Abstract
With the development of large rotary machines for faster and more integrated performance, the condition monitoring and fault diagnosis for them are becoming more challenging. Since the time-frequency (TF) pattern of the vibration signal from the rotary machine often contains condition information and fault feature, the methods based on TF analysis have been widely-used to solve these two problems in the industrial community. This article introduces an effective non-stationary signal analysis method based on the general parameterized time–frequency transform (GPTFT). The GPTFT is achieved by inserting a rotation operator and a shift operator in the short-time Fourier transform. This method can produce a high-concentrated TF pattern with a general kernel. A multi-component instantaneous frequency (IF) extraction method is proposed based on it. The estimation for the IF of every component is accomplished by defining a spectrum concentration index (SCI). Moreover, such an IF estimation process is iteratively operated until all the components are extracted. The tests on three simulation examples and a real vibration signal demonstrate the effectiveness and superiority of our method.
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Acknowledgements
The authors gratefully acknowledge the support provided by the National Natural Science Foundation of China (Grant Nos. 11632011, 11472170, 51421092, and 11572189) to this work.
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Zhou, P., Peng, Z., Chen, S. et al. Non-stationary signal analysis based on general parameterized time–frequency transform and its application in the feature extraction of a rotary machine. Front. Mech. Eng. 13, 292–300 (2018). https://doi.org/10.1007/s11465-017-0443-0
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DOI: https://doi.org/10.1007/s11465-017-0443-0