基于ANSYS的EP电磁阀静态性能仿真分析

针对EP阀轴对称的结构特点,建立有限元分析模型。考虑电磁材料非线性及漏磁因素的影响,采用微分标量势法(DSP)对旅客列车电空制动系统中EP电磁阀三维静态性能进行仿真分析。结果表明,电磁阀的安匝数、工作气隙、非工作气隙等设计参数是影响电磁阀性能的主要参数。额定电流为450 mA、线圈匝数为3 200、工作气隙和非工作气隙分别为2 mm和0.2 mm时,EP阀各项性能最优。为了减小加工工艺对EP阀工作性能的影响,磁铁和阀罩的同轴度应控制在8级,铁芯外径表面粗糙度应抛光至0.8μm。试验表明按照仿真方法设计的EP阀,其各项性能指标均达到了设计要求。     

内燃机车制动系统的现状及发展趋势的探讨

主要介绍内燃机车制动系统的现状、技术特点以及其发展趋势。     

Analysis of the car body stability performance after coupler jack-knifing during braking

This paper aims to improve car body stability performance by optimising locomotive parameters when coupler jack-knifing occurs during braking. In order to prevent car body instability behaviour caused by coupler jack-knifing, a multi-locomotive simulation model and a series of field braking tests are developed to analyse the influence of the secondary suspension and the secondary lateral stopper on the car body stability performance during braking. According to simulation and test results, increasing secondary lateral stiffness contributes to limit car body yaw angle during braking. However, it seriously affects the dynamic performance of the locomotive. For the secondary lateral stopper, its lateral stiffness and free clearance have a significant influence on improving the car body stability capacity, and have less effect on the dynamic performance of the locomotive. An optimised measure was proposed and adopted on the test locomotive. For the optimised locomotive, the lateral stiffness of secondary lateral stopper is increased to 7875?kN/m, while its free clearance is decreased to 10?mm. The optimised locomotive has excellent dynamic and safety performance. Comparing with the original locomotive, the maximum car body yaw angle and coupler rotation angle of the optimised locomotive were reduced by 59.25% and 53.19%, respectively, according to the practical application. The maximum derailment coefficient was 0.32, and the maximum wheelset lateral force was 39.5?kN. Hence, reasonable parameters of secondary lateral stopper can improve the car body stability capacity and the running safety of the heavy haul locomotive.     

深圳地铁2号线制动电阻设置浅析

结合深圳地铁2号线工程实践,从车辆、环控、变电所、土建等方面,分别对车载设置方案、地下变电所设置方案、地面变电所设置方案进行了较为详细的分析比较,得出推荐方案.为当前及今后地铁工程中制动电阻设置提供了参考和借鉴.     

The public's understanding of the functionality and limitations of automatic braking in Japan

Automated driving systems are increasingly widespread in the automotive industry. To operate automobiles that are assisted by such systems, drivers must correctly understand their functionality and limitations. Hence, focusing on the rapidly spreading technology of automated braking, this study seeks to clarify the general public's understanding of automatic braking systems. A total of 210 Japanese people responded to a questionnaire regarding how automatic brakes are operated, how they work, when they disengage, and so on. The proportion of those who misunderstood the operation of the system is not especially high, but there were a certain percentage of people who had misconceptions; e.g., some believed that automatic braking could detect pedestrians or bicycles. Moreover, respondents were under the impression that drivers cannot readily disengage automatic braking systems. If they mistakenly use the automatic brake, there is a possibility of posing a risk to the road transportation system.     

编组站调机自动化车列性能测算算法研究

按照当前调机控车走行存在的ATO模式(自动停车模式)、ATP模式(安全停车模式)给出确保安全停车的前提下,车列达到最佳制动的条件。通过算法研究,给出以下两类问题的解算方案:根据已知列车制动能力(换算制动率)和制动距离计算车列当前运行速度(ATO模式);根据已知列车制动能力(换算制动率)和必须保证的车列安全停车的制动距离,解算平道或下坡道允许的紧急制动限速(ATP模式)。并给出缺少部分输入条件时保证计算数据安全、可用的解决方案。     

列车防滑控制与不利黏着时制动力计算

分析了影响黏着的基本因素和国内外关于黏着系数的规定,介绍了防滑控制的方法,并结合列车运行的实际情况及试验经验,提出了轮轨间不利黏着状态下的制动力计算方法。     

日本电力制动的技术动向

介绍了电力制动的类型,分别从电力机车、既有线电动车及新干线电动车使用的电力制动,阐述了该制动技术的应用现状及发展趋势。     

螺旋传动手制动装置设计研究

介绍了出口伊朗客车的手制动系统,重点阐述了手制动系统中符合UIC标准的螺旋传动手制动装置的原理、功能、结构、设计计算方法、安装方式和试验。     

地铁列车再生制动节能仿真研究

地铁列车发展初期，列车制动时仅选用车栽电阻制动加机械制动，但是这样造成了环境温度的升高，不利于能源的充分利用，不能达到较好的节能效果。通过软件仿真数据，在不同运行图下，分析了列车采用电阻制动和再生制动方式下能量节省的变化，从而选择更为经济的方案。