Nowadays, production systems seek to integrate production and maintenance activities. An effective maintenance plan can improve maintenance stability and system performance. Machines that stop for repairing operation impose a high cost on the system. On the other hand, there are always some intangible situations during a production process in which repairing activities can be carried out. If th...

Inspection is always an important preventive maintenance (PM) activity and can have different depths and cover all or part of plant systems. This paper introduces a two-level inspection policy model for a single component plant system based on a three-stage failure process. Such a failure process divides the system′s life into three stages: good, minor defective and severe defective stages. The...

A set of technical, administrative and management activities are done in the life cycle of equipment, to be located in good condition and have proper and expected functioning. This is refers to be, maintenance management system (MMS). The framework and models of assessment in order to enhance effectiveness of a MMS could be proposed in two categories: qualitative and quantitative. In this resea...

We consider a set of items that must be produced in lots in a capacitated production system. Two types of failures are considered. At the occurrence of Type I failure, the system shifts to an out-of-control state where it produces a fraction of nonconforming items. After a shift, the system is restored to its initial in-control state. With Type II failures, the system stops and it is minimally ...

We deal with the problem of scheduling preventive maintenance (PM) for a system so that, over its operating life, we minimize a performance function which reflects repair and replacement costs as well as the costs of the PM itself. It is assumed that a hazard rate model is known which predicts the frequency of system failure as a function of age. It is also assumed that each PM produces a step ...

We design an optimal preventive maintenance policy for a system of N items that minimizes the total expected maintenance cost. We assume that the budget for preventive maintenance is limited and constrained. The problem has a finite time horizon and we consider constant inter-preventive maintenance times for every item. The resulting nonlinear optimization problem is reformulated as a binary in...

In this paper a stochastic model for a single unit repairable system with Preventive Maintenance (PM) under warranty is analyzed in details by using supplementary variable technique. The cost of repair during warranty is born by the manufacturers, but warranty does not apply to product failure due to user-induced damage such as cracked screen or cracked casing, accident, misuse, physical damage...

In this paper we quantitatively evaluate the security of intrusion tolerant systems with preventive maintenance subject to DoS (Denial of Service) attacks. More specifically, we develop two semi-Markov cost models and describe the stochastic behavior of two intrusion tolerant systems with different preventive maintenance policies. The optimal preventive maintenance schedules are analytically de...

A multi-objective simulated annealing (MOSA) algorithm is described in this chapter to solve a real maintenance workforce scheduling problem (MWSP) aimed at simultaneously minimizing the workforce cost and maximizing the equipment availability. Heavy industry maintenance facilities at aircraft service centres, railroad yards and steel companies must contend with scheduling Preventive Maintenanc...

by the U.S. industry, and it is estimated that approximately 80% of this is spent on correcting chronic failure of machines, system and people.” This clearly indicates the pressing need to reduce these non-product investments, and, in particular, maintenance costs in manufacturing facilities. Another important aspect of non-product investment, especially in the automotive industry, is that moni...