动力集中型动车组碰撞能量管理方案设计研究

动车组可分为动力分散型动车组和动力集中型动车组。本文以动力集中型动车组为研究对象,首先通过碰撞能量管理的计算确定了吸能参数,然后根据吸能参数和相关规范设计了吸能装置。为其他动力集中型动车组碰撞能量管理方案的设计提供了参考。     

关于铁路动车组检修设备管理

铁路动车组检修设备管理水平的高低对铁路动车组的安全稳定运行有着直接的影响。为了确保铁路动车组在安全稳定的环境下运行，保证人们生命财产安全，必须加强对铁路动车组检修设备设备管理的研究。本文针对我国铁路动车组检修设备管理存在的一些亟待解决的问题进行了分析，并对铁路动车组检修设备管理存在问题提出了笔者的几点建议。     

动车组牵引电机故障分析及诊断

基于目前我国高速动车组列车的发展情况,为提升动车组牵引电机运行的稳定性,保证动车组安全运行,通过文献综述法、对比法等研究手段对动车组牵引电机故障分析及诊断进行了研究,提出了基于SVM的动车组牵引电机故障诊断方法、基于粒子群优化支持向量机的动车组牵引电机故障诊断方法等,此类故障分析及诊断方法均行之有效。     

CRH380B系列动车组车门常见故障检查处理方法

高速动车组诞生以来,以其安全、快捷和舒适等特点在世界上多个国家得到了广泛的应用和发展。高速动车组是高速铁路发展的核心。高速动车组运行时受到空气动力学作用,对动车组结构提出了更高的可靠性和气密性要求。作为动车组的重要装备,高速动车组一般使用塞拉门结构代替普通的折页门结构。其是旅客上下车及列车发生火灾等需要疏散时的主要通道,其运行状态的好坏直接关系着旅客的乘坐舒适性与安全性。在历年检修运用过程中,车门故障成为影响动车组运行安全的一项重要因素,因此,研究分析动车组车门故障及故障处理方法具有重要的意义。本文以CRH380B型高速动车组的边门系统为研究对象,对动车组车门故障进行分析,按故障分类分析故障点,并提出了相应的故障处理措施。     

动车组牵引系统再生制动工况仿真分析

以CRH3型动车组牵引系统为研究对象,结合动车组牵引系统工作原理,运用MATLAB/Simulink建立仿真模型,模拟了动车组从牵引传动到再生制动的运行工况,为动车组牵引系统的参数优化奠定了理论基础。     

动车组真空断路器智能化拆装工装的设计

基于动车组检修的需求与原有动车组真空断路器拆卸过程中存在的问题,设计了动车组真空断路器智能化拆装工装。介绍了这一工装的整体要求,分析了这一工装的结构,并给出了具体技术参数。应用这一工装,可以提高动车组检修的稳定性与工作效率。     

动车组列车控制管理系统简述

介绍了动车组列车控制管理系统的基本构成以及主要功能,阐述了动车组列车控制管理系统的冗余设计要点,为动车组列车控制管理系统设计提供了参考。     

动车组制动技术的研究

随着干线铁路动车组的国产化和城市轨道交通建设的进行,国家对动车组技术的研究、对制造部门动车组系统的技术支持、对运用部门人员培训等工作提出了迫切的要求,而对动车组系统中的关键技术一制动技术进行理论联系实际的研究就是当前重要的任务之一。本文结合日本动车组CRH2对动车组制动方式、制动系统组成、指令及原理等进行了探讨研究,希望能达到抛砖引玉的效果。     

动车组车载避雷器检修技术研究

避雷器是动车组安全运行的重要保护设备之一,其稳定、可靠运行对保证动车组的安全供电起着重要作用。现从影响避雷器寿命的因素入手,对动车组避雷器的检修技术进行了分析研究,并介绍了CRH1型动车组交流无间隙金属氧化锌避雷器的检修方法。     

CRH2统型动车组牵引变流器MMOC1故障分析与处理

2015年以来,CHR2统型动车组共发生多起MMOC1故障,影响了动车组的运营秩序。本文针对CRH2统型动车组MMOC1故障可能的原因进行阐述与分析,为CRH2型动车组检修技术人员提供参考。     

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.