Patent · US Expired

Method and apparatus for diagnosing machine condition

US4530240A · kind A · utility

27Cited by
3References
4Claims
0Family size

Assignee

Inventors

Key dates

Filing dateNov 15, 1983
Grant dateJul 23, 1985
Priority date—
Expiry dateNov 15, 2003

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01N29/12
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

For use in predicting machine failure a transducer sensor, such as piezoelectric crystal, is applied to a machine for sensing machine motion and structure borne sound, including vibration friction, and shock waves. The structure borne sound and motion sensed is converted to electrical signals which are filtered to leave only the friction and shock waves, which waves are processed, as by detecting the envelope and integrating beneath the envelope, resulting in a measure of friction and shock wave energy. This measure may be compared with that of a less used machine, say the same machine when new, to indicate the rise in energy due to change in machine parts.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.