作者：孟浩东1,3, 高瞩1, 徐毅2, 陈勇将1, 张凤娇1, 罗福强3
作者单位：1. 常州工学院机械与车辆工程学院, 江苏 常州 213002;
2. 常柴股份有限公司, 江苏 常州 213002;
3. 江苏大学汽车与交通工程学院, 江苏 镇江 212013
关键词：柴油机;单缸熄火;声压扫描;噪声源;降噪
摘要：
以某V型双缸柴油机为研究对象，结合单缸熄火法与近场声压扫描法对该柴油机噪声源进行识别试验研究。首先，在不同工况下采用单缸熄火法分离出燃烧噪声和机械噪声，量化内部激励噪声源对整机噪声的贡献度，识别在工况下燃烧噪声和机械噪声的辐射频谱特性；然后，利用近场声压扫描快速定位工况下主要辐射表面的主要辐射部件，识别燃烧噪声和机械噪声的主要传递路径；最后，根据识别结果进行隔声降噪试验验证。该识别方法可为明确柴油机降噪方向与降噪具体目标提供参考。
Experimental study of noise source identification for V-cylinder diesel engine
MENG Haodong1,3, GAO Zhu1, XU Yi2, CHEN Yongjiang1, ZHANG Fengjiao1, LUO Fuqiang3
1. School of Mechanical & Vehicle Engineering, Changzhou Institute of Technology, Changzhou 213002, China;
2. Changchai Co., Ltd., Changzhou 213002, China;
3. School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
Abstract: In this paper,an experimental study of noise source identification for the V-cylinder diesel engine by the method of single cylinder misfire combined with near field scan method was carried out.Firstly,single cylinder misfire method was adopted to separate combustion noise and mechanical noise in different running speeds and loads,the contribution of internal excitation noise source contributing to engine noise was quantified,and the radiation spectrum characteristics of combustion noise and mechanical noise were studied under working conditions.Secondly,main radiating components of main radiating surface were identified quickly by near field scan method under engine working conditions.The major transfer paths of combustion noise and mechanical noise were identified.Lastly,according to recognition results,the noise reduction experiment of sound insulation was carried out.This identification method can provide guidance for defining direction and specific goals of the diesel engine noise reduction.
Keywords: diesel engine;single cylinder misfire;near field scan;noise source;noise reduction
2016, 42(11): 135-139 收稿日期: 2016-3-5;收到修改稿日期: 2016-3-5
基金项目: 江苏省高校自然科学研究面上项目资助（15KJB580001，15KJB460001）江苏省博士后科研资助计划资助项目（1601064C）常州市应用基础研究项目资助（CJ20159011）
作者简介: 孟浩东(1979-),男,江苏无锡市人,讲师,博士后,主要从事车辆NVH测试与控制研究。
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