Harmonic Vibration Monitoring of Rotating Machinery Using General Corrected FFT Spectrum
Harmonic Vibration Monitoring of Rotating Machinery Using General Corrected FFT Spectrum
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发表时间：
2004
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通讯作者：
G. Wan-lin
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作者：
G. Wan-lin
傅里叶谱是诊断旋转机械故障的有力工具之一。然而，尽管使用了各种窗函数，FFT 频谱中仍会出现泄漏效应。另外，FFT频谱是按指定频率间隔采样连续频谱的结果，谐波对应的谱线并不位于主瓣中心。因此，计算出的振动分量的频率、幅度和相位是不准确的。提出了一种基于黄金分割的通用校正谱。各类仿真信号表明，与其他技术相比，该方法具有精度更高、计算复杂度更低、适应性更广的优点。此外，该新方法证明试验台的分析结果可以获得准确的启动阶段临界转速、加速度曲线和幅频响应，为表征旋转机械的瞬态行为提供了有效的工具。
Fourier spectrum is one of powerful tools to diagnose the faults of rotating machinery. However, leakage effects appear in the FFT spectrum despite the use of all kinds of window functions. In addition, an FFT spectrum is the result of continuous spectrum sampled with specified frequency interval and the corresponding spectrum line of harmonic is not located in the center of the main-lobe. Consequently, the calculated frequency, amplitude and phase of the vibration component are not accurate. A general corrected spectrum based on golden section is proposed. All types of simulation signals show that the method possesses the merit of higher precision, lower calculation complexity and broader adaptability in comparison with other techniques. Furthermore, the analytical results of test rig proved by this novel approach can obtain the accurate critical speed, acceleration curve and amplitude-frequency response in start-up stage and provide an effective tool to character the transient behavior of rotating machinery.