Abstract
Objective: Aiming at the difficulty of extracting weak faulty vibration features of generator in practical performing, a novel method named self-adapted multi-scale top-hat transformation (SAMST) is proposed to enhance the detection of the characteristic vibration signals.
Methods: Different from other studies, this method employs the Sine-Structure Element (SSE) which is more similar to the signals appear in electrical systems to filter the noise. The most optimal scale of the SSE is obtained by using the method named Feature Amplitude Energy Radio (FAER) to enhance the characteristic faulty components. Experiment studies for an MJF-30-6 type fault simulating generator under the stator inter-turn short circuit fault confirm the advantages of this method.
Results: It is shown that the proposed method can not only enhance all of the three characteristic frequency components of the stator vibration signal respectively at 2f, 4f, and 6f (f is the electrical frequency), but also depress the strong background noises and retain the detailed information at the same time.
Conclusion: This method is probably to offer more convenience for the fault diagnosis of generator and therefore has practical application values.
Keywords: Characteristic vibration signal, enhanced detection, Feature Amplitude Energy Radio (FAER), generator, Self- Adapted Multi-Scale Top-Hat Transformation (SAMST), Sine-Structure Element (SSE).
Graphical Abstract
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