对DF5型机车轴重调整过程的分析及新设想

通过对DF5型机车轴重调整过程的分析,提出了该型机车的轴重调整方法,该方法一直指导着DF5型机车的轴重调整,保证了在铁路线上运营的近1200台机车的轴重均匀。     

HXN5型机车车轮压装不合格原因分析及措施

1问题的提出哈尔滨大功率机车检修段自2013年开始试做HXN5型机车轮对大修,当时HXN5型机车轮对车轮磨耗情况非常严重,有85%以上的机车进行二年检时车轮轮径已经磨耗到限,需要更换车轮进行大修。作为专门从事和谐型内燃机车二年检的机车检修段,承担了哈局大部分HXN5型机车二年检,配备有轮对大修检修生产线1条,车轮立式车床2台,可以承担HXN5型机车轮对大修,并且能     

DFH5型内燃机车车轴齿轮箱修复系统的研制

通过对 DFH5型内燃机车车轴齿轮箱故障的调查与分析,找出故障原因,并在现有的技术条件下,研制出 DFH5型内燃机车车轴齿轮箱修复系统,通过实践取得了良好的效果,同时在DFH21型、GK1C 型内燃机车车轴齿轮箱检修中进行推广和应用,解决了该项技术难题。     

2号机凝泵出口溶氧高原因分析及处理方法

本文以10LDTNB-5PJ型凝结水泵结构为中心,阐述了10LDTNB-5PJ型凝结水泵运行中出现的问题及改造效果。     

HXN5型机车单轴箱拉杆转向架研制

针对HXN5型机车转向架在实际运用过程中出现的轮缘磨耗快等问题,提出了将原导框定位结构改为单拉杆独立一系弹簧定位结构的转向架方案。介绍了该转向架设计思路及各部件结构特点,以及转向架试制、试验情况,并将双司机室HXN5型2001号机车与原导框定位的HXN5型机车车轮磨耗情况进行了对比分析。     

HXN5型机车自动提钩装置改造

1背景2009年5月,HXN5型机车在齐齐哈尔机务段投入运用,运输效率明显提升。为有效解决瓶颈区间通过能力限制,更好地发挥新型大功率机车优势,经充分论证和试验验证,确认了HxN5型机车担当补机的可行性。机车自动提钩技术改造是保障HXN5型机车综合运用效率提高的内容之一。     

SGT5-4000F型燃气轮机转子高速动平衡工艺

介绍了SGT5-4000F型燃气轮机转子特点,根据上海汽轮机厂动平衡设备特点及挠性转子动平衡原理,提出合理的SGT5-4000F型燃气轮机转子高速动平衡工艺方案,并以实例进行阐述。     

两种燃烧室混合气形成过程

本文用油-油喷射模拟方法,研究了C_5型和B 型燃烧室的混合气形成过程,说明了喷注夹角及其它因素对混合气形成方式的影响。给出了C_5和B 型两种燃烧系统的物理模型。模拟试验结论对发动机试验结果作出了合理解释。     

ND5型机车柴油机铁谱磨粒分析

对ND5型机车柴油机机油进行长期的铁谱分析,初步提出了一套系统的ND5型机车柴油机铁谱磨粒分析方法,提供了详细规范的磨粒分类、磨粒特征分析、柴油机磨损类型和较全面的柴油机故障部位诊断规则.     

SGT5-4000F型燃气轮机燃烧室介绍

详细介绍了SGT5-4000F型燃气轮机燃烧室整体及主要部件结构,并对SGT5-4000F型燃气轮机的运行模式进行了介绍。本文对了解先进的重型燃气轮机燃烧室具有积极意义,对设计自己的燃烧室具有较大的启发意义。     

改进的Manchester连锁故障模型在交直流混联电力系统中的应用

针对现有的多种连锁故障分析方法中Manchester模型较符合电力系统实际情况,但却只包含快动态过程、未考虑高压直流输电系统的问题,通过加入直流输电线路的故障判断、交直流潮流计算和系统慢动态过程等环节,对原始Manchester连锁故障模型的计算流程进行了改进,使之适用于交直流混联电力系统,扩大了使用范围。算例分析结果表明,改进后的模型可用于判断多种元件突发故障情况下交直流混联电力系统的连锁故障模式和结果,可为连锁故障的预防和电力系统的安全运行提供参考依据。     

东风4D型客运内燃机车的运用、改进和启示

介绍东风     

增压器故障模式再现研究与对策

模拟再现了增压器在压气机端进不同异物、润滑油通断的情况下,增压器发生故障时的失效模式。通过上述故障再现试验,为查找增压器类似故障原因提供一定的指导。同时通过对故障原因的分析提出了相应的应对措施。     

Dynamic pressure measurements of a hot gas filter as a diagnostic tool to assess the time dependent performance

Dynamic pressure measurements are introduced as powerful tool to detect filter failures at early stage. Data of single recleaning pulses or a time series of recleaning pulses can be used to detect filter failures and changes in filter candle conditions during commissioning and operation. High frequency sensors were used to record recleaning back pressure pulses enabling the detection of filter failures such as leakages or blockages. Changes in filter wall resistance due to patchy cleaning or depth filtration can be detected much faster with dynamic pressure measurements than with conventional differential pressure measurements. Parameters derived from dynamic pressure data were monitored over time and compared with reference data. The method complements standard pressure difference measurements. Dynamic pressure measurements were conducted at a hot gas filter applying a coupled pressure pulse (CPP) recleaning system.     

Case studies in disaster—A coded approach

By studying published information on various disasters throughout history, various patterns emerge. In studying these patterns we are able to deduce whether the failures were preventable or not. The methodology of this paper links all failures, as far as possible back to some human error, for example, design error, maintenance error, operator error, etc. Nine failures were analysed from the following industries: shipping, railways, airlines, nuclear power, space exploration and chemical plant. Some failure sequences are simple, such as the Flixborough chemical plant explosion, while others are more complex, such as the Three Mile Island nuclear plant disaster. Of all possible types of error, avoidable operator error predominates.     

汽轮机液压转速调节系统几种常见故障诊断分析

讨论几种常见故障的数学模型,并根据这些模型做了仿真计算,同时结合仿真结果,对这些故障进行了诊断分析。     

空气进入引起柴油机冷却水、燃油压力低故障分析

针对某船用V型柴油机在高工况时出现的冷却水压力低和燃油压力低故障，结合淡水泵及燃油系统原理对故障现象进行分析。分析表明:二种故障均为因空气进入管路系统引发压力降低或波动所致。在此基础上提出了改进措施。     

Repair welding technologies for heat recovery steam generator tubing

Abstract

A number of premature failures have been observed in heat recovery steam generators, both along the length of finned tubes and at attachment locations where tubes are joined to the upper or lower header. Such failures are expensive to correct; furthermore, poor welding access and repair practices often result in recurrence of the failures with existing welding technology. Two separate welding technologies under development to address tube failures are described. In the first, for failures along the length of the tube, damaged sections are severed from the existing tube and replaced via gas metal arc welding from the inside of the tube. A welding head has been specifically designed to perform this inside out 'window weld' repair. The second technology addresses tube to header attachment damage via removal of the existing stub from the inside of a header and its replacement with a slightly oversized and tapered tube. The two technologies identified have the potential to give significant improvements in repair of heat recovery steam generator tube failures by original equipment manufacturers (OEMs) and repair organisations.     

谈锅炉转机运行故障判断的方法和处理

结合典型实例介绍了运行中判断锅炉给水泵、风机等转动机械故障的基本分析方法和处理方法。通俗易懂 ,对专业技术人员和值班人员判断并防止扩大转机故障、减少损失、正确及时地处理故障具有现实指导意义。     

基于威布尔分布法的某型发动机MTBF计算

对国内某型现役航空发动机的故障进行了收集整理,分别运用均值法、两参数和三参数的威布尔分布法对该型发动机的89起故障的故障间隔时间进行统计分析,得到了该型发动机的MTBF值。结果表明,威布尔分布能够较好地反映该型发动机故障间隔时间的真实分布规律,所得的MTBF结果更加合理可信。