Software systems experience gradual performance degradation despite of which they are required to perform service, though at a degraded level. Different preventive and corrective techniques (restart, rejuvenation etc.) have been applied to restore efficient service of the system. In this paper, we model the process of degradation together with the corrective actions of minimal repair, major rep...

Optimal preventive maintenance and repairmen policies for a system of machines subject to degradation with age and intermittent breakdowns and repairs are derived using optimal control theory. When this system of machines forms part of a dynamic process control system, a method of obtaining optimal closed-loop control law is indicated. I . INTRODUC~ON Many large industrial systems have two dist...

In this paper, a single-product, single-machine system under Markovian deterioration of machine condition and demand uncertainty is studied.  The objective is to find the optimal intervals for inspection and preventive maintenance activities in a condition-based maintenance planning with discrete monitoring framework. At first, a stochastic dynamic programming model whose state variable is the ...

A common situation arising in flow shops is that the job processing order must be same on each machine; this referred to as a permutation shop scheduling problem (PFSSP). Although many algorithms have been designed solve PFSSPs, machine availability typically ignored. Healthy conditions are essential for production process, which can ensure productivity and quality; thus, deteriorating effects ...

The paper deals with possibilities of maintenance optimisation of k-out-of-n systems. The first part of the paper briefly analyses influence of preventive maintenance concept on reliability of k-out-of-n system and presents possibilities of preventive maintenance optimisation with respect to maintenance costs. The second part of the paper presents a suggested method of maintenance optimisation ...

To get the most out of its preventive maintenance (PM) activities, Technical Services Partnership (TSP) at the University of Vermont first needed to determine the failure rate for various types of healthcare technology. This massive undertaking, deemed the Comprehensive Preventive Maintenance Frequency Adjustment Project, would provide TSP with the data it needed to optimize equipment maintenan...

Industrial equipment is usually repairable. Reliability of repairable systems depends on maintenance actions, and is characterized by mean cumulative function or failure intensity function of failure processes. Evolution trend of the failure intensity function is called the system-level failure pattern in the literature. The failure pattern plays an important role in preventive maintenance deci...