多信息联合技术缸盖罩结构辐射噪声识别研究  

Study of structural radiation noise identification for engine cover based on multi-information joint technology

作　　者：孟浩东[1,2] 白莹[3] 张凤娇[1] 廖旭晖[1] 戴旭东[1] 徐毅 

机构地区：[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]常州信息职业技术学院,江苏常州213000

出　　处：《中国测试》2017年第4期140-144,共5页China Measurement & Test

基　　金：江苏省博士后科研资助计划资助项目(1601064C);江苏省高校自然科学研究面上项目资助(15KJB580001);常州市应用基础研究项目(CJ20159011)

摘　　要：以某四缸柴油机缸盖罩薄壁件为研究对象,给出一种多信息联合识别技术,融合近场声压阵面扫描法、基于平板理想化的表面振速法及隔声法的识别优势对其结构辐射噪声进行分离与识别研究。针对整机噪声声功率级超标问题,利用近场声压阵面扫描快速定位标定工况下柴油机缸盖罩辐射噪声源;基于平板结构的辐射模型分析缸盖罩的声辐射能力;在综合考虑声辐射系数影响因素基础上,识别分析缸盖罩结构噪声的辐射特性,与传统方法相比可提高识别精度;再结合隔声法深入地识别缸盖罩结构噪声中的主要噪声源;最后,对识别结果进行降噪试验验证。该识别技术可为明确柴油机薄壁件降噪目标及其结构低噪声设计目标提供理论指导。In this paper, the thin-walled component of engine cover for a four cylinder diesel engine was taken as the research object, a multi-information joint identification technology was proposed, identification benefits of near field scan method, surface vibration measurement method based on plate idealization identification of structural and sound insulation method were integrated, with which separation and radiation noise for the engine cover was studied. According to the problem of making engine sound power level higher than the national standard, Firstly, the noise source of engine cover was identified quickly by near field scan method under engine calibration conditions; the radiation capability of engine cover was studied based on plate radiation model; Secondly, on the basis of considering influence factor of the sound radiation coefficient, radiation characteristics of structure surface noise for engine cover were analyzed, compared with the traditional method, identification accuracy was improved; the main noise source from structure noise of engine cover was further identified with sound insulation method; Lastly, recognition results were verified through noise reduction test. This identification technology can provide guidance for specific goals and structural low-noise design of thin-walled components of diesel engine.

关 键 词：缸盖罩 振速 隔声 辐射特性 降噪 

分 类 号：TB535[理学—物理]