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An Algorithm for Simultaneous Optimization of Parameters of Condition-based Preventive Maintenance

Reliability Engineering Centre, Indian Institute of Technology Kharagpur-721 302, West Bengal, India

V.N. Achutha Naikan

Reliability Engineering Centre, Indian Institute of Technology Kharagpur-721 302, West Bengal, India, naikan{at}hijli.iitkgp.ernet.in

A new condition-based preventive maintenance model for a system, subject to deterioration-failures and to random failures with increasing intensity, is presented. Deterioration is modeled as discrete stages. After an inspection, based on the degree of deterioration, a minimal maintenance or a major maintenance is performed, or no action is taken. Deterioration failures are restored by complete replacements; Random failures are restored by minimal repair. Major maintenance restores the system to `' deterioration stages younger ( > 1), while minimal maintenance restores the system one stage. The proposed model considers an accumulated deterioration based increasing intensity for the random failures. A continuously increasing failure rate (for example Weibull) is converted into a stepwise increasing failure rate using stair-step approximation. An exact recursive algorithm computes the steady-state probabilities of the system. Based on maximization of the system availability or minimization of total cost, an optimal inspection policy within this strategy, optimal inter-inspection time, and threshold deterioration level for replacement, are obtained. The effects of threshold deterioration level for deterioration replacements, inspection, maintenance, and repair parameters are investigated.

Key Words: condition-based preventive maintenance • minimal PM • Major PM • deterioration failure • random failure • minimal repair • stair-step failure rate

Structural Health Monitoring, Vol. 8, No. 1, 83-94 (2009)
DOI: 10.1177/1475921708094793


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