动车转向架电机吊座强度设计载荷的探讨

以电机吊座强度设计载荷为探讨对象,对比了国内外相关标准,结合试验结果,提出了适合我国线路的设计载荷取值。     

电流测定信号的过采样与电动机电流测定(一)

介绍电流测定信号的过采样的几种方法,例如十进制滤波器等.同时阐述了电动机电流测定的常用方法,如瞬时值的测定,积分测定等.     

电机振动特性测试安装条件研究

电机振动特性测试试验中对设备的安装条件有严格要求。本文对相关要求进行了理论分析和试验验证，提出以设备的最低固有频率的隔振效果判断安装条件是否合格的方法，这种方法有一定的参考意义。     

大功率交流传动内燃机车发展现状及对开发200km/h客运机车技术问题的探讨

介绍了国内外交流传动内燃机车发展的概况,结合国内出现的开发200km/h大功率客运内燃机车的要求,针对其中的一些技术问题进行了探讨,并提出了建议.     

三相异步电动机起动失败的原因分析与对策

详细分析了电动机初次运行时常出现的瞬动跳闸、降压起动跳闸、短延时跳闸和长延时跳闸等起动故障的现象和原因,提出相应的解决办法.     

机车侧梁牵引座结构优化设计

对SS系列电力机车车体侧梁牵引座进行了比较及强度计算,分析了侧梁牵引座的结构特性,提出了不同的优化结构方案;分析比较各种方案的优缺点并根据其载荷特性进行疲劳强度评价,从设计上保证侧梁牵引座结构的免维护性,从而达到侧梁牵引座结构优化的目的。     

A bi-objective maintenance scheduling for power feeding substations in electrified railways

Railway infrastructure is characterized by intensive capital investment, long lifecycle and low return. It is crucial to attain a reasonable system reliability while keeping the recurrent cost manageable throughout the asset lifecycle. Power feeding substations are the key assets on electrified rail lines. As they are subject to various adverse operating conditions, maintenance works of different levels are scheduled to ensure reliability and extend the asset life time if possible. Maintenance scheduling is often regarded as a trade-off between reliability and cost. This study incorporates considerations of different levels of maintenance activities to balance between reliability and cost. In establishing the system reliability model, the contribution of individual component reliability toward the overall system reliability is extracted from the functional relationship among the components. Solution methodologies to this scheduling problem are also proposed here. Evaluation of the scheduling model and the proposed solution is discussed and analyzed through simulation. To cater for the operating conditions in different systems, the impact of weighting factors between reliability and cost on the variations of resulting schedules will be investigated.     

基于BP神经网络的煤矿电机故障诊断预测

电机软故障辨识诊断一直是困扰电机维修工程师一大难题。引入BP神经网络概念,利用采集到的样本数据训练BP神经网络,得出最优网络模型。通过典型故障状态参数测试新方法的辨别能力。结合对煤矿电机参数的训练测试,通过仿真实验验证了这种新方法对电气故障诊断的有效性。     

潜艇推进电机技术特点与发展分析

分析归纳潜艇推进电机的性能需求特点,主要介绍现代直流电机、先进感应电机、永磁电机、高温超导电机等几类主要电机的技术发展现状,在比较几种推进电机技术特点的基础上,结合潜艇推进的关键需求,分析总结了未来潜艇推进电机的发展趋势。     

CRH3型动车组设备舱温度分布和变化规律

为确定动车组设备舱通风散热性能,对列车在环境温度为35~-25℃下运行时,设备舱内空气流动以及传热进行仿真分析,获得牵引变流器表面温度随不同环境温度的变化规律,这为车下设备的合理布局和设计提供依据.