罗虹[1] 余文国[1] 褚志刚[1] 

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400030

出　　处：《重庆大学学报（自然科学版）》2005年第6期9-11,14,共4页Journal of Chongqing University

基　　金：重庆市科技攻关项目(2002-6644)

摘　　要：在微型客车的车外噪声控制研究中,运用声强测量原理对某微型客车发动机进行了声源识别.对发动机进行了声强测试,通过对声强等值线图的分析和频谱分析,确定了发动机主要噪声辐射源来自于油底壳、排气歧管罩和排气二分管,这些噪声主要是由发动机燃烧激励所引起的.提出了将这些壳类零件进行结构改进作为实施降噪的主要措施之一.During the study of noise emitted by accelerating mini-vehicle control, using theory of sound intensity measurement, it is actualized spotting the noise sources with the mini-vehicle engine. In the procees of the contour of sound intensity and frequency spectrum analysis, main noises of the engine are from oil sump tank and delivery menifold shield and two-way branch exhaust pipe shield. These noises are produced from the engine combustion. According to all analysis, the authors bring forward methods of modifying structure of shield-shell parts and consider them as main methods of reducing noises.

关 键 词：声强测量 发动机 声源识别 

分 类 号：O421.2[理学—声学] O421.5[理学—物理]