Method and apparatus for monitoring and analyzing vibrations in rotary machines
US9874472B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 2010 |
| Grant date | Jan 23, 2018 |
| Priority date | — |
| Expiry date | Nov 15, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/2693
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Vibration amplitudes are recorded as a function of rotation speed and of frequency and the data is analyzed to estimate a noise floor amplitude threshold for each of a plurality of different speed and frequency sub-ranges. On the basis of training data known to be normal speed-frequency areas which contain significant spectral content in normal operation are deemed “known significant spectral content”, so that during monitoring of new data points which correspond to significant vibration energy at speeds and frequencies different from the known significant spectral content can be deemed “novel significant spectral content” and form the basis for an alert. The estimation of the noise floor is based on a probabilistic analysis of the data in each speed-frequency area and from this analysis an extreme value distribution expressing the probability that any given sample is noise is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.