An anthropocentric approach to knowledge-based preventive maintenance

It is common knowledge today that application of sound manufacturing concepts and techniques will only provide cost-effective, long-term return when manufacturing functions are totally integrated with the operators, maintenance engineers and other associated personnel. This paper presents a human-centred methodology and its associated knowledge-based tool, to utilize equipment failure information for the purpose of machine down-time minimization. Based upon a structured and rigorous assessment of each breakdown, and combined with total employee participation, continuous improvement of maintenance function and operational effectiveness of equipment can be made a reality.     

以可靠性为中心的维修在核电站维修优化中的应用与创新

以可靠性为中心的维修(简称RCM)是目前国外广泛采用的维修优化方法。本文介绍了RCM分析方法以及该方法在大亚湾核电站的应用情况,并介绍了对RCM决断逻辑进行优化和改进的情况,最后通过实例说明RCM改进后所取得的效果。     

空压机系统的RCM策略实践

阐述了以可靠性为中心的检修模式(RCM)理论观点，并介绍了电厂实施RCM的工作流程，以及如何根据故障模态、故障效应、故障后果分析来确定设备检修方式、制定检修计划的方法。     

以可靠性为中心的维修体系在大亚湾核电站的应用

本文简要阐述了以可靠性为中心的维修(RCM)理念、分析方法在大亚湾核电站的应用,描述了RCM分析成果指导现有状态监测和维修运行活动的程序,以及RCM分析成果在提高系统可靠性方面和降低系统及设备的运行和检修成本方面带来的变化,介绍了利用ENTEK状态监测软件分析设备故障及设备故障处理跟踪流程。     

An experimental research on the rock cutting process of the gage cutters for rock tunnel boring machine (TBM)

This paper proposed an experimental method to investigate the rock cutting process of TBM gage cutters based on the full-scale rotary cutting machine (RCM). The key point of this method is to reconstruct the RCM by inserting three wedges with angles of 10°, 20° and 30° respectively into the space between the cutter base and cutter box. As a result, the rock cutting process of gage cutters with tilt angles of 10°, 20° and 30° can be proceed. Using this method, rock cutting experiments were conducted with penetrations of 2 mm, 4 mm, 6 mm and 8 mm respectively. The testing results were analysed on the rock cutting force, rock debris dimension, specific energy and cutting surface profile, and it was found that: (1) the cutting forces and specific energy of the gage cutter were lower than those of the normal cutter respectively; and (2) the depth of the rock broken zone was smaller than the cutting depth. The testing results can also be used to validate corresponding numerical models and design the layout of gage cutters.     

低压配电设计中几个值得探讨的问题

结合IEC标准．对GB50054—2011《低压配电设计规范》中理解和执行争议较大的第3．1．3条、第3．2．14条和第6．4．3条进行分析。以应用最广泛的TN系统为例,讨论电气隔离的相关要求：以规范条文为线索。探求其中的电气原理;介绍IEC标准中电气防火的要求和进展。     

建立以可靠性为中心的机械设备维修体制

概述了以可靠性为中心的维修理论，介绍了可靠性理论的基本概念、维修思想、发展变革、RCM分析过程的基本问题，以及建立机械设备维修体制的方法步骤。     

纳米SiO2和丁苯胶粉复合改性水泥基材料的强度及抗渗性能

本文研究了单掺丁苯胶粉(SBR)和复掺SBR/纳米SiO₂(NS)对水泥基材料抗折强度、抗压强度、吸水率、抗氯离子渗透系数的影响规律,并采用XRD、DSC-TG、FTIR、SEM-EDS、MIP等手段对水泥基材料水化产物和微观结构进行分析,探究单掺SBR和复掺SBR/NS对水泥基材料强度及抗渗性能的影响机理。结果表明,复掺SBR/NS显著改善了由单掺SBR引起的水泥基材料早期强度下降的问题,单掺SBR和复掺SBR/NS均可降低试样的吸水率、吸水速率和非稳态氯离子迁移系数,且复掺效果优于单掺。微观测试表明:单掺SBR可降低Ca(OH)₂的含量,减少有害孔和多害孔的数量,增加结构整体性;复掺SBR/NS可进一步降低Ca(OH)₂的含量,促进水化反应生成更多C-S-H,提高C-S-H的聚合度,降低最可几孔径,减少少害孔、有害孔和多害孔的数量,降低水化产物的钙硅比,从而增强试样的抗折强度和抗压强度并提高其抗渗性能。     

低掺量偏高岭土改性混凝土抗氯离子渗透性能

对添加了0~6%偏高岭土的混凝土的抗氯离子渗透性能采用电通量法和RCM法进行了综合分析,结果表明偏高岭土增强了混凝土的抗氯离子渗透性能。两种方法均表明,添加了5%偏高岭土的混凝土的抗氯离子渗透性能提高50%~60%。对混凝土水化产物的扫描和透射电子显微镜分析表明,偏高岭土的引入促进了体系的水化,使得结构更为致密,可有效改善体系的抗氯离子渗透性能。     

锂渣复合粉煤灰高性能混凝土的氯离子扩散性试验研究

通过正交试验设计,初步确定锂渣复合粉煤灰高性能混凝土的配合比,然后从中选出几组配合比通过RCM法测定了锂渣复合粉煤灰高性能混凝土氯离子扩散系数,分析了添加锂渣和粉煤灰的高性能混凝土和不添加这两种掺合料混凝土的抗氯离子性能不同的原因,结果表明:添加锂渣和粉煤灰的混凝土的抗氯离子渗透性能明显高于不添加这两种掺合料的混凝土的抗氯离子渗透性能。