Abstract
The planetary transmission system has been widely used in industry because of its various advantages. And the study on degradation feature extraction method of planetary gearbox is of major significance for mechanical system prognostics and health management (PHM). In this paper, the alpha stable distribution characteristics of planetary gearbox vibration signals in performance degradation process are verified. By observing the change of alpha stable distribution for planetary gearbox degradation experiment data, a new degradation feature extraction method based on alpha stable distribution is proposed, which is called the height of probability distribution (HPD). Through comparative analysis, it is determined that HPD has better linearity and less fluctuation compared with conventional degradation features in planetary gearbox accelerated degradation stage. Moreover, in the accelerated degradation stage, the degradation trend prediction result based on HPD is closer to the actual data than conventional degradation features no matter using Wiener-based or LSSVM-based prediction method. These conclusions indicate that the newly proposed HPD works well and gives accurate estimates for condition monitoring and degradation trend prediction of planetary gearbox.
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Abbreviations
- α :
-
Characteristic parameter of alpha stable distribution
- β :
-
Symmetry parameter of alpha stable distribution
- γ :
-
Scale parameter of alpha stable distribution
- δ :
-
Location parameter of alpha stable distribution
- RMS:
-
Root mean square
- Amp:
-
Vibration amplitude
- f pdf(x):
-
Probability of vibration amplitude x
- HPD:
-
Height of probability distribution
- t r :
-
Prediction time
- Δt :
-
Time span
- Y(t i):
-
Degradation feature value at time ti
- W(t):
-
Cumulative degradation amount at t
- μ :
-
Drift coefficient of Wiener process
- σ :
-
Diffusion coefficient of Wiener process
- B(τ(t, ξ)):
-
Non-linear Brownian motion
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Wenxin Qiao is now a Ph.D. student studying at Army Engineering University, Shijiazhuang, China. Her research interests include system prognostics and health management (PHM).
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Qiao, W., Ni, X., Wang, L. et al. New degradation feature extraction method of planetary gearbox based on alpha stable distribution. J Mech Sci Technol 35, 1–19 (2021). https://doi.org/10.1007/s12206-020-1201-5
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DOI: https://doi.org/10.1007/s12206-020-1201-5