Truncation or flattening of the signal
In many cases of looseness, such as a bearing pillow block that rises up a little during part of the rotation and then contacts the base for the rest of the cycle, the waveform will be flattened on one side. This will result in harmonics in the spectrum, but other types of waveform distortion will also produce harmonics. The waveform gives a quick identification of this kind of looseness where motion is restricted in one direction.
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