【作者】 林学东； 田维； 黄丫； 李德刚； 刘夏；

【Author】 Lin Xuedong;Tian Wei;Huang Ya;Li Degang;Liu Xia;State Key Laboratory of Automobile Dynamic Simulation,Jilin University;

【机构】 吉林大学汽车动态模拟国家重点实验室；

【摘要】 用声强法分别测量2.4L型国产样机A(汽油机)和同娄产品国外样机B的各噪声辐射表面的声强分布特性,对比分析了两台样机各辐射表面的主要噪声源及其声强频谱特性,以及各表面的声功率及其频谱特性。结果表明,对四冲程汽油机着火频率是引起其振动噪声的主要原因。此外,尽管样机A是参照样机B设计的,两台样机的结构形状和工作条件相同,怛由于材质及结构特性上的差异,造成发动机整体结构刚度不同,使得两台样机噪声频谱特性及水平有较大的差别。因此,对应主要噪声源的频谱特性,改善发动机整体结构频率响应特性是降低噪声的重要措施之一。更多还原

【Abstract】 The sound intensity of each radiation surface of two 2.4L gasoline engines A and B were measured by using sound intensity method.Engine A and B has the same structure but different manufacture technology.This paper comparatively analyzed the main source of the noise,noise spectrum characteristic,the sound power and sound power spectrum characteristic of each radiation surface of engine A and B.Moreover,this paper predicted the effect of manufacture technology and control method on engine noise and noise spectrum characteristic based on the results of comparative analysis.The study results show that ignition frequency is one of the main reasons for gasoline engine vibration noise.Engine A and B has the same structure and work condition but different material and manufacture technology,so that the structure stiffness was affected and the noise spectrum and noise level have a greater difference.Improve the frequency response characteristic of whole engine structure correspond to the spectrum characteristic of the main noise source is an important measure to reduce engine noise.更多还原