车钩连挂机构状态探测方式探讨

介绍了车钩连挂机构状态探测的作用和方式,对几种探测方式的精确性、结构性、可靠性和影响性进行了分析,并提出应根据不同车钩类型选择组合探测方式的建议.     

Improvements for the stability of heavy-haul couplers with arc surface contact

To investigate the stability mechanism of heavy-haul couplers with arc surface contact, the geometry and force analysis were conducted according to the friction circle theory. To improve the stability of the coupler, four improvements were proposed, which are increasing the secondary lateral stiffness of locomotives, adding a restoring bumpstop at the end of the coupler, increasing the arc surfaces radii and changing the clearance and stiffness of secondary lateral stopping block. A multi-body dynamics model with four heavy-haul locomotives and three detailed couplers were established to simulate the emergency braking. In addition, the coupler yaw instability was tested to investigate the effects of relevant parameters on the coupler stability. The results show that increasing the secondary lateral stiffness of locomotives, adding a bumpstop with a smaller bumpstop gap, increasing the arc surfaces radii, increasing the stiffness and decreasing the clearance of secondary lateral stopping block are conducive to improving the stability of the coupler with arc surface contact.     

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.     

符合欧盟铁路TSI的自动连挂系统设计

基于欧盟铁路互联互通技术要求,文章对车辆自动连挂系统开展了设计及验证工作,结果表明所设计的连挂系统符合互联互通技术规范(TSI)的要求,具备进入欧盟铁路系统的前提条件.     

大功率重载机车变形吸能元件早期失效分析与优化

文章简要介绍了变形吸能元件的组成、结构及工作原理,描述了大功率重载机车变形吸能元件的早期失效现象,从设计结构、试验工艺、理化参数、金相检查等方面详细阐述和分析了失效原因,并提出设计及工艺优化方案,最后通过对比分析和疲劳寿命试验验证了优化方案的改善效果,优化后的产品可满足机车车辆运行使用要求.     

车钩三态作用仿真及防跳性分析

由于车钩运行中会产生磨损以及零件间存在的配合间隙,导致车钩三态作用以及防跳功能失效．通过对17型车钩的三态作用分析,从设计原理出发研究防跳机理,分析了防跳失效的原因．在Pro／Engi—neer环境下提出了基于碰撞的运动仿真方法,并结合结构分析和虚拟装配,实现了车钩三态作用的仿真以及防跳性分析．通过控制零件间的合理间隙量保证车钩性能及防跳可靠性,从而切实保障重载货车安全运行．     

基于纵向压力的2B_0重载机车动力学特性

为了解决2B0重载机车牵引试验中出现的3次扩轨掉道事故,分析了纵向压力作用下机车车钩倾斜与稳定原理,推导了车钩自由角的计算原理.根据车钩的试验数据,建立了车钩动力学模型.计算结果表明:大纵向冲动下车钩严重偏转是导致事故发生的主要原因;为了保证车辆安全运行,大摆角车钩必须具有对中复位功能;车钩自动复位能力、钩缓装置的特性对于机车车辆轮对侧磨有显著影响.     

基于SIW宽边耦合定向耦合器的多路功率分配网络

现代无线通信技术的发展,对射频微波电路的研究与应用提出了平面化、小型化和集成化的要求。衬底集成波导（SIW）是近几年来出现的一种新型平面传输线,它兼有传统矩形波导（RW）和平面微带结构的双重特点,具有较好的实用价值,其理论研究和工程应用受到广泛关注。文章利用这种新型结构,开展了微波平面多路功率分配网络的工程研究,设计了低剖面紧凑型三路功率分配网络。     

从控机车滞后时间对3万t列车纵向力的影响

使用列车空气制动仿真方法获得空气制动系统特性,通过列车动力学仿真方法分析了3万t列车在多机车不同步条件下紧急制动和常用制动时车钩力,提出了大秦线3万t重载组合列车的可行性编组.分析了从控机车在各种滞后时间情况下,列车常用和紧急制动的最大车钩力的变化特点.研究结果表明:平道常用全制动工况下,从控二机车滞后时间比从控一机车...     

基于海水环境下ICPT系统电磁耦合器的研究

感应耦合电能传输技术(ICPT)是近来兴起的一种新型电能传输模式。针对深海环境下海流扰动影响ICPT系统传输性能稳定的问题,利用ANSYS有限元仿真软件分析电磁耦合器不同间隙下耦合系数和电感参数随磁芯偏心量的变化趋势。建立含有补偿电容的互感等效电路,计算分析系统谐振情况下系统功率和传输效率的影响因素,仿真研究系统功率和传输效率随输入电压、负载电阻、频率和线圈匝数的变化规律,为提高海水环境下ICPT输系统的优化设计提供参考。