内燃机传动噪声识别的小波分析方法  

The Wavelet Analysis Method of Transmission Noise Source Identification of I.C.Engine

作　　者：杨金才[1] 郝志勇[1] 贾维新[1] 

机构地区：[1]浙江大学,杭州310027

出　　处：《内燃机工程》2005年第5期74-76,共3页Chinese Internal Combustion Engine Engineering

摘　　要：为了降低内燃机噪声必须确定其噪声源。基于内燃机噪声信号非平稳和周期性的特点,用模拟数据说明了将小波分析应用于内燃机噪声信号分析的合理性,并利用连续小波变换对一台车用发动机前、后端的噪声源进行了识别诊断,确定了发动机的噪声源,证明了小波分析是内燃机噪声源识别的一种有效方法。To reduce the sound level of an internal combustion engine, the noise sources must be identified first. The noise of IC engine is a unstable and periodic signal. A numerical example indicated that the method processing the IC engine noise signal with wavelet analysis was reasonable. The CWT （continuous wavelet transform） method was used to identify the noise sources in the front and rear of an engine, and the noises sources were identified correctly. These show that the wavelet analysis is a valid method of noise source identification of IC engine.

关 键 词：内燃机 小波分析 噪声源识别 

分 类 号：TK417.125[动力工程及工程热物理—动力机械及工程]