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Multivariate degradation modeling using generalized cauchy process and application in life prediction of dye-sensitized solar cells

Journal Article · · Reliability Engineering and System Safety
 [1];  [1];  [2];  [1];  [3]
  1. Wichita State University, KS (United States)
  2. Michigan Technological University, Houghton, MI (United States)
  3. Portland State University, OR (United States)

Recently, the Generalized Cauchy (GC) process has been applied to capture a Long Memory (LM) phenomenon in product degradation modeling and life prediction. Compared with the traditional fractional Brownian motion that captures the LM using a single Hurst parameter, the GC process has two free parameters (Hurst and fractal dimension parameters) that flexibly capture both global LM and local irregularity. However, all existing GC-based degradation models are for a single Degradation Characteristic (DC). In this article, motivated by a real degradation problem of dye-sensitized solar cells that jointly exhibits multiple DCs, global LM, local irregularity and DC-wise cross-correlation, we propose a novel GC-based Multivariate Degradation Model (GC-MDM) to simultaneously capture the aforementioned effects. A maximum likelihood estimation approach is developed to estimate parameters of the GC-MDM. Subsequently, product life prediction based on the GC-MDM is developed. The proposed GC-MDM is validated through a simulation study and a physical experiment of dye-sensitized solar cells. Furthermore, results show that the proposed GC-MDM fundamentally improves the life prediction accuracy in comparison with conventional degradation models which significantly misestimate the uncertainty of product life.

Research Organization:
Wichita State University, KS (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; National Science Foundation (NSF); National Aeronautics and Space Administration (NASA); USDOE
Grant/Contract Number:
EE0009525; OIA-2148878; 80NSSC22M0028
OSTI ID:
2506141
Alternate ID(s):
OSTI ID: 2479005
Journal Information:
Reliability Engineering and System Safety, Vol. 255; ISSN 0951-8320
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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