A minimum cost flow model for level of repair analysis

Given a product design and a repair network for capital goods, a level of repair analysis determines for each component in the product (1) whether it should be discarded or repaired upon failure and (2) at which location in the repair network to do this. In this paper, we show how the problem can be modelled as a minimum cost flow problem with side constraints. Advantages are that (1) solving our model requires less computational effort than solving existing models and (2) we achieve a high model flexibility, i.e., many practical extensions can be added. Furthermore, we analyse the added value of modelling the exact structure of the repair network, instead of aggregating all data per echelon as is common in the literature. We show that in some cases, cost savings of over 7% can be achieved. We also show when it is sufficient to model the repair network by echelons only, which requires less input data.     

关于改进军用飞机航空器材修理工作的思考

本文对军用飞机航空器材修理工作的重要性进行了阐述,对当前航空兵部队在航空器材修理工作中存在的主要问题进行了梳理和分析,并就如何改进给出了建议。     

数控机床进给系统故障维修分析

进给系统作为数控机床的核心部件,故障率较高,故障原因复杂,维修周期长,所以故障的快速诊断变的尤为关键。文章主要根据笔者多年维修经验,对进给系统出现的常见故障进行分析总结提出解决的思路,供大家参考。     

浅谈CT球管的维修养护及故障分析

CT球管是CT机最昂贵且最易消耗的核心部件,其维修养护将直接影响到CT机的正常运行,进而对医院的经济效益和社会效益也带来直接的影响。文章就CT球管使用过程中的常见故障及日常维修养护进行介绍,对CT球管的维修和养护具有一定的参考价值,为延长球管使用寿命,降低医院成本提供可行建议。     

液压动力钳使用过程中故障诊断与排除方法的研究

液压动力大钳在钻井和修井作业过程中经常会出现一些故障和问题,用合理的方法及时排除,对缩短钻修井周期,降低钻修井成本,调动工人的工人积极性都会带来正面的作用。     

三相异步电动机的常见故障与检修方法

电动机是把电能转换成机械能的设备,它是利用通电线圈产生旋转磁场并作用于转子形成动力旋转扭矩的现象制成的。因此,在现场运行中经常会发生故障。本文从机械和电气两方面详细阐述了三相异步电动机的常见故障与检修方法。     

非货币性交易的会计处理及其比较研究

在非货币性交易的会计处理中,最重要的是如何确认资产的入账价值,对于不同的情况有不同的计算方法,这些情况包括:不涉及补价的非货币性交换、涉及补价的非货币性交换以及在涉及多项资产的非货币性交换中,不涉及补价与涉及补价的会计处理方法都有所不同,而在涉及补价的非货币性交换中,还要计算应在当期确认的收益。本文试图探讨对于非货币性交易,换入资产的入账基础采用何种方法更为合理,以及新准则中换入存货的计价问题。     

Maintenance expenditures and indeterminacy under increasing returns to scale

This paper develops a one-sector real business cycle model in which competitive firms allocate resources for the production of goods, investment in new capital and maintenance of existing capital. Firms also choose the utilization rate of existing capital. A higher utilization rate leads to faster capital depreciation, and an increase in maintenance activity has the opposite effect. We show that as the equilibrium ratio of maintenance expenditures to GDP rises, the required degree of increasing returns for local indeterminacy declines over a wide range of parameter combinations. When the model is calibrated to match empirical evidence on the relative size of maintenance and repair activity, we find that local indeterminacy (and belief-driven fluctuations) can occur with a mild and empirically-plausible degree of increasing returns: approximately 1.08.     

安钢中板轧机牌坊修复

轧机牌坊的磨损,会影响轧钢作业的质量和效果。为了解决这一问题,需要对轧机牌坊有效的修复。基于此,本文详细论述了安钢中板厂2800MM轧机牌坊,平衡缸安装位磨损、上、下支承辊滑板面、支承辊滑板面螺栓孔损坏在线修复方法。结果表明这种在线处理方法,修复效果良好,有着很高的实用价值和经济效益。     

发动机电缆修理方法研究

发动机电缆结构复杂,故障情况多样,常规的电缆修理方法不仅成本较高,而且维修效果并不是很理想。由于发动机电缆的修理质量,直接关系到发动机使用的可靠性。因此,本文通过对一款大型发动机电缆的故障分析、研究,探索出一套提高该型发动机电缆修理质量的修理方法,以实现维修效果的提升,降低维修成本的目的。