中文摘要：

为了提取空压机噪声信号中的周期成分，采用短时傅立叶变换在Matlab环境下分析了空压机噪声信号，提取了噪声信号中的主要周期分量。分析结果表明：利用短时傅立叶变换可以准确提取空压机噪声信号中的周期分量。时频分析方法是提取噪声信号中周期分量的有效方法。

英文摘要：

In order to extract periodic components from air compressor noise signal,time-frequency analysis of air compressor noise signal has been carried out. In Matlab environment short time Fourier transform was used to analysis air compressor noise signal. Periodic components of air compressor noise signal were extracted. Results show ：periodic components of air compressor noise signal can be extracted by short time Fourier transform exactly. Time-frequency analysis is effective method for extracting periodic components from noise signal.