For gearbox condition monitoring, because the difficulty of sensor installation, it is a common practice to measure the vibration at a location far from the fault source. In addition operating the gearbox under different loads and speeds also produces the vibration signals with different components. The vibration measured in this way may be distorted significantly by the effect of signal transmission paths and the interference from other sources. The suppression of distortions is thus a key issue for the remote measurements based condition monitoring. In this paper, the influences of transducer locations and operating conditions on the vibration signal are investigated on a typical gearbox transmission system for the detection of the faults induced to the gearbox. The experimental study results show that the performance of traditional signal processing techniques is not sufficient to reveal fault detection information. However, the new feature from the spectrum of time synchronous average (TSA) signal is very effective in suppressing noise and hence leads to better detection of the local faults induced to the gear system
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