Abstract
Though accelerometers for condition diagnosis of a bearing is preferably placed at the nearest position of the bearing as possible, in some plant equipment, the accelerometer is difficult to set near the diagnosed bearing, and in many cases, sensors have to be placed at a location far from the diagnosed bearing to measure signals for diagnosing bearing faults. Since, in these cases, the measured signals contain stronger noise than the signal measured near the diagnosed bearing, bearing faults are more difficultly to be detected. In order to overcome the above difficulty, this paper proposes a new fault auto-detection method by which the signals measured by an accelerometer located at a far point from the diagnosed bearing can be used to simply and accurately detect the bearing faults automatically. Firstly, the hybrid GA (the combination of genetic algorithm and tabu search) is used to automatically search and determine the optimum cutoff frequency of the high-pass filter to extract the fault signal of the abnormal bearing. Secondly, the bearing faults are precisely diagnosed by possibility theory and fuzzy inference. Finally, in order to demonstrate the effectiveness of these proposed methods, these methods were applied to bearing diagnostics using vibration signals measured at the far point of the diagnostic bearing, and the efficiency of these methods was verified by the results of automatic bearing fault diagnosis.
Highlights
The bearing is the most important component to support the rotating mechanical shafting [1].Bearing failures can be classified into initial failures, medium-term failures, and final failures [2,3]
To solve the problems described above, novel methods by which bearing faults can be automatically, and precisely diagnosed using the signals measured by the acceleration sensors at distant points from the diagnosed bearings was proposed as follows: (1) In order to extract the characteristic signal of a fault bearing from the signal measured far from the bearing as sensitively as possible, a method by which the optimal cutoff frequency of HPF is automatically searched and decided by hybrid genetic algorithm (GA) is proposed
In order to effectively extract a vibration signal signal from an abnormal bearing, the cutoff frequency of a high-pass-filter is automatically optimized from an abnormal bearing, the cutoff frequency of a high-pass-filter is automatically optimized by by hybrid GA
Summary
The bearing is the most important component to support the rotating mechanical shafting [1]. To solve the problems described above, novel methods by which bearing faults can be automatically, and precisely diagnosed using the signals measured by the acceleration sensors at distant points from the diagnosed bearings was proposed as follows:. (1) In order to extract the characteristic signal of a fault bearing from the signal measured far from the bearing as sensitively as possible, a method by which the optimal cutoff frequency of HPF is automatically searched and decided by hybrid GA (the combination of genetic algorithm and tabu search, GA+TS) is proposed. At distant points from the diagnosed rolling bearings, and the efficiency of these methods (4) these methods were applied to bearing diagnosis using the vibration signalshave been verified byatthe results of the automatic bearing faults diagnosis. Measured distant points from the diagnosed rolling bearings, and the efficiency of these methods have been verified by the results of the automatic bearing faults diagnosis
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