车用发动机前端辐射声源的小波分析与识别

Analysis and Identification of Front-end Noise Source of a Diesel Engine Based on Wavelet Transform

根据连续小波变换具有较二进离散小波变换和小波包变换更精细的尺度分辨率的特点 ,研究了适用于工程应用的发动机表面辐射声信号小波变换结果的表述方法 ,并以一台车用增压柴油机前端表面辐射噪声的测量和识别分析为例 ,提出了一种车用发动机主要噪声源诊断和识别的测试分析方法。文中还将声信号测量识别的结果与表面振动信号识别的结果做了比较 ,两者是吻合的。

Based on the analysis of acoustic signals using wavelet transform technique,an investigation into the noise source identification for a diesel engine is presented,taking the surface radiated noise identification for the front-end of a vehicular supercharged diesel engine as example.A testing/analysis method for the diagnosis and identification of main noise sources in vehicle engine is proposed.The results are well agreed with those using surface vibration signal identification technique.