I. WRITING CONTENT REQUIREMENTS: AIM ANDSIGNIFICANCE (Including both of the domestic and international researchcondition)

1. AIMAND SIGNIFICANCE

   It’s anera of global trade, so the transportation of goods is very important.. According

   to thestatistics of the National Bureau of Statistics, the total volume of freighttransportation last year was 47.9 billion tons, an increase of 9.3% over theprevious year. Railway transportation is 3.69 billion tons, road transportationis 36.8 billion tons, water transportation is 6.66 billion tons, civil aviationis 70.58 billion tons and pipeline transportation is 790 million tons. From these data, it can be seen that roadtransportation is the main component except for fast shipping. Highwaytransport equipment is trucks. It is necessary to drive safely when usingtrucks, and to improve the efficiency of freight transportation as much aspossible. Automobile contains many systems, among which the braking systemdirectly affects the safety. When driving on the road, we are terrified of bigtrucks and want to avoid them as much as possible. Because in road accidents,accidents due to trucks are quite tragic. It is possible to attribute all theerrors to the driver, but many of them are not caused by the driver's fatigueor bad driving, but by the fact that there are many fatal shortcomings in thetruck. For example, the reasons of large volume and heavy weight lead to longbraking distance when braking. Not to mention when loading goods, some evenoverload, the greater the mass, the greater the inertia, even if emergencybraking, will be due to inertia and glide for a certain distance. Therefore, inorder to drive safely and reduce the traffic accident rate, it is veryimportant to research and design the braking system of freight cars. In orderto satisfy the safe driving and better braking performance of trucks, manyscholars at home and abroad have done a lot of research on the braking systemand the braking system of trucks, making great contributions.

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