Random of Non-Periodic Impacts
A loose machine component that hits something at a rate that is unrelated to machine speed will generate impacts that are usually not precisely periodic, and can be essentially random in their spacing. In the vibration spectrum of such a condition, the impacts will produce a continuous noise spectrum that can extend to very high frequencies. The spectrum could be confusing in that other sources or wide band noise will look almost the same. In the waveform, the impacts are clearly seen.
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