基于小波分析的压气机失速故障检测

当发动机发生失速时，会引起压气机内压力信号的变化，这种压力信号的变化可以看作信号的奇异点，利用小波分析所具有的时－频特性和多分辨分析的特点，结合对压气机内压力信号频率成分的研究，通过检测模极大值的方法来确定信号的奇异点，进而探测压气机的失速故障，结果表明，利用该方法可以准确地检测压气机失速故障。

Detection of compressor stall based on wavelet analysis

Stall in engine compressor will result in variation of pressure in its compressors, which is regarded as a singularity of signal. Considering the good performance of wavelet analysis in time and frequency domain, a method based on multi scale wavelet transform was proposed to detect the compressor stall, which is based on the fact the wavelet transform of a signal will take its modulus maximum at its singular point in transform domain. As a result, the engine stall is detected precisely through the method developed in this paper.