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Due to the competition at the regulated energy market, transmission system operators want to save expenditures. Maintaining and replacing assets cause a part of expenditures at a transmission system. By including reliability calculation at the determination of maintenance and replacement strategies, expenditures can be saved without decreasing the availability of the grid. In this contribution, ant...
As the competitive environment at the energy market has changed, transmission system operators are forced to save expenditures. An optimization of maintenance and replacement strategy can be performed in order to adapt the budget for maintenance and replacement while the availability of the grid is kept at least constant. This contribution uses ant colony optimization to prioritize assets for maintenance...
This article studies a two-unit system with failure interactions. The system is subject to two types of shocks (I and II). A type I shock, removed by a minimal repair, causes a minor failure of unit A and type II shock causes a complete system failure that calls for a corrective replacement. Each unit A minor failure also results in a random amount of damage to unit B and such a damage to unit B can...
Assets in transmission systems are maintained according to the time-based strategy. But assets importance for the availability of the grid is neglected which means the allocation of maintenance expenditures may be inefficient. This paper introduces an optimization model which is able to improve the reliability of a transmission system as well as expenditures for maintenance and replacement. It is...
An inventory decision model of multi-item maintenance materials is analyzed for a joint ordering problem. A unanimous ordering policy which reviews inventory continuously of multi-item is applied in the model. The aim of inventory control of maintenance materials is ensuring the service level and reducing the inventory cost. According to this objective, an algorithm is proposed. Firstly, supposed...
With the increasing concerns on global warming, low-carbon economy and sustainable development have emerged as an important aspect that affects the business decisions. In this research, we study the effect of carbon emission in the capacity planning problem. This problem is important since equipment has the so-called "lock-in effect", that is, once it is installed, it is difficult to change...
In imperfect production processes, this paper considers production correction and maintenance to break away out of control state. Production processes are classified into two types of state: one is the type I state (out-of-control state) and the other is the type II state (in-control state). The type I state involves adjustment of the production mechanism. Production correction is either imperfect;...
According to the characteristics and the real situation of military equipment maintenance support, the paper analyzes the basic manner and contradiction of forming quality culture of equipment 6σ maintenance. And defines three major factors of forming quality culture as the attention and participation of commander, carrying out managing law, and building and improving the mechanism of rewards and...
Equipment Battlefield damage repair (BDR) sequence is an important content in the equipment maintenance support decision-making in wartime. If not handled correctly, time, man-hours, parts, and resources will be wasted and opportunities to get back in the fight will be missed. The influence factors of equipment BDR sequence were analyzed considering the requirements of equipment maintenance support...
This document focused on the contradiction of ship maintenance plans, maintenance resources and maintenance requirements, proposed to solve this kind of questions by using Constrained Satisfaction Problem (CSP) solving techniques, built the Task Oriented Ship Maintenance Operation Arranging Model, in which, economic costs and time costs were considered simultaneously. At last, several kinds of artificial...
The following topics are dealt with: advanced decision analysis; e-business process; knowledge management; engineering economy; cost analysis; global collaboration; global information system integration; information management; product lifecycle management; manufacturing systems; operations research; production planning; production control; quality control; quality management; reliability engineering;...
Assigning dorm rooms to 2500 students with complex and interdependent preferences is a difficult optimization problem. In this paper, we present an optimization method which is based on an improved variant of simulated annealing for the whole dorm room assignment problem. We also compare empirically the performance of three different improved variants of simulated annealing in solving this problem:...
Based on the characteristics of the equipment support and the current war factual situation, the rush-repair task of damage equipment was classified according to different urgent level. Then the rush-repair task assignment model was made based on the urgent level of the damaged equipment, and the method is given to solve the model. Finally, the example validates the model and the result indicates...
We introduce a failure and repair model that is a discrete-time version of the pure birth shock model. Its discrete lifetime is a random sum with support on N, and with geometric summands, that represent the number of successful tasks between consecutive shocks performed by an engineering system. We provide distributional properties and conditions that lead to the discrete aging properties of such...
Generalized stochastic Petri net model is proposed for support system with a classic structure of three-echelon repair and two-echelon inventory. Based on Petri net workflow models of various maintain processes, extendable queue models with generalized queuing time concept are presented to analyze performance equivalent time. A strategy of spare parts inventory minimizes the number of backorder for...
Several periodic preventive maintenance (PM) models have been developed in the literature. This paper introduces an adaptive failure law which can vary over time depending on the missions to achieve. From this degradation law, the purpose of this paper is to develop a preventive maintenance policy for finite horizon of time, noted H, based on a set of improvement maintenance actions at fixed interval...
The following topics are discussed: industrial engineering and engineering management; technology and knowledge management; operations research; quality control and management; engineering economy and cost analysis; production planning and control; decision analysis and methods; reliability and maintenance engineering; service innovation and management; project management; supply chain management;...
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