PURPOSE: To perform rapid and reliable detection of abnormality by a method wherein one of a plurality of decision characteristic curves is selected according to a running state, and by comparing a decision value selected based on the curve according to an effective power with an actual shaft vibration value, an abnormal running state is decided.
CONSTITUTION: A hydraulic machine is provided with a sensor 10 to individually measure water pulsation vibration, a shaft swing, and vibration, a shaft vibration value during actual running is calculated from an output signal a1 therefrom by a computing circuit 11, and a calculating result is inputted to a comparator 12. A recording device 16 to record a head signal a2 for water during running and an effective power signal a3 is provided, and the two signals a2 and a3 are inputted to a decision value calculating circuit 17. In which case, from a point of intersection between a characteristic curve, selected according to a running state from a plurality of decision value characteristic curves changed according to a change in a shaft vibration value responding to an effective power and responding to a difference in n water head, and a current effective power, a decision value is selected. When an actual shaft vibration value exceeds the decision value, it is decided by the comparator 12 that a hydraulic machine is in an abnormal running state.
HONMA HIROSHI
WATANABE SHUNZO
NAKAMURA FUMIO
NOGUCHI TETSUYA
TOSHIBA CORP
| JPS62162775A | 1987-07-18 |