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1、动力集中与动力分散动车组特点比较（伊朗项目材料）Comparison between EMUs with Centralized and Distributed Power目前，高速动车组按牵引动力和驱动设备的配置方型分类有两种：动力分散型和动力集中型。At present, the high-speed EMUs can be divided as per power configuration into two categories - power-distributed EMU and power-centralized EMU.动力集中型动车组是将大部分机械和电气设备集中安装在位于列车
2、两端的动力车即机车上，机车的动力转向架上装有牵引电机，驱动轮对牵引列车运行。中间客车没有动力，由机车牵引。机车不载客，客车载客。编组一般为机车+拖车形型，示意图如下：As for power-centralized EMU, most of its mechanical and electrical equipment are mounted in the motor cars, i.e. locomotives, at the two ends, and the bogies of the locomotives are equipped with traction motors which
3、 drive the train from wheelsets. The intermediate cars are not motored, but hauled by locomotives. The locomotives do not carry any passengers but the intermediate cars do. The composition of such EMU generally adopts the mode of locomotive+trailer, as shown below:机车 拖车1 拖车2 拖车3 拖车4 拖车5Loco. Trailer
4、 1 Trailer 2 Trailer 3 Trailer 4 Trailer 5注： 表示动力轴，表示非动力轴，下同。Note: stands for motor axle and for trailer axle, same below.动力分散型动车组是指将大部分机械和电气设备吊挂安装在车辆地板下面，牵引电机安装在列车的全部或部分转向架上，使全部或部分轮对成为列车的驱动源，列车的全部车厢都可载客。As for power-distributed EMU, most of its mechanical and electrical equipment are mounted below
5、the deck and the traction motors mounted on all or parts of the bogies making all or part of the wheelsets the driving source, and all the cars are able to carry passengers. 全部为动力车All motor cars 部分为动力车Partly motor cars动力集中和动力分散动车组特点比较Comparison between Features of EMUs with Centralized and Distribut
6、ed Power序号S/N内容Contents动力分散动车组Power-Distributed EMU动力集中动车组Power-Centralized EMU1编组Composition通常为固定编组，不可随意增减车辆数量，但可以采取2列联挂方型，动车与拖车同步增加或减少，不会造成过载或欠载。Composition usually fixed and increase or decrease of cars not permissible, yet pair operation function available, which maintains the portion between mo
7、tor and trailer cars and thus avoid under load or over load.可任意加减拖车的数量，编组灵活。加减车厢后牵引力不变（因为动车数量不变），但阻力变化，易造成过载从而达不到原定速度，或欠载造成功率浪费。Flexible composition, increase or decrease of cars not permissible. Traction force not changed after increase or decrease of cars (number of motor cars unchanged) yet the r
8、esistance does, which easily leads to unsatisfied speed due to over load or power waste due to under load.2动力配置Power configuration列车的牵引动力可以分散设置，按需要增减动轴，使列车总功率不受机车功率所限制。Traction power source can be distributed and increase or decrease of motor axles as per demands possible, i.e. total power of EMU no
9、t restrained by that of locomotives.总功率受机车功率限制Total power of train restrained by that of locomotives3换向行驶Bidirectional operation在两端都有驾驶室，可双向行驶，省却调车的时间，同时减少车务人员的工作及提高安全。Cab available at both ends and bidirectional operation can be realized, which reduces time for shunting, releasing working load and
10、improving safety of service personnel.列车换向时需先把机车在一端脱钩后再移到另一端挂钩，折返时间长。Locomotive needs to be decoupled from one end and coupled to another end for bidirectional operation, which takes a longer time for locomotive to reverse.4轴重Axle load最大轴重轻，对轨道冲击小。高速情况下最大轴重对轨道的破坏作用远远大于平均轴重，这也是为什么越是高速的列车越趋向于使用分散技术的原因
11、Lower max. axle load and thus less impact to tracks. The destructive efforts of max. load under high speed is much higher than that of average axle load, that is why more and more high-speed EMUs tend to adopt distributed power.机车最大轴重大，高速运行下对轨道冲击大。Max. axle load contributed by locomotive, imposing l
12、arger impact to tracks under high speed.5载客量Passenger capacity载客量较同等长度的动力集中型动车组高约20%，可充分利用站台长度。Passenger capacity 20% higher than power-centralized EMU of same length and utilization of platform length more adequate.机车不能载客。Locomotive cannot carry passengers.6启动加速度Starting acceleration启动加速度高，列车加速时间短，
13、更适合发车密度大、站间距短的路线。Higher starting acceleration and thus less accelerating time, suitable for lines with short headway and inter-station distance.启动加速度小，列车加速时间长，不适合发车密度大、站间距短的线路。Lower starting acceleration and thus more accelerating time, not suitable for lines with short headway and inter-station dis
14、tance.7轮轨粘着Wheel-rail adhesion整体粘着性好，在加速时不易产生空转（车轮的牵引力大于轮轨间的粘着力，造成轮速异常上升），加速更稳定。Better comprehensive adhesion and less possibility of slide (traction force of wheel larger than wheel-rail adhesion force, thus leads to abnormal increase of wheel speed) during acceleration, thus more stable accelerati
15、on.集中动力车单轴粘着性能好于分散动力车，但由于动轴数量少，总的粘着性不如分散动力车，加速时易产生空转。Adhesion of individual axle better than that of power-distributed EMU, however, comprehensive adhesion poor due to less number of motor axle, higher possibility of slide during acceleration.8再生制动Regenerative brake列车从高速减速到40km/h（不同的列车可能不同）的过程几乎不需要使用用空气制动，速度再降低空气制动开始补充，充分利用再生制动，将制动能量转换为电能反馈回电网,减少制动盘机械磨耗和能源浪费。Pneumatic brake almost unnecessary when braking from high speed to 40km/h (may be different for different trains) and only applied if speed is to be further lowered. Regenerative brake fully utilized,
