A dependent complex degrading system with non-periodic inspection times. (July 2019)

• Record Type: Journal Article
• Authors: Castro, Inma T.; Landesa, Luis
• Is Part Of: Computers & industrial engineering. Volume 133(2019)
• Page Start: 241
• Page End: 252
• Publication Date: 2019-07
• Subjects: Condition based maintenance -- Non periodic inspection times -- Gamma process -- Semi-regenerative process; Engineering -- Data processing -- Periodicals; Industrial engineering -- Periodicals; 620.00285
• DOI: 10.1016/j.cie.2019.04.053
• Languages: English
• ISSNs: 0360-8352

Abstract

Highlights: Introduction of a new model to characterize the dependence between degradation processes. Implementation of a condition-based maintenance strategy considering non-periodic inspection times. Analysis of the optimal maintenance policy using semiregenerative techniques. Abstract: This paper analyses a system subject to multiple dependent degradation processes. Degradation processes start at random times following a non homogeneous Poisson process and next dependently propagate. The growth of these degradation processes is modelled using gamma increments. We assume that the arrival of a new process to the system triggers the degradation rate of the processes present in the system. Under this framework, the analytic expression of the system reliability is obtained and bounds of the system reliability are also analyzed. Furthermore, the system is inspected at certain times. Information on the system health is recorded at these inspection times and the decision on performing maintenance actions on the system is taken at these times. We consider in this paper a dynamic inspection policy since the information that becomes available in an inspection time is taken into account to schedule the next inspection time. The maintenance cost for this system is dealt with the use of semi-regenerative process. Numerical examples are performed to illustrate the analytic expressions.