| 摘要 |
A method and apparatus of monitoring the condition or mechanical health of slowly rotating machinery comprises processing signals from sensing means applied to the machinery, which processing approximately or exactly sub-divides the period of a rotational cycle into a number of time or cyclic phase windows, each of which is long compared to the typical duration of a transient excitation of the structure at the frequency or frequencies of detection, applies a threshold level or acceptance criteria or calculates one in such a way that the presence or absence of any significant detectable activity in each of the time or phase windows can be determined for each rotational cycle and the fraction or percentage of those time or phase windows in which activity is present can be measured or averaged so as to provide a statistically significant indication of the extent of the activity throughout the rotational cycle.
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