铁路货车钩缓装置钩尾扁销螺栓断裂原因分析

铁路货车钩缓装置中的钩尾销螺栓在螺杆近方头一侧根部位置发生断裂。采用微观分析方法分析了该螺柱断裂原因。综合分析表明：该断裂螺栓方头一侧可能仅局部加热后锻打成四方头,并发生过热,造成在方头一侧的螺柱根部形成马氏体组织和魏氏体组织过渡的U型区域。不良组织的存在增大了钢的脆性,冷加工性能大大降低,在U型区域和螺柱表面交界处萌生了微细裂纹。当钩尾扁销螺栓在列车运行过程中受到过大的冲击时,该螺栓上的微细裂纹在螺栓靠近方头一侧存在的沿轴向的拉应力和螺栓正常紧固力的合力联合作用下张开并迅速扩展,造成螺栓断裂。     

应用防错技术实现质量零缺陷

介绍了防错技术的定义和起源,举例说明了防错技术的分类和特征,并分析了防错技术的作用应用范围;提出潜在失效模式分析、数据库知识管理以及防错分析三种方法是防错实施的重点。以此为基础提出防错技术在零缺陷质量目标下的七步实施模式。     

一种显象管的光栅对准的新方法

介绍一种显像管内磁偏转线圈在屏上形成的矩形光栅与矩形屏对准的新方法。该方法主要特点是利用管内磁偏转线圈产生的磁场进行水平扫描作为基本标准。根据此标准在磁偏转线圈组件上作出标志,然后利用模具将该标志与电子枪中三个电子束排列方向进行对准。制成电子枪偏转组件为一体的装置。在封口前利用管颈二侧的屏的平分线的标志线使该装置与屏对准。该方法简单可行。     

Collaborative Simulation and Testing of the Superconducting Dipole Prototype Magnet for the FAIR Project

The superconducting dipole prototype magnet of the collector ring for the Facility for Antiproton and Ion Research （FAIR） is an international cooperation project. The collaborative simulation and testing of the developed prototype magnet is presented in this paper. To evaluate the mechanical strength of the coil case during quench, a 3-dimensional （3D） electromagnetic （EM） model was developed based on the solid97 magnetic vector element in the ANSYS commercial software, which includes the air region, coil and yoke. EM analysis was carried out with a peak operating current at 278 A. Then, the solid97 element was transferred into the solid185 element, the coupled analysis was switched from electromagnetic to structural, and the finite element model for the coil case and glass-fiber reinforced composite （G10） spacers was established by the ANSYS Parametric Design Language based on the 3D model from the CATIA V5 software. However, to simulate the friction characteristics inside the coil case, the conta173 surface-to-surface contact element was established. The results for the coil case and G10 spacers show that they are safe and have sufficient strength, on the basis of testing in discharge and quench scenarios.     

虚拟样机技术在FPSO系泊力监测系统设计中的应用

针对难以直接测量FPSO软刚臂系泊系统受力的问题,在对软刚臂系泊系统运动特性进行分析的基础上,提出基于姿态响应的系泊力间接测量方案,通过测量系统角度变化计算系泊力.用Adams建立系泊系统虚拟样机模型,将通过角度变化计算得到的系泊力与仿真得到的系泊力进行对比,两者吻合较好,验证设计方案的正确性.通过在FPSO现场的实施证明测量方案的可行性.     

A classifier learning system using a coevolution method for deflection yoke misconvergence pattern classification problem

Deflection yoke (DY) is one of the core components of a cathode ray tube (CRT) in a computer monitor or a television that determines the image quality. Once a DY anomaly is found from beam patterns on a display in the production line of CRTs, the remedy process should be performed through three steps: identifying misconvergence types from the anomalous display pattern, adjusting manufacturing process parameters, and fine tuning. This study focuses on discovering a classifier for the identification of DY misconvergence patterns by applying a coevolutionary classification method. The DY misconvergence classification problems may be decomposed into two subproblems, which are feature selection and classifier adaptation. A coevolutionary classification method is designed by coordinating the two subproblems, whose performances are affected by each other. The proposed method establishes a group of partial sub-regions, defined by regional feature set, and then fits a finite number of classifiers to the data pattern by using a genetic algorithm in every sub-region. A cycle of the cooperation loop is completed by evolving the sub-regions based on the evaluation results of the fitted classifiers located in the corresponding sub-regions. The classifier system has been tested with real-field data acquired from the production line of a computer monitor manufacturer in Korea, showing superior performance to other methods such as k-nearest neighbors, decision trees, and neural networks.     

小结构大设计之育克

阐述了现代育克的分类和作用,从育克线位置、形状、省道处理、丝绺方向等方面详细说明现代育克结构设计的原理与方法,并就现代结构设计方法在育克中的应用提出观点.     

小型高精度轭铁冷挤压工艺的改进

轭铁是控制元器件中较关键的零件,具有精度高、加工困难,对工人的操作技能有较高的要求,零件合格率低等特点。采用冷挤压工艺取代传统的机械加工工艺,取得了较好的效果。     

丰满三期2号机转子磁轭装配新工艺

主要论述了具有圆盘式转子支架的转子磁轭工地施工新工艺,定位基准的确定,工艺参数的合理选择以及提高磁轭铁心质量的措施等。     

结构参数对筒形磁力联轴器磁转矩的影响

在假设磁转子的气隙远小于其轴向尺寸的情况下可忽略其边端效应,将磁力联轴器的磁场求解简化为二维平面磁场。借助ANSYS软件对磁力联轴器的磁场分布进行数值模拟,得到了不同磁转角下的磁力线分布和磁感应强度分布,并计算出对应的磁转矩,分析了内外磁体厚度、内外轭铁厚度、气隙及磁极数目对磁转矩的影响,以期对磁力联轴器的设计和应用提供有益参考。