火车的起源发展及现状--英文物理演讲ppt

1、TRAIN,水 133 梁迪 No.5,2014.4.30,The history of train,The principle of maglev trains,A suppose of future transportation,The history of trains,Fixed tractor 牵引机 + track 铁轨,A steam locomotive is a railway locomotive that produces its pulling power through a steam engine. These locomotives are fueled by b

2、urning combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine.,steam locomotive 蒸汽机车,The history of trains,Fixed tractor 牵引机 + track 铁轨,electric locomotive 电力机车,An electric locomotive is a locomotive powered by electricity from overhead lines, a

3、third rail or on-board energy storage such as a battery or fuel cell.,The history of trains,Fixed tractor 牵引机 + track 铁轨,diesel locomotive 内燃机车,A diesel locomotive is a type of railway locomotive in which the prime mover is a diesel engine. Several types of diesel locomotive have been developed, dif

4、fering mainly in the means by which mechanical power is conveyed to the driving wheels.,The history of trains,Fixed tractor 牵引机 + track 铁轨,Maglev 磁悬浮列车,Maglev is a method of propulsion that uses magnetic levitation to propel vehicles with magnets rather than with wheels, axles and bearings. With mag

5、lev, a vehicle is levitated a short distance away from a guide way using magnets to create both lift and thrust.,The history of train,The principle of maglev trains,A suppose of future transportation,Maglev,suspension system 悬浮系统,propulsion system 推进系统,guidance system 导向系统,Electrodynamic Suspension(

6、EDS) 电动悬浮,Electromagnetic suspension(EMS) 电磁悬浮,Both the guideway and the train exert a magnetic field, and the train is levitated by the repulsive and attractive force between these magnetic fields. In some configurations, the train can be levitated only by repulsive force.,Electrodynamic Suspension

7、 (EDS),The train levitates above a steel rail while electromagnets, attached to the train, are oriented toward the rail from below.,Electromagnetic suspension (EMS),Maglev,suspension system 悬浮系统,propulsion system 推进系统,guidance system 导向系统,Electrodynamic Suspension(EDS) 电动悬浮,Electromagnetic suspensio

8、n(EMS) 电磁悬浮,Some EMS systems can provide both levitation and propulsion using an onboard linear motor. EDS systems and some EMS systems can only levitate the train using the magnets on board, not propel it forward.,propulsion system 推进系统,Maglev,suspension system 悬浮系统,propulsion system 推进系统,guidance

9、system 导向系统,Electrodynamic Suspension(EDS) 电动悬浮,Electromagnetic suspension(EMS) 电磁悬浮,guidance system 导向系统,Some systems use Null Current systems, these use a coil which is wound so that it enters two opposing, alternating fields, so that the average flux in the loop is zero. When the vehicle is in th

10、e straight ahead position, no current flows, but if it moves off-line this creates a changing flux that generates a field that naturally pushes and pulls it back into line.,The history of train,The principle of maglev trains,A suppose of future transportation,At least 6 month ago, he came up with th

11、is idea,5 days ago, scientists in China accomplished HTS Maglev circular track test. 载人高温超导磁悬浮环形轨道测试,If there is no body on the train, the speed of the train can reach 2500km/h,资料来源,Backdrop picture is from Illustrations are from /wiki Written texts are from /wiki/Steam_locomotive /wiki/Electric_locomotive /wiki/Diesel_locomotive /wiki/Maglev Video is from News is from ,Review,The history of train,The principle of maglev trains,A suppose of future transportation,The history of train