| 摘要 |
<p>One or more electrostatic sensors (13,14,15) and a tacho generator (2) are provided in a rotating machine (1) such as a gearbox. Signals from the sensors (13,14,15) and the tacho generator (2) are processed by a signal processing circuit to monitor for abnormal interaction between plural interacting components of the machine (1). The signal from the tacho generator (2) may be used by the signal processing circuit to produce a signal (27) which is an average of the electrostatic activity at the interacting components over a cycle of the machine. Such an averaged signal will contain enhanced components relating to electrostatic activity relating to the cycle of the machine. <IMAGE></p> |
