基于表面振动法的柴油机辐射噪声测量和分析.pdf

2 2
2
2
2
2
基于表面振动法的柴油机辐射噪声测量和分析 17
文章编号: 1006 - 1355 (2007) 02 - 0071 - 04
基于表面振动法的柴油机辐射噪声测量和分析
李玉军, 杨建国
(武汉理工大学能源与动力工程学院,武汉 430063)
摘要:以 4120SG柴油机为研究对象,提出基于激光测振的表面振动法测量柴油机辐射噪声。重点讨论了结
构辐射系数的确定及其影响因素,提出了不同结构部件计算辐射系数的方法。利用表面振动法计算了柴油机主要
部件的声功率,识别了主要噪声源。通过与噪声测量结果的对比,验证了方法的准确性。
关键词:振动与波; 柴油机; 辐射噪声
中图分类号: TU112. 23 文献标识码: A
2 2
Rad ia ting No ise M ea surem en t and Ana lysis of D iesel Eng ine Ba sed on
Surface V ibra tion M ea surem en t
L I Yu jun, YAN G J ian guo
( School of Energy and Power Engineering, W uhan University of Technology, W uhan 430063, China)
Abstract: The laser vibrometer based on the surface vibration for measuring and analyzing the radia
ting noise of the 4120SG diesel engine is p roposed. The emphasis is focused on how to decide the radia
ting coefficient and the influencing parameters. The different methods for calculating the radiating coeffi
cient of ponents are p roposed. The sound power levels of the ponents are calculated
by using the surface vibration signals and the main noise sources are identified. The results calculated u
sing the surface vibration signals is verified by the noise measurement results, and the correctness and the
accuracy of the method are confirmed.
Key words: vibration and wave; diesel engine; vibration; radiating noise
有效控制柴油机的噪声主要依赖于确定主要的行表面振动法进行表面噪声测量的不足。
噪声源。当前识别噪声源的方法主要