机械液压设备维护技术分析

做好对液压设备的使用与维护,延长其使用寿命.在重视液压系统的维护管理的基础上,采取有效的措施防止故障的发生.     

变电站设备常见故障诊断及维护措施

在变电站的运行过程中,不可避免地会出现故障。对于故障如果不能及时诊断并处理,轻则造成电流增大,电压下降,危及设备安全使系统无法正常运行;重则将导致电力系统对用户的正常供电局部甚至全部遭到破坏。因此必须提高故障诊断技术,并加强维护,减少故障的发生。本文从变压器和电流互感器两方面的探讨了其常见故障的诊断及维护措施。     

浅谈500kV变电站直流系统的运行及维护

直流系统是整个500kV变电站中的核心,其为断路器、应急电源、自动设备、信号设备等提供直流电源,在500kV变电站运行过程中,一旦直流系统发生运行故障,必须会影响500kV变电站的安全运行,因此应特别重视直流系统运行维护,结合直流系统故障或者异常情况,按照500kV变电站运行要求,有针对性地采取有效运行维护措施,消除故障隐患,保障500kV变电站的稳定性和安全性。本文分析了500kV变电站直流系统接地故障维护和异常处理方法。     

基于可靠度限制的PM与EPQ整合模型

针对系统可靠性随年龄增加而降低的现象,将设备维护策略引入经济生产批量,建立了一种基于系统可靠性限制的预防维护策略(PM)与经济生产批量(EPQ)整合模型。模型对于周期内的故障采用最小维护处理,当系统可靠度降低到设定阈值时对系统进行预防维护。在模型基础上,运用更新过程理论,通过建立包含设置成本、存货成本、最小维护成本和预防维护成本在内的成本函数,导出使长期单位时间期望成本最小的最佳预防维护策略(R*,N*),并得出经济生产批量Q*。最后,通过数值算例的分析说明了模型的有效性。     

通信电源的使用与维护

通信电源作为通信系统的"心脏",一旦发生故障,可能导致通信系统全部中断,因此在通信网中必须保证有高可靠性的、不间断供电的电源系统,从通信电源的组成入手,论述通信电源的维护与检修以及一些故障处理方法。     

SDH设备误码分析及维护定位

SDH设备中产生的误码指的是在信号传输过程中，信号码元发生了错误。具体来讲，误码是设备间在接收与发送数字信号的时候，个别数字产生了差错。充分理解和掌握误码性能事件，是做好SDH系统维护的基础，维护人员才能够快速准确的定位找到故障的根源。本文介绍了SDH设备误码的基础，并通过对以往维护中出现的问题案例的分析，总结SDH误码问题故障处理的思路、方法、步骤以提高维护人员在误码处理过程的效率。     

论汽车强制维护的必要性

有人说:"汽车是让修理工给修坏的",所以在汽车出现故障后不得已才把汽车送到修理店进行修理.当然不排除个别修理店为图效益,服务不到位的做法.但在汽车没出现故障之前对汽车作定期的强制性维护,可消除汽车隐患,减少故障发生的几率,提高汽车行驶的安全性,对车主来说是一项花少本获大利的高招.从三个方面进行论述,说明对汽车进行强制性维护的必要性.     

中尺度自动站的日常维护和故障处理

通过对中尺度自动站的日常维护和故障处理工作的分析,综合归纳出自动气象站在日常维护维修中应注意的问题。认为加强自动站维护,重视仪器的各个巡视环节,是保障中尺度自动站运行的关键,当出现故障时,在确保安全的基础上依据电原理进行逻辑分析,逐步排除。     

浅议振动筛的日常维护与故障处理

振动筛是煤炭筛分和洗煤系统中的主要设备，其维护和故障处理工作对于选煤厂的正常运转具有重要作用。文章对振动筛的日常维护和常见故障的处理进行了阐述，对于选煤厂做好振动筛的维护工作具有一定的参考作用。     

SDH网络日常故障处理与维护工作重点分析

文章首先就SDH系统的相关概念以及特征做出深入分析,而后就故障处理原则、常见故障等问题进行了总结,为提升SDH系统维护工作和故障排除工作效率的提升提供参考。     

基于机会维修策略的预防性维修优化模型研究

为了利用系统内故障部件维修的机会,考虑部件之间在维修方面存在的相关性情况,提出了将机会维修信息融入系统预防性维修的优化模型．该模型在比较按机会预防性维修和按计划预防性维修期望效益的基础上,以系统内故障时机为优化变量、部件维修费用率最小化为目标进行系统预防性维修优化,使确定部件在不同的故障来源时机可提前预防性维修的阈值．最后通过算例,表明不同故障的机会维修阈值对部件预防性维修效果的影响差异,为系统预防性维修决策提供有力的支持．     

An Analysis of the Deferences between Old and New Maintenance Concepts

Beforethe'50s,maintenancemainlywasakindofskillandwasshortofagUidetoSystematictheoryandmaintenanceprocesswasakindofrewordathardtime.AsdevelOPmentofdelveofintellectUalization,automationofequipment,maintenancecostrosesteeply.Availabilitywascontinuouslydecreasing,andexistingmaintenanceProcesscouldnotadapttoobjectiverequirements.From1960,thecivilaviationofAmericahadexploredthebasiclawofaoplanemaintenanceintheuseofmodemsciencetechnology[l].UPtothelate'6()s,reliability-centeredmaintenancetheorywa…     

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.     

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…     

The influence of condition-based maintenance on workforce planning and maintenance scheduling

Condition-based maintenance (CBM) is generally considered an attractive maintenance policy for a single component: it uses the operating condition of the component to predict a failure event and therefore tries to avoid any unplanned downtime and unnecessary maintenance activities. However, operations managers tend to be much more interested in optimising the performance of the entire asset-system, where the grouping of maintenance activities and the availability of maintenance workers may play a role. Therefore, this paper focuses on the impact of using either CBM or age-based replacement (ABR) in serial and parallel multi-component systems (1) without worker constraints, (2) with a single internal maintenance worker, and (3) with external maintenance workers with a significant response time. With an internal maintenance worker, the sequential execution of maintenance activities prevents efficiency gains in the serial configuration and here CBM performs better. Also in the parallel configurations, the efficiency under CBM is generally better than under ABR. However, with external maintenance workers, CBM is not able to group maintenance activities as well as ABR, which results in a lower efficiency in the serial configuration. CBM performs better than ABR with respect to total maintenance costs, while ABR results in a smoother maintenance plan.     

The Method of Mission Oriented Maintenance

In a real application,equipment in good condition sometimes have to be repaired because the equipment does not satisfy the requirements of the mission; However, it is not necessary to repair some equipment with failures because the failures do not affect the mission completion. In these cases, maintenance activity guided by present maintenance methods may sometimes affect the mission completion in time or bring about extra maintenance. To over-come the shortage of present maintenance methods, we propose an idea and method of mission oriented maintenance (MOM) to deal with the maintenance policy on these kinds of prob-lems. This method can work out different maintenance policies corresponding to different missions with full consideration of missions and mission requirements for the equipment.     

微表处在高速公路养护中的应用

微表处作为高速公路预防性养护措施。通过调查沥青路面的主要病害,对微表处的适用条件以及性能进行了分析,提出微表处的材料标准、施工流程等相关技术要求,介绍了江苏高速公路的应用情况。     

A literature review on selective maintenance for multi‐unit systems

Selective maintenance is regarded as a type of profit‐generating maintenance policy, playing an important role in balancing limited maintenance resources with system performance. Since 1988, increasing interest has been focused on this research area. Nevertheless, to the best of our knowledge, there is a lack of critical reviews of selective maintenance. This paper is the first systematic review focusing on this relevant topic. In this work, a definition and some specific features of selective maintenance are elaborated. Based on these features, a set of criteria that have been considered in selective maintenance optimization are summarized into 3 categories: system characteristics, maintenance characteristics, and mission profile characteristics. Based on these criteria, a comprehensive literature review on selective maintenance is undertaken. The solution approaches, as well as a general procedure for selective maintenance optimization, are discussed. Finally, some possible directions for further research are provided.     

A full history proportional hazards model for preventive maintenance scheduling

This paper is concerned with the development of a realistic preventive maintenance (PM) scheduling model. A heuristic approach for implementing the semi-parametric proportional-hazards model (PHM) to schedule the next preventive maintenance interval on the basis of the equipment's full condition history is introduced. This heuristic can be used with repairable systems and does not require the unrealistic assumption of renewal during repair, or even during PM. Two PHMs are fitted, for the life of equipment following corrective work and the life of equipment following PM, using appropriate explanatory variables. These models are then used within a simulation framework to schedule the next preventive maintenance interval. Optimal PM schedules are estimated using two different criteria, namely maximizing availability over a single PM interval and over a fixed horizon. History data from a set of four pumps operating in a continuous process industry is also used to demonstrate the proposed approach. The results indicate a higher availability for the recommended schedule than the availability resulting from applying the optimal PM intervals as suggested by using the conventional stationary models. © 1997 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。