检索结果-南通市图书馆

Network-level optimization method for road network maintenance programming based on network efficiency

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2015年第12期22卷 4882-4889页

作者：张林雪秦进贺钰昕叶勇倪玲霖 School of Traffic and Transportation Engineering Central South University Dongfang College Zhejiang University of Finance & Economics

To maintain their capacity,transportation infrastructures are in need of regular maintenance and *** major challenge facing transportation engineers is the network-level policies to maintain the deteriorating roads at an acceptable level of *** this work,a quantitative transportation network efficiency measure is presented and then how to determine optimally network-level road maintenance policy depending on the road importance to the network performance has been *** examples show that the different roads should be set different maintenance time points in terms of the retention capacities of the roads,because the different roads play different roles in network and have different important degrees to the network *** network-level road maintenance optimization method could not only save lots of infrastructure investments,but also ensure the service level of the existing transportation system.

关键词： transportation network maintenance policy network efficiency time point sensitivity analysis

Optimal maintenance decisions for gamma deteriorating systems

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2011年第5期22卷 788-793页

作者： Lin Tan Chiming Guo Zhijun Cheng Bo Guo Department of Human Sciences College of Humanities and Social Sciences National University of Defense Technology Changsha 410074 P. R. China Department of Systems Engineering College of Information System and Management National University of Defense Technology Changsha 410073 P. R. China

An optimal replacement model for gamma deteriorating systems is studied. This methodology uses a gamma distribution to model the material degradation, and the impact of imperfect maintenance actions on the system reliability is investigated. The state of a degrading system immediately after the imperfect maintenance action is assumed as a random variable and the maintenance time follows a geometric process. A maintenance policy （N） is applied by which the system will be repaired whenever it experiences Nth preventive maintenance （PM）, and an optimal policy （N＊） could be determined numerically or analytically for minimizing the long-run average cost per unit time. Finally, a numerical example is presented to demonstrate the use of this policy.

关键词： maintenance policy gamma process geometrical process deteriorating system imperfect maintenance.

Optimal Replacement policy for Cold Standby System

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2011年第2期24卷 316-322页

作者： TAN Lin YANG Jian CHENG Zhijun GUO Bo College of Humanities and Social Sciences National University of Defense Technology Changsha 410073 China Guilin Airforce Academy Guilin 541003 China College of Information System andManagement National University of Defense Technology Changsha 410073 China

Investigators are attracted by the complexity and significance of preventive maintenance problem,and there are hundreds of maintenance models and methods to solve the maintenance problems of companies and army,going with a lot of investigative harvests. However,one-component system or series system is focused by most of the *** problem of preventive maintenance（PM） on cold standby repairable system does not attach importance despite the fact that the cold standby repairable system is ubiquitous in engineering *** this paper,an optimal replacement model for gamma deteriorating system is *** methodology presented uses a gamma distribution to model the material degradation,and the impact of imperfect maintenance actions on system reliability is *** an imperfect maintenance action,the state of a degrading system is assumed as a random variable and the maintenance time follows a geometric process.A maintenance policy（N）is applied by which the system will be repaired whenever it experiences the Nth PM,and an optimal policy（N~＊） could be determined numerically or analytically for minimizing the long-run average cost per unit time.A numerical example about how to confirm the optimal maintenance time by the inspecting information of liquid coupling device is given to demonstrate the use of this *** paper presents a condition-based replacement policy for cold standby repairable system under continuous *** contribution embody in two aspects,relaxing the restrictions of hypothesis and investigating the condition-based maintenance policy of the cold standby repairable system which is ignored by others.

关键词： cold standby system maintenance policy gamma process geometrical process imperfect maintenance

Availability modelling for periodically inspected systems under mixed maintenance policies

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2021年第3期32卷 722-730页

作者： LI Junliang CHEN Yueliang ZHANG Yong ZHANG Zhuzhu FAN Weijie Qingdao Campus Naval Aeronautics UniversityQingdao 266041China

The availability of a periodic inspection system under mixed maintenance policies is studied in this *** accommodate the characteristic of multiple failure modes for complex systems,the system failures can be divided into two failure modes:hard failure and soft *** hard failure occurs,the corresponding corrective maintenance will be performed,taking a random time under the perfect maintenance policy;in contrast,if the soft failure is found,the corresponding preventive maintenance will be performed,taking a random time under the imperfect maintenance *** dynamic age setback model is adopted for imperfect maintenance,which can accurately reflect the fault characteristics of the degraded *** an analytical model for system steady state availability and instantaneous availability are ***,the optimal method to maximize the system steady-state availability through adjusting the inspection interval is *** to the above research,the optimization of system unit time cost,preventive maintenance intervals and availability is ***,the developed approach is demonstrated by a numerical example.

关键词： availability reliability maintenance repairable system maintenance policy

maintenance and Condition-Based maintenance

在线全文

学校读者我要写书评

暂无评论

International Journal of Plant Engineering and Management 2005年第3期10卷 160-170页

作者： DING Jin-hua WANG Xue-Jun ZHOU Rong LIN Min Olsson Erland Department of Mechanical Engineering Dalian Institute of Light Industry Dalian 116034 P. R. China Department of Information Design and Product Development Maeilardalens University Box 325 Eskilstuna 63105 Sweden

The evolution of maintenance management is briefly introduced in this paper, from corrective maintenance to preventive maintenance. First, a range of condition monitoring and fault diagnosis techniques developed in different industries are surveyed; Second, many methods of condition monitoring are presented; Third, mathematical methods used in condition monitoring are given; Then the merits and shortcomings are discussed. Efficient maintenance policies are of fundamental importance in system engineering because of their fallbacks into the safety and economics of plant operation. Applying condition-based maintenance to a system can reduce the cost and extend the availability of facilities. With the advent of personal computers as fast and cost effective machines for data acquisition and processing of multiple signals some shortcomings mentioned in condition monitoring could be solved or reduced to some extent. These PCs can be a solution as a condition monitoring based maintenance system.

关键词： maintenance policy reliability condition-based monitoring

A Markov Model for Production and maintenance Decision

在线全文

学校读者我要写书评

暂无评论

Macro Management & Public Policies 2020年第1期2卷 1-5页

作者： Mohammad Saber Fallahnezhad Alie Ranjbar Faeze Zahmatkesh Sredorahi Industrial Engineering Yazd UniversityYazdIran

In this paper,we consider a production machine which may fail and it is necessary to repair the machine after each failure and there are two statuses for each repair;in one case,we should replace the machine because of catastrophic failure and in the other case,only small repairs are *** between failures and repair and replace times are random and demands are satisfied by inventory during repairing and replacing the machine;shortage level is *** model described system as a Markov chain and develop an algorithm to compute the expected number of transitions among states.

关键词： Markov chain Cost function maintenance policy Production process