PURPOSE: To continuously monitor the generation of an abnormality, by providing a vibration monitor with a plurality of vibration detectors for individually detecting vibration components of an object being inspected, an adding/subtracting device adapted to feed therein electric signals through amplifiers and subject them to adding/subtracting processes, and a comparator circuit adapted to feed therein the output of an effective value output circuit feeding therein the output of a band-pass filter.
CONSTITUTION: Vibration components of an object being inspected are converted into electric signals by vibration detectors 1W4 and amplified by respective amplifiers 6 and are then fed into a decision unit 7, where the electric signals are subjected to adding/subtracting processes by an adding/subtracting device 8 so as to be a composite signal. Position and negative signs denote adding and subtracting processes respectively, and the positive or negative signs are selected according to the vibration mode being monitored and the sensitivity directions of the detectors 1W4. The effective value of the output waveform from a band-pass filter 9 which draws out only the characteristic frequency component to which attention is paid is compared with a predetermined set value in a comparator circuit 11 to judge the object to be normal or abnormal, and the result is displayed on a display 12.
TANAKA MAMORU
ISHIKAWA SATOSHI
| JPS49109795A | 1974-10-18 | |||
| JPS5621019A | 1981-02-27 |