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等效(二次等效换算)法对于多种材质闸瓦(片)并用的列车制动力计算甚为适用,但是很多闸瓦的等效系数受到制动初速度的影响,所以按列车最高速度的3个级别,分别对应选择各种闸瓦(片)的等效系数以及确定相关的机车车辆每台(辆)的等效闸瓦力符合列车运用状况,更接近实际。这3个速度级别是对应(1)160 km/h快速客车(含快速客运机车、快速动车组及快速行邮车);(2)120 km/h普通客车(含普通客运机车、普通行邮车和行包车以及快运货运机车和快运货车);(3)100 km/h普通货车(含普通货运机车)。此外,还核定按湿轨黏着条件限制的机车车辆不同闸瓦(片)的比换算闸瓦力以供铁道机车车辆制动设计及运用参考。
Equivalent (secondary equivalent conversion) method for a variety of brake shoe (film) and the use of train braking force calculation is very applicable, but many of the brake shoe equivalent coefficient by the initial braking speed, so by train maximum speed , Respectively. The equivalent coefficients for selecting various brake shoes (pieces) and the equivalent brake force for each locomotive (vehicle) corresponding to the corresponding train operating conditions are closer to the actual conditions. These 3 speed levels correspond to (1) 160 km / h express passenger car (including fast passenger locomotive, fast EMU and express mail); (2) 120 km / h ordinary passenger car (including ordinary passenger locomotive, Car and charter and express freight and express freight); (3) 100 km / h general cargo wagons (including general freight locomotives). In addition, it is also approved that the ratio of brake force of different brake shoes (pieces) of locomotives and rolling stock limited by wet rail adhesion conditions should be used as reference for brake design and application of railway locomotives and vehicles.