This paper introduces the component and structure of the brake control system based on bogies.The control method,principle and function are also analyzed.The applications of the brake control system based on bogies are introduced.Based on the features of this system,using modular design to improving the maintainability of the system is proposed.

Based on fracture mechanics theory,Life Estimation System is done for high-speed train brake disc.A method of FAD which evaluating defect and lifespan of the brake disc with flaw assessment the fracture ratio() and load ratio() for high-speed train is put forward according to the theory of stress intensity factor.Using VB,flaw assessment system has been developed to evaluate defect and life span of the brake disc based on Paris formula.The design idea is based on function modular,and it has openness,and could be extended extension.The system has some functions including flaw assessment,proper evaluation and life estimation of the brake disc according to given data.It has very important engineering application value for improving safety and reliability of braking system of high-speed train.

Fatigue crack propagation rate of the forge steel brake disc is studed with a test in the paper.The fatigue crack propagation rate da/dN is determined with SE(B)test based on Paris,and the values of material parameter C、m are computed,which are the 4.94×10-15 and 3.5367 respectively.The fatigue crack propagation rate can be used to predict the forge steel brake disc residual life.

The service life of a brake disc depends on the temperature status during emergency braking.How to forecast the surface temperature and its distribution accurately becomes the key technology to study surface wearing,metallographic transformction and thermal cracking of the brake disc.A new method which translates the heat radiation coefficient into the film coefficient is put forward.The 3-D cyclic symmetric structure model,heat imported model and heat convection disperse model are established.Using the method of the average axle braking power,the temperature distribution of the brake disc of the high-speed train China Star was computed.The numerical simulation result shows the highest temperature will attain to 935℃ in emergency braking and the high temperature zone will concentrate in the middle of the friction area of the brake disc.The test of emergency braking was made on the 1∶1 test-bed,and the highest temperature of the brake disc was obtained.The convergence between the simulation results and the test data is sufficient to validate the mathematical model,which will offer a direct basis for the stress analysis and structure parameter optimization.

In order to study the 3D static performance of EP solenoid valves in the electro-pneumatic braking system of a passenger train, the 3D FEM model and mathematical model were established according to axisymmetric structural feature. The nonlinear of the electro-magnetic material and flux leakage were considered, and the differential scalar potential strategy (DSP strategy) was adopted in this paper. The simulation result shows that coil current, coil turn number, the lengths of work air gap and no-work air gap are key parameters affecting static behavior of EP solenoid valve. When rated current is 450 mA, and turn number is 3 200, and the lengths of work air gap and no-work air gap are 2 mm and 0.2 mm respectively, the actuator performance is optimal. In order to lessen the effect of the machining process, the coaxality between valve head and iron core and surface roughness of iron core should be controlled within level 8 and 0.8 m respectively. A prototype was made and tested, test data shows its properties meet design requirements.

铁道科学研究院机车车辆研究所根据城轨交通的特点开发研制了城轨列车制动系统,该系统采用微机控制模拟直通电空制动技术、高性能电子防滑系统等,能够满足城轨列车安全、可靠、快捷、平稳、舒适的要求.

The crack of the brake disc is investigated on China Star and Xian Feng.The feature of macro-profile is analyzed,and the crack initiation and extending mechanism of brake disc is discussed.The relation of law of the fatigue crack extending and feature of macro-profile is discovered,which provides a new method for the life estimation of the brake disc.

The function of EP solenoid valve in electro-pneumatic braking system for urban rail transit is set forth.The calculation models is set up according to coil turn characteristic,and transient temperature rising of EP solenoid valve has been simulation calculated.The result of simulation calculation accords with the test of resistance method,which meets the design request.The result has offered the theoretical basis for the design optimization of EP solenoid valve,which has a great application value and practical significance.As a key part in braking system for urban rail transit,the appraisal on the EP solenoid valve has been passed in Feb,2005.

问:我国发展200 km/h客运技术的必要性如何?国外200 km/h客运列车的技术模式与特点是什么?根据我国国情和国外经验采用哪种方式较合适?

对270km/h电动车组制动系统的关键部件,如微机控制直通电空制动、基础制动、防滑器及备用自动空气制动等的设计特点和性能作全面的分析和评估.

为满足我国270km/h高速列车制动技术条件,铁道科学研究院机车车辆研究所开发研制了新型高速列车制动系统.该系统主要特点体现在微机直通电空制动控制系统,大制动功率盘形基础制动以及高性能电子防滑器等,使高速列车在270km/h的运行状态下,实施空电联合制动时,实现了3100m距离内安全停车的要求.

结合270 km*h-1高速列车基础制动系统的研制现状,在大量试验和仿真计算的基础上,计算和分折盘形制动的受载机理、材料性能及盘形制动功率极限.通过比选分配复合制动和纯空气制动等不同工况的制动力,计算动力车和拖车的制动缸压力.通过计算分析得出,270 km*h-1高速列车采用动力制动和盘形制动时的制动距离为3 514.7 m,能够满足高速列车的制动初速为270 km*h-1时紧急制动距离小于3 700 m的要求.但是,经分析认为当运行速度超过250 km*h-1时,除采用动力制动和盘形制动外,还是应同时采用涡流制动、磁轨制动等多种制动方式,以减轻盘形制动的负荷,延长制动盘和闸片的使用寿命,降低运营成本.

Analyzing and estimating the design characteristics and performance to the key exective components of 270?km/h electric motor train unit,such as microprocessor controlled direct brake,foundation brake, anti skid equipment and supplementary automatic air brake etc.

Compositions and characteristics of the braking system for China Star EMU are presented. Then explained are thefunctions and principles of the key components like the micro-processor through electro-pneumatic braking, fundamental braking, anti-slideunit and stand-by automatic air braking unit. Test shows that the functions and operations meet the design requirements.