Journal ArticleDOI
Reliability and maintenance modeling for systems subjected to multiple dependent competing failure precesses
TLDR
In this article, a general reliability model is developed based on degradation and random shock modeling, which is then extended to a specific model for a linear degradation path and normally distributed shock load sizes and damage sizes.Abstract:
For complex systems that experience Multiple Dependent Competing Failure Processes (MDCFP), the dependency among the failure processes presents challenging issues in reliability modeling. This article, develops reliability models and preventive maintenance policies for systems subject to MDCFP. Specifically, two dependent/correlated failure processes are considered: soft failures caused jointly by continuous smooth degradation and additional abrupt degradation damage due to a shock process and catastrophic failures caused by an abrupt and sudden stress from the same shock process. A general reliability model is developed based on degradation and random shock modeling (i.e., extreme and cumulative shock models), which is then extended to a specific model for a linear degradation path and normally distributed shock load sizes and damage sizes. A preventive maintenance policy using periodic inspection is also developed by minimizing the average long-run maintenance cost rate. The developed reliability and ma...read more
Citations
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Journal ArticleDOI
Reliability Analysis for Multi-Component Systems Subject to Multiple Dependent Competing Failure Processes
TL;DR: A new multi-component system reliability model is developed, and an age replacement policy and an inspection-based maintenance policy are applied for a system with multiple components that experience s-dependent competing failure processes.
Journal ArticleDOI
Reliability modeling for dependent competing failure processes with changing degradation rate
TL;DR: In this paper, the authors proposed reliability models for devices subject to dependent competing failure processes of degradation and random shocks with a changing degradation rate according to particular random shock patterns, and considered four different shock patterns that can increase the degradation rate: (i) generalized extreme shock model: when the first shock above a critical value is recorded; (ii) generalized δ-shock model: When the inter-arrival time of two sequential shocks is less than a threshold δ; (iii) generalized m-shock, when m shocks greater than a critical level are recorded; and
Journal ArticleDOI
Reliability and Maintenance Modeling for Dependent Competing Failure Processes With Shifting Failure Thresholds
TL;DR: Reliability models are developed for systems subject to multiple s-dependent competing failure processes with a changing, dependent failure threshold based on degradation and random shock modeling.
Journal ArticleDOI
Some Challenges and Opportunities in Reliability Engineering
TL;DR: In this article, the challenges and opportunities for reliability engineering are discussed in relation to degradation modeling and integration of multistate and physics-based models therein, accelerated degradation testing, component-, system- and fleet-wide prognostics and health management in evolving environments.
Journal ArticleDOI
Condition-based maintenance for continuously monitored degrading systems with multiple failure modes
Xiao Liu,Jingrui Li,Khalifa N. Al-Khalifa,Abdel Magid Hamouda,David W. Coit,Elsayed A. Elsayed +5 more
TL;DR: In this article, an optimum condition-based maintenance (CBM) policy for continuously monitored degrading systems with multiple failure modes is developed, where the degradation of system state is described by a stochastic process, and a maintenance alarm is used to signal when the degradation reaches a threshold level.
References
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Journal ArticleDOI
Using Degradation Measures to Estimate a Time-to-Failure Distribution
C. Joseph Lu,William O. Meeker +1 more
TL;DR: In this article, the authors developed statistical methods for using degradation measures to estimate a time-to-failure distribution for a broad class of degradation models, using a nonlinear mixed-effects model and developing methods based on Monte Carlo simulation to obtain point estimates and confidence intervals for reliability assessment.
Journal ArticleDOI
Survival in Dynamic Environments
TL;DR: This expository paper is an overview of a relatively new class of failure models, both univariate and multivariate, that are suitable for describing the lifelength of items that operate in dynamic environments and may signal a new philosophy of life- testing experiments wherein one also monitors the environmental rules that govern the tests.
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The stress-strength model and its generalizations : theory and applications
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Journal ArticleDOI
Maintenance of Continuously Monitored Degrading Systems
TL;DR: A realistic maintenance policy is investigated, referred to as condition-based availability limit policy, which achieves the maximum availability level of a continuously degrading systems under continuous monitoring.
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