基于分数阶Fourier变换的机械变速过程信号分析

Signal analysis of mechanical modulated velocity processes based on the fractional fourier transform

研究了旋转机械的变速测量过程,通过引入分数阶傅立叶变换(FRFT),推导证明了分数阶傅立叶变换对扫频信号具有良好的时频聚焦性,因此应用分数阶傅立叶变换来分析旋转机械的变速过程的测量信号,可以有效地解决机械转速不恒定对信号分析的影响,提高信号分析、状态监测以及故障诊断的准确性。

The mechanical modulated velocity processes was treated. The Fractional Fourier Transform （FRFr） was applied to find the super properties in time-frequency plane about the chirp signal. So it could eliminate the influence of the uneven rotating velocity on signal analysis. It is useful in signal analysis and system detection and fault diagnosis on mechanical modulated velocity processes.