Journal ArticleDOI
Generalized Cauchy Degradation Model With Long-Range Dependence and Maximum Lyapunov Exponent for Remaining Useful Life
TLDR
In this paper, a new long-range-dependent degradation model is described based on the generalized Cauchy (GC) process, which describes local irregularities and global correlation characteristics of the data time sequence by the Hurst parameter $H$ and fractal dimension $D$.Abstract:
A new long-range-dependent (LRD) degradation model is described based on the generalized Cauchy (GC) process. The GC process is a two-parameter model, which describes local irregularities and global correlation characteristics of the data time sequence by the Hurst parameter $H$ and fractal dimension $D$ . Compared with the fractional Brownian motion (fBm) with linear relationship $H=2-D$ , two parameters of the GC process are independent of each other. The GC process is taken as the diffusion term to describe the LRD characteristics and uncertainty of the degradation process, and the degradation model is established in the form of power law and exponential drift. The Gaussian assumption of the GC process allows us to use linear system theory and statistics to derive its incremental distribution for obtaining the difference iteration form of the GC degradation model. Besides, the dimensionless factors, the principal component analysis (PCA), and the iterative method are used to eliminate the interference of noise on the degradation data. Then, the maximum prediction range of the GC degradation model in the degradation sequence is obtained by the reciprocal of the maximum Lyapunov exponent. Finally, the GC degradation model was applied for prediction of the remaining useful life (RUL) of rolling bearing. The validity of the GC degradation model is verified.read more
Citations
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Product technical life prediction based on multi-modes and fractional Lévy stable motion
TL;DR: A multi-modal Fractional Levy Stable Motion degradation model is developed to predict the product technical life or remaining useful life (RUL) of equipment and its ability to describe multiple stochastic distributions as the tail parameter α changes.
Journal ArticleDOI
An effective defect detection method based on improved Generative Adversarial Networks (iGAN) for machined surfaces
TL;DR: An effective method based on improved Generative Adversarial Networks (iGAN) is proposed to detect defects of machined surfaces on the basis of positive sample training and image restoration to detect surface defects through positive sample learning.
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Hybrid Time-Series Framework for Daily-Based PM 2.5 Forecasting
Pei-Wen Chiang,Shi-Jinn Horng +1 more
TL;DR: Wang et al. as mentioned in this paper proposed a hybrid time-series prediction framework for daily-based PM2.5 forecasting, which consists of three components: the autoencoder, the dilated convolutional neural network, and the gated recurrent unit.
Journal ArticleDOI
An iterative model of the generalized Cauchy process for predicting the remaining useful life of lithium-ion batteries
TL;DR: In this article, an iterative model of the generalized Cauchy process with LRD characteristics is proposed for the remaining useful life (RUL) prediction of lithium-ion batteries.
Journal ArticleDOI
Improvement of stiffness during milling thin-walled workpiece based on mechanical/magnetorheological composite clamping
TL;DR: Based on the previous magnetorheological fluid (MRF) flexible fixture, the authors in this article proposed a composite clamping method to suppress vibration and improve machining accuracy in aerospace thin-walled parts.
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A Hybrid Prognostics Approach for Estimating Remaining Useful Life of Rolling Element Bearings
TL;DR: Experimental results demonstrate the effectiveness of the proposed hybrid prognostics approach in improving the accuracy and convergence of RUL prediction of rolling element bearings.
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