Apparatus for estimating the strain on an inaccessible portion of a rotating shaft
US4282756A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1979 |
| Grant date | Aug 11, 1981 |
| Priority date | — |
| Expiry date | Jul 10, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H1/003
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This invention concerns apparatus for reliably estimating the strain on an inaccessible portion of a shaft of a turbine generator system which is susceptible to torsional oscillation. The strain is continuously predicted on a real time basis as a function of the modal analysis parameters of the shaft. Furthermore, system torque is detected electrically at the output of the generator. This signal along with signals representative of shaft angular velocity at the easily accessible ends thereof is provided to the modal analysis means as inputs. The provision of these latter system data allow for the elimination of an equal number of unknowns in the modal analysis representation, thus reducing the complexity of the analyzing system and increasing the reliability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.