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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。 相似文献
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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。 相似文献
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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。 相似文献
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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。 相似文献
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《机械工程与自动化》2017,(4)
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。 相似文献
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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。 相似文献
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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。 相似文献
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Clarence W.DE SILVA 《Instrumentation》2019,(4):72-84
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... 相似文献
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INTEGRAL EQUATION METHOD'S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES 总被引:1,自引:0,他引:1
LI Cheng ZHENG Yanping 《机械工程学报(英文版)》2008,21(6):115-118
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. 相似文献
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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. 相似文献
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The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar... 相似文献
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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.... 相似文献
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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... 相似文献
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分布动态载荷识别的抗噪处理 总被引:2,自引:2,他引:0
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. 相似文献
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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。 相似文献
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J. A. Williams 《Lubrication Science》1997,3(3):267-306
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. 相似文献
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CHEN Sunyi 《机械工程学报(英文版)》2007,20(6):13-17
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. 相似文献