汽车发电机常见故障原因分析与排查方案研究

随着我国人民的物质生活质量和经济能力的不断提高,汽车开始成为人们日常交通出行的重要工具,其运行的电源供应均来自于发电机。发电机的正常运转是汽车正常使用的重要保证。但在发电机的日常运行中,总会有问题或者故障出现影响着汽车的正常使用。因此本文就发电机的常见故障为出发点,对故障的原因和排查方案进行了重点分析。     

Wilson型天然气发电机维保标准的实施与应用

对于一些外电匮乏但却具有丰富的气源的的输油站场,天然气发电机就是一个很好的选择,但设备的安全可靠直接关系到输油站场的正常生产工作,因此应加强提高对天然气发电机日常维护保养工作。针对某项目现场的天然气发电机组在日常维护保养中出现的因为维保规范标准不统一而带来诸多问题,提出一套经过理论和实践双重检验有效且实用的规范,揭示出一套合理、实用、高效的规范对生产所起的指导作用和带来的经济效益。     

浅谈CINRAD／CD型天气雷达的维护保养

为确保新一代天气雷达CINRAD／CD汛期正常运转,必须认真做好雷达汛前的年维护保养工作。本文根据新一代CINRAD／CD型天气雷达系统的组成,遵循一定的维护规则,编制了一套维护流程,总结出了行之有效的维护方法,并对年维护的重点、技巧及方法做了详细地介绍。     

电梯限速器定期检验技术及常见问题的思考

限速器是电梯发生超速和断绳时起保护作用的安全控制部件的重要组成部分,必须保证其动作灵敏、可靠运行,因此,电梯限速器的监督检验、定期检验和日常维护保养尤为重要。文中结合电梯检规的检验内容与要求,介绍了限速器的定期检验技术、定期检验和维护保养中应注意的常见问题。     

第四讲 乡镇企业设备现场管理(下)

六、设备的维护保养及其规程设备的维护保养是设备安全运行的重要保证.操作工人通过对设备的检查、调整、保养、润滑和维修来减少设备的磨损,提高设备完好率、降低故障率,延长设备的使用寿命.当前十分强调企业的产品质量和经济运行质量,搞好设备的维护保养起着十分重要的作用.1.设备维护保养的基本要求设备维护保养必须做到整齐、清洁、润滑、安全的“四项要求”.2.设备维护的内容及分类设备维护保养的分类,是根据其保养内容、要求来划分的,一般分为日常维护保养和定期维护保养(一级保养、二级保养).这是经过多年实践总结出来的一套行之有效的设备维护保养制度,在有些地区称为“三级保养制”.这项制度体现了专群结合,突出了维护保养在设备管理中的地位和作用;贯彻了计划检修与维护保养并举的方针,提高了操作人员维护保养设备的知识和技能.(1)设备的日常维护保养     

汽车交流发电机轴承选择和使用探讨

汽车交流发电机是汽车电气系统的重要组成部分,其工作性能与使用寿命将影响到汽车整体的可靠性。轴承是汽车交流电机的关键部件,由于轴承在使用中的工作环境问题以及复杂的运行工况使其更容易发生失效,进而导致交流发电机发生故障而不能正常运行。选择合适的轴承是保证其交流发电机正常运行的前提,只有根据工作负载、工作环境等参数合理选择轴承的类型并合理使用与做好日常维护等工作,才能有效提高轴承的可靠性从而提高汽车交流发电机的使用寿命。     

L波段雷达的维护与保养

L波段二次测风雷达是701型测风雷达的更新换代产品,与701测风雷达相比其技术更为先进,自动化程度更高。做好雷达的维护保养工作,对保障探测正常进行以及延长雷达使用寿命显得尤为重要。文章介绍了雷达的维护、保养和故障维修工作中的注意事项。     

关于矿用掘进机液压油的污染与保养

分析了掘进机液压油污染物的常见形式,以及液压油污染对掘进机运行可靠性造成的不良影响,结合矿用掘进机实际情况,分别从掘进机现场工作阶段以及日常维护保养阶段两个层面详细阐述了液压油的维护保养控制措施,以期对提升掘进机运行可靠性具有实践意义。     

制药企业HVAC系统的运行管理

从HVAC系统基本知识入手,通过维护保养制度,检测与修理,风管系统、空调机组、过滤器的维护保养几方面探讨了HVAC系统的运行管理;同时,也阐述了HVAC系统的日常监测。     

电梯维修保养中的常见问题及对策探讨

在城市现代化的进程中,高层建筑的兴起也带动电梯的增加,作为现代高层建筑常用的交通工具,其维护保养水平,将直接影响电梯的使用效果。因此如何维持电梯正常运行,提高电梯垂直运输的可靠性成为人们日益关注的问题。本文将从电梯在日常使用中可能出现的问题出发,深入研究优化电梯维护保养水平的对策,以供相关从业人员借鉴学习。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.