时频分析在发动机振动监测与故障诊断中的应用

The Joint Time-Frequency Analysis Applications for Aeroengine Vibration Monitor and Fault Diagnosis

中文关键词:  振动监测  时域滑窗  短时傅里叶  特征信息

英文关键词:vibration monitor  sliding window in time domain  STFT  eigenfrequency

中文摘要:

      针对航空发动机的振动监测和故障诊断，介绍了一种基于时域滑窗的短时傅里叶变换的时频分析方法。采用标准信号和发动机实测振动数据对该方法进行了验证，验证结果证明了该方法的正确性和优越性，表明了该方法可以准确有效地对发动机振动特征信息进行提取，用以进行发动机振动监测和诊断。

英文摘要:

      The joint time-frequency analysis(JTFA) method based on short time Fourier transform(STFT) of sliding window in time domain is presented for aeroengine vibration monitor and fault diagnosis.The method is verified by using standard signal and the data gathered from flight test，and the result of the process proves the correctness and advantage of the method and indicates that this method can be effectively utilized to pick out the eigenfrequency of the engine vibration signal accurately,which will be used in monitoring and diagnosing aeroengine vibration．