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首页> 外文期刊>Mechanical systems and signal processing >Phase spectrogram and frequency spectrogram as new diagnostic tools
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Phase spectrogram and frequency spectrogram as new diagnostic tools

机译：相位频谱图和频率频谱图作为新的诊断工具

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The power spectrogram has found wide use in diagnostics based on mechanical vibrations. It makes use of the amplitude values of the Short Time Fourier Transform (STFT) but does not consider the information contained in the phase values. In the phase spectrogram, on the other hand, it is precisely the phase values of the STFT that are processed so that they can be presented graphically and are useful. The time-frequency distribution of the phase of a specific component supplies information about the phase modulations around a reference point, which determines both the reference phase and the reference frequency for this component. The frequency spectrogram is calculated from the phase difference between each time slice of the STFT. The frequency spectrogram shows the drift on the instantaneous frequency of each spectral component. These tools have proven to be useful complements to the power spectrogram. In crack detection, for example, they accentuate any frequency drift that occurs in the damped free-decay response of a cantilever beam, which appears to be a function of the crack depth. When identifying a sporadically pulsed vibration source, the ability to show the phase coherence from one impact to the other in time on the spectrogram makes it possible to draw a conclusion about the presence of a stable-vibration source hidden in the background. A dual-channel phase spectrogram is also presented with two application examples.
机译：功率谱图已广泛用于基于机械振动的诊断中。它利用了短时傅立叶变换（STFT）的幅度值，但没有考虑相位值中包含的信息。另一方面，在相位频谱图中，正是STFT的相位值被处理，以便可以图形方式显示它们并且非常有用。特定组件相位的时频分布提供有关参考点周围相位调制的信息，该信息确定该组件的参考相位和参考频率。根据STFT每个时间片之间的相位差计算频谱图。频谱图显示了每个频谱分量瞬时频率的漂移。这些工具已被证明是对功率谱图的有用补充。例如，在裂缝检测中，它们会加剧悬臂梁的阻尼自由衰减响应中出现的任何频率漂移，这似乎是裂缝深度的函数。在识别偶发脉冲振动源时，能够在频谱图上及时显示从一个冲击到另一个冲击的相位相干性的能力，可以得出关于隐藏在背景中的稳定振动源的结论。还给出了两个应用示例，给出了双通道相位谱图。

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