高速接触网器材检验技术研究

介绍接触网器材抽样检验方案、检验项目、检验方法等,重点对接触线反复弯曲试验、绝缘子抗弯试验、接续类零件的短路热循环试验、铝合金零部件的腐蚀试验、终端锚固线夹试验等几个典型试验进行详细的研究与探讨,提出对检验结果的判断方法。     

一种新型牵引变压器的电气性能分析

分析YNvd变压器的接线特点,说明其对我国电气化铁道牵引供电系统具有良好的适应性。应用多绕组变压器理论,得到变压器一次侧与二次侧间电气量的变换关系,分析变压器的平衡特性。推导二次侧两相端口电压输出方程,给出相坐标下的节点导纳矩阵,计算三相侧短路阻抗。     

Performance analysis according to the combination of energy storage system for fuel cell hybrid vehicle

The need for the unmanned ground combat vehicle (UGCV), which is used for the surveillance, reconnaissance and targeting during extremely dangerous condition on the battlefield, has steadily increased, and the transition from manned ground combat vehicles to unmanned ground combat vehicles is expected to reduce the loss of lives during battle. The UGCV needs many types of capabilities to achieve satisfactory performance. This paper focuses on the modeling and control of the power system of the UGCV, and proposes the fuel cell hybrid system (FCHS) for the power system of the UGCV. The fuel cell hybrid system has many advantages in stealth drive and the system efficiency. In addition, the FCHS is much quieter than the engine generator and generates much less heat. The benefits of the FCHS are advantageous for use in Army operations, which require ‘silent watch’ capability and the ability to operate without showing up on an enemy’s radar screen. The FCHS has a fuel cell and uses an energy storage system (ESS) as a power source. The ESS (e.g., batteries or ultracapacitors) helps the fuel cell supply power to the electric drive system and also recovers energy during deceleration. The ESS makes it possible to improve the efficiency and dynamic characteristic of the power system. In this paper, the FCHS is composed of different combinations of component models. The component sizes are chosen to satisfy performance requirements. In order to determine the power distribution between the fuel cell and the ESS, a power management strategy based on the required power and the SOC (state of charge) of the ESS is proposed. Batteries and ultracapacitor, components of the ESS, have different characteristics. Accordingly, varying the combination of ESS components can change the performance of the power system. The performance of the FCHS with respect to different combinations of ESS is analyzed using simulated results.     

橡胶沥青应用技术探讨

橡胶沥青作为新型路面材料,可以改善道路使用功能,延长使用寿命,减轻废轮胎带来的环境压力,符合我国当前建设节约型社会和发展循环经济的政策。本文结合近年来橡胶沥青的生产和施工经验,从橡胶沥青的技术性能、试验检测和施工技术等方面进行了探讨和总结,为橡胶沥青的应用和推广提供技术支撑。     

微型汽车排气消声器的设计与优化

建立了某发动机工作过程模型和排气消声器性能评价模型,并进行了该排气消声器声学性能和空气动力性的仿真分析.采用仿真分析和试验验证相结合的方法,通过调节各腔室容积和隔板的穿孔率对该排气消声器进行了改进.改进后排气消声器的试验结果表明,消声器总体噪声值和阶次噪声值均有明显好转,高速噪声值比较高的状况得到改善,消声器性能基本达到设计要求.     

燃油2次喷射对柴油机性能的影响研究

研究了主喷射提前角和后喷射提前角对Ricardo Hydra单缸柴油机动力性能及排放性能的影响.结果表明.当该柴油机主喷射提前角为11°、后喷射提前角为3°时,柴油机最高爆发压力与采用单喷射时最高爆发压力相差不大,但平均有效压力却提高明显;随着喷油提前角的后移,烟度排放增加,NOx排放减少,HC排放增加.分析了主喷射和后喷射时该柴油机燃烧过程.     

现代双层有轨电车技术方案研究

双层有轨电车是路面轨道交通工具的重要型式之一.自有轨电车引入中国内地以来,近10年得到快速发展.但相比国外,双层有轨电车在中国内地的应用和适应性仍有较大发展和进步空间,有必要针对双层有轨电车开展进一步研究.介绍双层有轨电车国内外应用现状,详细叙述现代双层有轨电车技术平台、关键技术参数,分析适应性及应用前景.针对双层有轨...     

浅谈边宁荷夫沥青拌合站TBA240结构性能与特点

结合对TBA240沥青拌合站的使用,对其结构性能和特点进行了介绍.     

非接触式摩托车综合性能测试仪的计量鉴定

非接触式摩托车综合性能测试仪是用光电传感器得到的路面反射脉冲信号对应摩托车相对地面走过一段距离的原理来实现测量的,速度、距离是计量鉴定的关键参数。摩托车企业完全可以利用现有的摩托车底盘测功机等设备实现自校,解决非接触式摩托车综合性能测试仪这一关键计量器具送检难问题。     

KZ1型转向架制动梁滑块磨耗套注塑成型工艺研究

以出口铁路货车KZ1型转向架制动梁滑块磨耗套产品为对象,从产品结构分析、模具设计、注塑机选型、工艺参数确定等方面开展工艺研究.模具型腔采用1模1腔、冷流道、2板模设计,模具四角以圆导柱为动定模导向机构.浇注系统采用盘形浇口进胶方式,以减少熔接痕数量;在分型面上开设排气槽,所有排气槽均与模具外侧联通,以实现良好排气;在产...