特高压输电铁塔曲臂横担吊装方法探讨

为解决1 000 kV特高压酒杯型铁塔曲臂外横担吊装的难题,以浙江至福州特高压交流输电工程酒杯塔曲臂外侧横担吊装为主要研究对象,针对其横担长、重量大、边横担距塔中心远的特点,采用强度高、稳定性好的高强钢,创新设计高强辅助臂架,利用高强辅助臂架进行整体吊装曲臂外侧横担,详细分析了吊装施工方法。     

改进高速细纱长机 优选器材专件

针对印度市场对高速细纱长机的需求，介绍了山西鸿基实业有限公司通过改进长机结构，提高稳定性和装配精度，研发高速节能锭子，优选器材专件，采用进口钢丝圈和我国台湾三明精机联合制造自动落纱机，开发出1008锭高速细纱长机出口印度，516锭高速短机出口巴基斯坦、越南和莱索托等国；指出国产环锭细纱机将会走高速度、小卷装、长车型细络联的发展模式。     

构架三种常用疲劳强度校核方法对比研究

对比分析转向架构架三种常用疲劳强度校核方法的差异。分别采用铁路标准中规定的载荷谱、多刚体系统动力学仿真(Multiple rigid body system dynamic simulation,MRBSDS)技术获取的载荷谱和线路动应力测试应力谱等三种方法对某型地铁拖车转向架构架进行疲劳强度校核。通过准静态叠加法将载荷谱转换为应力谱,准静态叠加法中给出应力响应因子(Stress response factor,SRF)的定义,方便载荷谱和应力谱之间的转换。对比方法是将三种方法获取的应力谱线性外推至100万km进行疲劳等效应力计算。计算结果表明,与线路试验相比,利用标准中规定的载荷谱进行疲劳强度校核略偏保守,MRBSDS方法获取的载荷谱无法准确预测疲劳寿命。应力谱频域分析发现,MRBSDS方法计算疲劳载荷谱应朝采用真实且含有高频信号的线路谱和刚柔耦合模型方向发展。     

Sensorless Vector Control of Five-phase Induction Motor under Open-phases Fault

Abstract—This article deals with proposed solutions for five-phase induction motor drives, specifically aimed to sensorless vector control under an open-phases fault. Exploiting the modified transformation matrices for dual planes, the motor model in the synchronous frame is established under open phases. Torque ripple is reduced by particular magnitude ratio currents. Furthermore, the third harmonic current is used to improve iron utilization and torque density. The proposed sliding-mode observer method for wide-range speed estimation combined with online resistance identification is investigated, especially for low-speed operation. Experimental tests are performed to validate the effectiveness of the proposed method.     

基于PLC的提升机制动系统监控设计

根据提升机现场运行的需要,设计了以PLC为下位机控制核心,WINCC作为上位机控制核心的提升机制动装置监控系统。实现了对提升机制动系统的闸瓦间隙值、制动油压值等参数的实时监测,显示和故障报警,以及数据存储,报表打印和查询等功能,有效提高了提升机制动系统的安全性和可靠性。     

高速动车转向架构架静强度试验和仿真研究

高速动车组转向架构架是保证高速列车安全运行的重要部件。针对某高速动车组转向架构架,通过采用科学合理的静强度试验方法和设备,对构架的静强度进行评估,同时与理论计算结果相互验证其准确性,以检验构架是否满足强度要求,为列车的安全运行提供保证。     

基于UG的商务车车架分析

车架作为汽车车身的重要组成部分,是汽车的主要承载部件,车辆所受到的各种载荷最终传递到车架,车架设计的好坏直接影响车辆的安全性能。主要通过对某车架在不同工况下的静力分析及在无约束情况下进行模态分析检验是否符合设计要求,基于三维软件建立车架模型,对某车架的结构和受力情况进行分析,通过用专业划分简化模型软件对模型进行简化,去除多余模型。最后用UG软件对车架进行静力分析和模态分析,通过应力分析结果得出车架的最大应力、变形量的分布及模态频率,以确定车架的安全性。     

大型往复压缩机6M80（50）机身曲轴加工

现代往复压缩机的以大容量、高压力、结构紧凑、低能耗、低噪声、高效率的方向发展,大型往复压缩机更是压缩机行业重点发展的关键产品,也是大型石化项目的关键设备.为了满足市场大处理量流程的需要,大型往复压缩机的开发势在必行.6M80-650.46/7-81.68/6-26-BX型联合气压缩机正是在这样的背景下研制的,本文介绍了大型往复压缩机6M80 （50）基础件机身、曲轴的结构特点及切削加工特点,分析了机身、曲轴加工的工艺方案.     

国际标准化组织动植物油脂国际标准制定（网络首发、推荐阅读）

Increasing volumes of oils and fats are produced annually with a large section that are traded internationally. The International Organization for Standardization(ISO) body develops international standards covering almost all aspects of technology and manufacturing with 23,882 standards currently published. Standards in the animal and vegetable fats and oils sector is developed by Technical Committee ISO/TC 34, Food products, Subcommittee SC 11, Animal and vegetable fats and oils. Standards are developed through consensus by national members that represent ISO in their country. Each Standard is developed within a determined timeframe and goes through various pre-determined stages such as project proposal, development, national voting and commenting on the draft Standard to final publication. ISO TC34/SC11 Standards range from sampling of oils and fats, sample preparation to analysis of its composition, the minor components, and quality and identity parameters as well as contaminants. The analysis results are used by industry for product development, labelling, research and to provide peace of mind for consumers on its safety. An important future trend is the focus on the safety concerns from either environmental contamination(e.g. mineral oils) or processing contaminants such as esters of 3-MCPDs(3-monochloropropane-1,2-diol or 3-chloropropane-1,2-diol).     

周期载荷激励下某型柱塞泵机体计算

将某型柱塞泵机体作为线性结构,计算出柱塞在周期激励作用下,柱塞泵机体的位移和应力随频率的响应关系,并给出了具有代表性的两点动态响应曲线;根据该理论分析,找到了柱塞泵机体在周期激励作用下的最佳工作频段,可以有效避免结构发生振动耦合及由其他受迫振动产生的有害影响。