复荷载单边止挡轴箱的结构强度评估

依据UIC 615-4及EN 12082规范,对某机车车辆有限公司出口南非的机车转向架轴箱进行载荷分析,确定了其在计算分析时的载荷工况,利用ANSYS有限元分析计算了该轴箱在超常载荷和运营载荷下的静强度指标,用Goodman图校核了疲劳强度。计算分析结果表明:轴箱静强度和疲劳强度均满足要求,该转向架轴箱安全可靠。     

30t大轴重机车转向架轴箱体的设计

介绍了30t大轴重机车转向架轴箱体的设计,分析了轴箱体各部分结构功能特点。依据UIC615-4为载荷标准,确定了在计算分析时的载荷,并利用ANSYS Workbench计算了轴箱体静强度,用Goodman图校核了疲劳强度,计算分析结果表明,轴箱体的静强度及疲劳强度均满足要求。     

定子铁心叠压设计中的接触有限元分析

采用接触非线性有限元分析方法,借助于ANSYS软件对电机定子铁心叠压骨架的整个结构进行强度和刚度的计算分析,根据计算结果提出改进方案,为电机的结构设计提供了一种有效的设计计算方法.     

HXD3型电力机车轴箱体裂纹原因分析和工艺改进

对HXD3型电力机车轴箱体裂纹产生原因进行分析,提出轴箱体的改进措施。改进后轴箱体的质量得以提高,并保证机车的正常运行。     

控制抱轴箱变形的对策

国内外时速120km的内燃机车,大多采用电动机悬挂方案的滚动抱轴箱结构。该结构的优点是：结构简单,装配调整用维修方便,能有效减少电动机对机车动轮的阻力,从根本上消除了电动机滑动抱轴结构的碾瓦、油箱漏油窜油现象,同时明显改善了电动机索引齿轮的啮合状态,从而提高了齿轮的运用寿命和机车的可靠性。某公司与国外技术合作生产的新型机车上就是采用的滚动抱轴箱结构。抱轴箱在车轴对上组装结构如图1所示。     

HXN5内燃机车轮对滚动抱轴箱裂损故障分析及处理

滚动抱轴箱是轮对上的重要关键部件之一,针对HXN5内燃机车轮对滚动抱轴箱Ⅰ区裂损的问题,本文从加工工艺、使用概况及磁粉探伤等方面对其原因进行分析,并提出改进措施。     

长大货物车轴箱体静强度试验研究

为适应THDS轴温探测系统,部分长大货物对轴箱体进行设计改进,本文以某型长大货物车轴箱体为研究对象,参照TB/T 1335-1996,根据轴箱体的受力状态进行载荷计算,探讨了轴箱体现有静强度试验方案,选择单轴箱体的方案在强度试验台上对该轴箱体进行静强度试验,得出实测应力值,建立有限元模量,分析轴箱体的强度。结果表明,轴箱体上各测点仿真值与实测应力值误差小于10%,且小于材料的许用应力,轴箱体静强度满足要求。     

机车转向架构架静强度设计方法

运用有限元技术对某机车转向架构架进行强度仿真计算及试验验证分析,以DF4D内燃机车转向架构架为例,详细介绍了客车转向架构架强度的分析方法,利用仿真计算与试验测试相结合的方法能较好地对构架静强度进行设计,为机车可靠运行提供理论依据.     

高速铁路列车轴承疲劳寿命计算方法研究

铁路列车轴箱轴承是列车运行系统中直接关系到列车安全的重要部件。随着列车运行速度不断提高,对其疲劳寿命进行估计和预测是十分必要的。针对铁路高速列车转向架系统中使用的双列圆锥滚子轴承,建立三参数威布尔模型进行轴承疲劳寿命的计算。由于轴箱轴承工作环境较为特殊,负载复杂且实际载荷谱难于确定,因此采用铁路机车车轴强度计算的方法进行轴承受力分析,提出了一种新的理论计算轴承基本额定寿命的方法,从而估计出了不同运行速度、不同可靠度条件下的轴承疲劳寿命。该方法可为铁路高速列车轴承的选用和寿命估计提供理论支持。     

和谐型机车走行部故障救援方案和救援器具的研究

介绍了针对和谐型机车轴箱轴承、抱轴承或空心轴轴承等发生烧损固死、轮对不能转动而提出的救援方案。以HXD2B型机车为例,详细阐述了救援方案和救援器具,通过建模分析和试验验证,说明使用该方案和器具可将故障轮对悬离钢轨,迅速开通线路,产生显著的经济效益和社会效益。     

基于零件强度衰减的螺栓抗挤压疲劳可靠性分析研究

螺栓联结是机械系统中常见的结构,联结螺栓通常要受到联结装置接触面的挤压,从而导致螺栓接触面压溃失效,螺栓的失效是其抗挤压强度可靠性下降到一定程度的体现。结合机械零件强度衰减理论分析了螺栓抗挤压强度可靠性随时间的下降的过程,最后通过举例验证了这一结论。     

瓦楞纸箱抗压强度的计算方法及强度提高的优化措施

介绍瓦楞纸箱的抗压强度的计算方法，并提出提高纸箱抗压强度的几点思考。     

Contact strength calculations

For the example of a roller bearing, some contact strength problems and calculation principles are considered. Quenched high-strength steel parts of various shapes are investigated, taking account of friction.     

Industrial strength hypermedia

Hypermedia systems offer a way of managing large quantities of information by mapping the high-level relationships between underlying elements. But developing hypermedia in the context of industrial applications demands new methodologies. This article discusses some of the hurdles in the path of introducing industrial-strength hypermedia, looking at issues involved in designing, linking and delivery across the manufacturing enterprise     

Effect of Lack of Penetration on the fatigue strength of high strength steel butt weld

Fatigue tests are performed to evaluate the fatigue strength of high strength steel containing partial penetration butt weld and full penetration butt weld. The influence of the unwelded ligament (Lack of Penetration) in the partial penetration welds on the fatigue life is analyzed for various LOP sizes. For full penetration welds, the fatigue crack initiated at the weld toe and propagated to the HAZ. For partial penetration welds, however, the fatigue cracks initiated at the LOP section and propagated to the weld metal (or weld toe) for the considered LOP sizes (from 2mm to 4mm) reducing the fatigue strength. Consequently, the increament of the LOP size yield in the fatigue life degradation by some extent.     

大吨位自卸车货厢高强度钢板强度等代设计

对大吨位自卸车货厢高强度钢板等代设计问题进行了研究,以弹性力学和板壳理论为基础,推导出利用高强度钢板进行强度等代设计时板厚的计算公式,给出了具体的等代设计流程图,并对大吨位货厢进行了轻量化设计。在不改变货厢原结构情况下,实现了货厢减重1679.757kg,约32.95%,取得了较好的轻量化效果。     

Measurement of unsaturated shear strength parameters of silty sand and its correlation with unconfined compressive strength

Compressive strength and direct shear testing parameters on unsaturated soil are often used in analysis and design of several geotechnical infrastructures. Rarely, any attempt has been made to quantify shear strength of unsaturated soil under different net normal stress conditions. The objectives of this study are to quantify shear strength parameters of unsaturated silty sand and to establish a simple correlation of it with unconfined compressive strength. Consolidated drained direct shear tests and unconfined compressive strength tests were performed to determine shear strength of unsaturated completely decomposed granite (CDG) soil. To interpret this, a series of typical soil water characteristic curves (SWCC) of CDG soil under different net normal stresses were also measured. Experimental results show that the unsaturated shear strength significantly increases with increase in net normal stress and matric suction. A new model for prediction of unconfined compression strength of unsaturated soil from shear strength and initial suction was proposed. The predictions from newly proposed model were found to be consistent with the measured unconfined compressive strength. This correlation can be useful in economical and rapid design/analysis of geotechnical infrastructure.     

Logix 齿轮的强度研究

分析Logix齿轮的接触强度 ,并利用有限元法对渐开线齿轮和Logix齿轮的弯曲强度作对比计算