结合多种方法进行六缸柴油机噪声源识别研究  

Study on Noise Source Identification of Six Cylinder Diesel Engine Using Manifold Methods

作　　者：任武超[1] 罗浩锋[1] 潘虹[1] 韩义勇[1] 卫海桥[2] 

机构地区：[1]广西玉柴机器股份有限公司技术中心,玉林537005 [2]天津大学内燃机燃烧学国家重点实验室

出　　处：《内燃机工程》2008年第2期66-70,共5页Chinese Internal Combustion Engine Engineering

基　　金：天津市自然科学基金项目(07JCYBJC03700)

摘　　要：针对六缸柴油机进行了噪声源识别和降噪研究工作。通过单缸熄火法进行燃烧噪声和机械噪声的分离,以及表面振动法和声学照相法,结合振动和噪声信号的频谱分析法,对发动机表面辐射噪声进行了识别;针对表面噪声辐射的主要噪声源采取了屏蔽措施。研究结果表明:六缸柴油机的主要噪声源为机械噪声,通过对齿轮室罩盖、气缸盖罩盖、充电电机外壳和喷油泵等薄壁件采取屏蔽措施,或者进行结构优化,能有效降低整机噪声。The noise source identification and noise reduction of a six-cylinder diesel engine are investigated. The combustion noise and mechanism noise is separated through the method of single cylinder misfire. The surface radiation noise sources are identified by surface vibration analysis and acoustic camera analysis in combination of the spectrum analysis of vibration and noise. The total engine noise is reduced by adopting the shield technique for the primary surface radiation noise sources of the engine. The results show that the mechanism noise is the primary noise source of this six cylinder diesel engine. The total engine noise can be reduced availably by adopting the shield technique or structure optimization in gear cover, cylinder head cover, charge alternator and fuel injection pump.

关 键 词：内燃机 柴油机 噪声源 识别 降噪 

分 类 号：TK421.6[动力工程及工程热物理—动力机械及工程]