火車的起源發(fā)展及現(xiàn)狀 英文物理演講ppt課件.ppt

1、TRAIN,水 133 梁迪 No.5,2014.4.30,1,The history of train,The principle of maglev trains,A suppose of future transportation,2,The history of trains,Fixed tractor 牽引機 + track 鐵軌,3,A steam locomotive is a railway locomotive that produces its pulling power through a steam engine. These locomotives are fuele

2、d by burning combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine.,steam locomotive 蒸汽機車,4,5,The history of trains,Fixed tractor 牽引機 + track 鐵軌,6,electric locomotive 電力機車,An electric locomotive is a locomotive powered by electricity from overhe

3、ad lines, a third rail or on-board energy storage such as a battery or fuel cell.,7,The history of trains,Fixed tractor 牽引機 + track 鐵軌,8,diesel locomotive 內燃機車,A diesel locomotive is a type of railway locomotive in which the prime mover is a diesel engine. Several types of diesel locomotive have bee

4、n developed, differing mainly in the means by which mechanical power is conveyed to the driving wheels.,9,The history of trains,Fixed tractor 牽引機 + track 鐵軌,10,Maglev 磁懸浮列車,Maglev is a method of propulsion that uses magnetic levitation to propel vehicles with magnets rather than with wheels, axles a

5、nd bearings. With maglev, a vehicle is levitated a short distance away from a guide way using magnets to create both lift and thrust.,11,The history of train,The principle of maglev trains,A suppose of future transportation,12,Maglev,suspension system 懸浮系統(tǒng),propulsion system 推進系統(tǒng),guidance system 導向系統(tǒng)

6、,Electrodynamic Suspension(EDS) 電動懸浮,Electromagnetic suspension(EMS) 電磁懸浮,13,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 fo

7、rce.,Electrodynamic Suspension (EDS),14,15,The train levitates above a steel rail while electromagnets, attached to the train, are oriented toward the rail from below.,Electromagnetic suspension (EMS),16,Maglev,suspension system 懸浮系統(tǒng),propulsion system 推進系統(tǒng),guidance system 導向系統(tǒng),Electrodynamic Suspens

8、ion(EDS) 電動懸浮,Electromagnetic suspension(EMS) 電磁懸浮,17,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 推進系統(tǒng),18,Maglev,suspension

9、 system 懸浮系統(tǒng),propulsion system 推進系統(tǒng),guidance system 導向系統(tǒng),Electrodynamic Suspension(EDS) 電動懸浮,Electromagnetic suspension(EMS) 電磁懸浮,19,guidance system 導向系統(tǒng),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 flu

10、x in the loop is zero. When the vehicle is in the 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.,20,21,The history of train,The principle of maglev trains,A suppose of future t

11、ransportation,22,At least 6 month ago, he came up with this idea,23,24,5 days ago, scientists in China accomplished HTS Maglev circular track test. 載人高溫超導磁懸浮環(huán)形軌道測試,If there is no body on the train, the speed of the train can reach 2500km/h,25,資料來源,Backdrop picture is from Illustrations are from http

12、://wiki Written texts are from /wiki/Steam_locomotive /wiki/Electric_locomotive /wiki/Diesel_locomotive /wiki/Maglev Video is from News is from ,26,Review,27,The history of train,The principle of maglev trains,A suppose of future transportation,28,The history of trains,Fixed