高速动车组轴承轴颈智能选配

针对列车轮对检修后,轴颈和轴承不能达到最大量选配及选配组合不佳的情况,通过研究轮对检修技术、轴颈轴承选配原则、轴颈轴承标准,建立数学模型,设计一套轴承轴颈智能选配方法,并得到了较好的理论结果。     

SDD17型机车轮对滚抱轴承温度异常分析

分析了引起SDD17型机车滚抱结构轮对滚抱轴承温度异常的原因,并介绍了现场处理过程及处理方法.     

09-3X捣固装置振动轴轴承故障分析

结合09-3X捣固装置振动轴轴承的2起故障,通过对振动轴总成的结构及其作业、维修等特点进行分析,探讨故障产生的的原因,提出防范措施,以期减少或避免类似故障的发生。     

IGBT逆变器供电的电力机车转向架轴承失效分析

对由IGBT变流元件构成的交流传动逆变器供电的电力机车转向架的驱动装置轴承和轴箱轴承的电流通路进行探索、分析,特别对Electric Discharge Machining(EDM)电流进行了分析,提出了判断轴承电蚀失效的依据及相应的解决措施。     

HX_D3型机车牵引电机故障的预防探讨

通过对HXD3机车牵引电机窜轴、轴承固着等故障的分析研究以及机车电机与齿轮箱结构、电路控制等的分析,提出如何在大整备格局的生产布局下提前发现和预防该故障的机理、思想和方法,最大程度地降低其对生产运输的影响。     

汽车空调维护要点

汽车空调系统一般应注意以下维护要点：压缩机：压缩机的安装支架不得松动。传动皮带松紧度要适宜，过松会引起打滑，造成压缩机转速下降，制冷量不足；过紧又加剧皮带磨损以及造成曲轴轴承过早损伤。压缩机冷冻机油油面高度应在规定范围内，在正静情况下冷冻机油消耗量极少，如果从压缩机的视油镜片中看不到冷冻机油，则说明冷气系统中存在泄漏现象，应及时维修。     

船用柴油机增压系统常见故障分析

分析了船用柴油机增压系统的常见故障及原因,并提出了相应的解决办法。     

THE EDDY LOSSES OF A MAGNETIC THRUST BEARING

Accurate calculations of losses associated with the operation of magnetic bearings are particularly important for high speed applications where the rotor losses are expected to be large and for some particular applications where even low power losses will be critical. Power losses in the magnetic thrust bearing is often neglected, but if there is misaligned in the rotor and bearing, the magnetic field in the thrust bearing is no longer axisymmetric one, or the dynamic control current in the winding is time dependent one, eddy currents are caused to flow inside the conducting material, then the power losses are very important for magnetic bearing design. This paper presents an analytical model of a thrust magnetic bearing, and the magnetic fields, forces and losses of thrust magnetic bearing are calculated. In the calculations the frequency of dynamic control current is up to 1 000 Hz, rotating speed is from 60 rpm to 1 200 rpm, and the non-linearity of material is also taken into consideration. The results shows that if the magnetic field is not saturation, the eddy losses is proportional to dynamic control current frequency and a square function of dynamic control current, and also 5/2 power function of shafts speed.