| 摘要 |
PURPOSE:To detect the abnormality of rotary equipment with high accuracy by reading an optimum pattern among plural stored limit-value patterns according to a loading state and also applying a proper bias to the read pattern. CONSTITUTION:A signal from a vibration detector 1 is amplified 2 and an FFT(fast Fourier transform processor) 4a analyzes its frequency and then transfers the signal to a comparator 6. A signal from a detector 3 for the number of rotation and a signal from a loading quantity detector 8 are stored as data on the number of rotation and a loading quantity in a signal buffer part 10 by the FFT4a and a signal processing circuit 9 respectively, and inputted to a control part 7 successively. A limit-value pattern memory 5a is stored with plural limit-value patterns corresponding to various operation states wherein combinations of the rotating speed and loading quantity of the rotary equipment are different and a bias circuit 11 performs arithmetic processing under the command of the control part 7 to adjust a limit-value level. Then, the comparator 6 compares the output of the circuit 11 wit the output of the FET4a to detect the abnormality.
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