| 摘要 |
PURPOSE:To prevent faults of the rotary machine in advance, by inputting the signal extracted by a sound sensor that is provided at a bearing part into a rubbing detecting circuit and a bearing contact circuit, and detecting the occurrences of the rubbing and the metal contact. CONSTITUTION:When the metal contact of a rotor 20 and the bearing 21 occurs, the generated sound signal is transmitted to the sound sensor 22. When the rubbing occurs between the rotor 20 and a stationary body 23, the generated sound signal is transmitted to the sound sensor 22. The signal from the sensor 22 is inputted to the rubbing detecting circuit 27 and the bearing metal contact detecting circuit 28 through an amplifier circuit 25 and a detecting circuit 26. The circuit 27 feeds the detected signal to a number of rotation timing filter 29. A rotating frequency component is extracted from the control signal from a number of rotation detector 30 and inputted into a rubbing monitor 32 through an averaging circuit 31a. In the circuit 28, the output from the circuit 31a is subtracted from the detected signal, which passes through a bandpass filter 33 and an average value circuit 31b, in a subtracting circuit 34. The result is inputted to a bearing metal monitor 35. Therefore, the faults of the rotor can be prevented in advance. |
