内燃机活塞拍击表面振动与燃烧噪声的关系

Study on the Relation Between Piston Impinging Vibration and Combustion Noise of Internal Combustion Engines

通过测量噪声和表面振动信号,用时间窗获取的噪声信号主要为活塞拍击噪声和燃烧噪声,并对表面振动信号进行频谱分析和时频分析,确定该噪声信号中活塞拍击噪声可能出现的频率范围和对整个噪声分析频率带能量的贡献,不加区别地把燃烧噪声和活塞拍击噪声看作是燃烧噪声进行燃烧噪声机理研究的方法是不可取的。

In this paper,the noise and the surface vibration were measured.The noise gained by time window were the piston impinging noise and combustion noise.The spectrum analysis and time-frequency analysis were used to precess the surface vibration signal.The producing frequency range of piston impinging noise and the contribution of the energy to the whole noise frequency range were determined.It is suggested that to regarded the combustion noise as the noise from combustion and piston impingement was improper.