基于粒子群算法的半导体制造设备预维修调度

对半导体制造设备的预维修调度问题进行了研究,建立了半导体制造设备预维修调度的数学模型,分别提出了用于求解该问题的启发式方法和粒子群算法方案,阐明了两种算法方案的具体实现过程。通过对仿真实例进行计算和结果比较,表明了粒子群算法优于启发式方法,取得了不错的优化效果。     

Gamma Approximation for Preventive Maintenance Scheduling

This paper presents an approximation model for determining minimum cost preventive maintenance schedules where accurate failure data are not available except the “average” (mean) and the “typical” value (mode) of the component lifetime.     

设备维护外包策略及其对维护计划组织的影响

根据设备维护流程分析,提出了设备维护外包的三种外包策略--购进型外包、选择型外包和完全型外包.从组织结构、计划制定和资源协调三方面分析了设备维护外包的不同策略对设备维护计划组织的影响.     

汽车维修服务站瓶颈工序的实时调度

在结合优化调度理论和约束理论的基础上,从最小化目标、机器环境、加工特征和约束几方面分析了汽车维修服务站瓶颈工序的实时调度问题的特征,建立了对应的数学模型。根据问题特性,设计了包含复合动态分派规则的启发式调度算法。以实例分析验证了算法的可行性,仿真结果展示了所用算法在优化目标函数值上的优越性和计算时间的可行性。     

Determination of Coordinated Maintenance Scheduling Frequencies for a Group of Machines

An economic model of maintenance planning for a machine shop is developed. Maintenance can be performed on an individual machine or the entire group of machines simultaneously. The coordinated maintenance on the group would save on the fixed costs associated with separate overhauls. The frequencies of maintenance on each machine within two consecutive coordinated overhauls and the time between these coordinated overhauls is determined. The resulting model selects a solution that is close to the minimum of the total cost of production and maintenance.     

装甲装备器材保养包装平台的构建

装甲装备器材保养包装是器材储备供应体系的重要环节,是保证器材质量完好、提高器材保障能力的重要技术措施。以保养包装新模式为理论指导,研制了自动化保养设备及系列保养包装材料,制定了保养包装规范,开发了质量管理信息系统,在此基础上,设计并建设了装甲装备器材保养包装平台,全面提升了装甲装备器材保养包装质量与效能。     

Analysis of the Improvement Methods for Equipment Maintenance Support

According to military requirement, and based on the problems of equipment maintenance support methods in high-tech battles, each element supporting equipment maintenance is analyzed, and the methods for improving equipment maintenance are proposed.     

Maintenance Scheduling with Delay-time Modelling: An Overview

Effective maintenance is a key for infrastructures′ high operational reliability. The integration of corrective repairs and schedule-based failure preventions has been a mainstream of modern maintenance, and an associated policy-making technique, delay-time modelling, is overviewedin this paper for optimising the maintenance cost-efficiency in different practical scenarios, including imperfect, opportunistic and nested maintenance. A few typical examples of its applications in minimising maintenance operating expenses are discussed in this paper and their results are explained to better demonstrate the benefits of the technique. This work aims to prepare for the future applications of the delay-time modelling in railway maintenance policy making.     

集成预防性维护计划的单机调度蚁群优化研究

尽管生产调度与预防性维护计划密切相关,且其共有目标都是提高机床的利用率,但是存在着调度优化上的冲突.为了综合考虑单机情形下的生产调度与预防性维护计划,提出了一种改进的蚁群优化算法,用于解决以总计作业加权完成时间和总计维护成本最小为双目标的生产调度与预防性维护计划的集成模型.同时进行了大量的仿真实验,比较结果表明提出的蚁...     

基于FMEA的污水排放设备维护策略

以污水排放系统的设备为研究对象,采用系统失效模式及后果分析方法(系统FMEA)区分设备的关键等级,综合运用设备失效模式及后果分析方法(设备FMEA)确定各设备的主导故障,定制不同设备的维护策略.通过一具体实例说明运用FMEA定制维护策略的全过程.     

旧设备租赁的周期预防维护策略优化

针对具有一定年龄的旧设备租赁的特殊性,提出周期预防维护策略。该策略综合考虑设备的年龄、预防维护、小修以及惩罚机制等多种因素对成本的影响,建立以出租方维护成本最小化为目标的周期预防维护模型。经算例分析,研究表明,该方法是有效的,并且在实际维护过程中是易于操作的。     

Research on Selection of Equipment Maintenance Modes

1 IntroductionEquipment failure will inevitably occur during a normal production process.Severe equipment failurewill conduce long time deadlock of a production system,lower production efficiency,and add extracost on products.Effective strategy should be adopted so as to reduce failure influence on equipment,reduce production cost and enhance market competition of products.In recent years,high-tech pro-duction equipment are improved,and production rates are more rapid.For the sake of maintain…     

Reliability‐based Optimal Maintenance Scheduling by Considering Maintenance Effect to Reduce Cost

A new reliability‐based optimal maintenance scheduling method is presented that considers the effect of maintenance in reducing costs. An ordering list of element maintenance effects with various maintenance‐interval types is constructed. By means of this ordering list, reliability‐based optimal maintenance scheduling for simple reliability structures and composite reliability systems is then carried out. The properties of the proposed method, such as the evaluation of maintenance cost reduction, the simplicity of the proposed method by sacrificing system availability within the allowance method, the operation decision based on the optimal maintenance schedule, etc., are discussed. With simulations, the effectiveness of the proposed method is verified. Copyright © 2005 John Wiley & Sons, Ltd.     

Optimal Scheduling of Track Maintenance on a Railway Network

To ensure the safety and continued operation of the railway network system, many maintenance and renewal activities are performed on the track every month. Unplanned maintenance activities are expensive and would cause low service quality. Therefore, the track condition should be monitored, and when it has degraded beyond some acceptable limit, it should be scheduled for maintenance before failure. An optimal timetable of the maintenance activities is needed to be scheduled, planning the monthly workload, to reduce the effect on the transportation service and to reduce the potential costs. Considering the uncertainties of the deterioration process, the safety of transportation service, the lifetime loss of the replaced track, the maintenance cost and the travel cost, this article advances an optimisation model for the maintenance scheduling of a regional railway network. An enhanced genetic algorithm approach is proposed to search for a solution producing maintenance schedule such that the overall cost is minimised in a finite planning horizon. A case study is given to demonstrate the application of the method. The case study results were derived by using an enhanced genetic algorithm method, which is specifically developed to deal with the characteristics of the railway maintenance problem. Copyright © 2012 John Wiley & Sons, Ltd.     

A Bayesian Approach to the Scheduling of Preventive Maintenance

This paper presents a Bayesian model for determining minimum cost rate preventive maintenance schedules where historical data are not available. Also, a model to determine appropriate maintenance budgeting policies is presented and discussed.     

Maintenance Strategies and Failure‐Cost Model for Medical Equipment

This paper proposes a mathematical maintenance model that analyses the effect of maintenance on the survival probability of medical equipment based on maintenance history and age of the equipment. The proposed model is simulated in Scilab using real data extracted from maintenance history of anaesthesia machine from Draeger. The analysis using survival approach reveals that conducting preventive maintenance on the selected medical equipment had a positive impact on survival of equipment. The model is then used to analyse the cost of maintenance scenarios, and an appropriate scenario is proposed for anaesthesia machine. A new failure‐cost model is developed, which may be used to calculate the number of failures of equipment and the annual maintenance cost. The proposed models may be used as a planning tool for selecting maintenance strategies for various medical equipments. Copyright © 2014 John Wiley & Sons, Ltd.     

考虑维修时间和惩罚的租赁设备维护策略研究

针对租赁设备维修时间的不确定性,建立考虑维修时间随机性的等周期预防性维护策略。该策略在考虑租赁设备维修时间随机性的同时,综合考虑对出租方的维修惩罚,包括维修时间惩罚、故障总次数惩罚以及可用度惩罚等因素对总成本的影响。从出租方的角度出发,建立以出租方总成本最小为目标的预防性维护策略优化模型。用MATLAB仿真求解出模型的最优预防性维护计划。算例分析表明,考虑租赁设备维修时间随机性和维修惩罚使租赁设备的维护更符合实际情况,能为租赁企业提供有效的设备维护策略。     

A Computer-Aided Graphical Procedure for Scheduling Preventive Maintenance of Electric Power Generating Units

This article attempts to show how computer graphics can assist in computerized development of project-type schedules as exemplified by preventive maintenance scheduling in the electric power industry. The method is equally applicable to the scheduling of maintenance activities in general or, with modification, to devising shift schedules for personnel such as police, nurses, and toll collectors who must provide 24-hour service with changing demand levels. A hand procedure currently used by electric utilities for creating preventive maintenance shutdown schedules for generator units is first described. A mixed integer programming model of the problem is given which is computationally intractable for any realistic-size problems. The same problem using man-machine interaction via a graphics terminal to overcome the computational limitations of the mathematical formulation is then described and illustrated. A proposed extension to improve the speed of solution is also described.     

Using Utility Functions for Aggregate Scheduling in Health Maintenance Organizations (HMO'S)

The multiple attributes and characteristics of the services provided by a health maintenance organization (HMO) are reduced to a common unit of measurement by means of utility functions. This reduction allows the development of a micro-economic aggregate planning model that can be used both for the short and the long term to make optimizing decisions on system inputs and resource allocations. The model is designed to deal with the common revenue- and budget-constrained situations and is directed to maximize the level of service provided by the HMO, according to the management's perceptions of the system characteristics. An empirical short term application of the model is presented and compared against actual management decisions. Data needs and implementation requirements are discussed, along with the managerial implications of this approach.     

生产调度与维护集成的多目标Lorenz非劣遗传优化

研究了一种单机环境下集成生产和维护的双目标优化调度问题。机床的故障间隔时间和平均维修时间服从指数分布,同时结合加工序列相关准备时间。预防性维护活动不能与作业加工同时进行,但与准备时间不相冲突。调度目标是同时最小化作业总计完成时间和机床不可得性。在问题建模的基础上,构造了一种基于Lorenz非劣关系的分类遗传算法(表示为L-NSGA-Ⅱ),详细设计了算法的核心部分。最后,通过大量计算实验,将L-NSGA-II算法与NSGA-II算法进行了比较分析,说明了L-NSGA-II算法的有效性。