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Research on Design of Portal Independently Rotating Single_Axle Radical Driving Bogie

Author: QuWenQiang
Tutor: WangBoMing
School: Southwest Jiaotong University
Course: Vehicle Engineering
Keywords: Portal radical driving bogie Independently Rotating wheel Single_axle truck Structure scheme design Dynamic analysis
CLC: U270.33
Type: Master's thesis
Year: 2010
Downloads: 109
Quote: 1
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Abstract

The urban mass transit system has many characteristics such as high efficiency of transportation, high-speed, punctuality, economizing energy and space, high security and protecting environment, so it has gained favor of many cities of the world. To solve the traffic problems in developing cities, the basic way is to establish a modern integrated traffic system based on the railway trasit such as metro, light railway, monorail transit etc.As the direct transport tools in the urban mass transit system, vehicles have to fit into the environment of each city. And the bogie is one of the major components of a vehicle, it transfer every kind of forces, and produce tractive force using adhesion force between wheel and rail. The performance criteria of a bogie determine directly the tractive effort, running quality, wheel-rail wear indices and security of the train.The portal radical driving bogie is composed of special wheelsets, frame, driving mechanism, basic brake rigging and suspension components. The major difference between portal radical driving bogie and general two-axles bogie is that portal radical driving bogie has only two wheelsets, and regulate the shake angle of the approaching wheelsets,through a series of levers under the car floor.This thesis is to introduce the development and status of single-axle bogie at first, then design a scheme of portal radical driving bogie, using modern technology of urban mass traffic and high-speed motor train unit. After analyzing the car’s stability in straight line and curve pass line conditions, we have primarily found out the designing rules of radical regulate components,and got its reasonable designing parameters.Via theories of rail vehicle dynamics, we build a mathematical model of portal radical driving bogie, and build a train unit model in the SIMPACK software, then execute dynamic calculating, get reasonable suspension parameters and parameters of radical regulate component. With the parameters, we have predicted the dynamic performance of train unit, and come to the conclusions following:1 Eliminate the hunting movment and the car doesn’t has the hunting movment critical velocity.Common bogie has couple movments of lateral movment and shaking inevitably of wheelsets, called hunting movment.But the left and right wheels of the independently rotating truck are not in couple,so it can fundamentally eliminate the hunting movment and get highly critical speed2 The portal radical driving bogie’s performance criteria of curve passing is excellent, its every criteria in steady-state is superior to conventional two-axle bogie, and it can be guided by radicalregulate components on the curves which radius is smaller than 120m. The same as general two-axle bogie, portal radical driving bogie’s performance in hunting stability and curve passing is also in conflicting, when the parameters are in favor of hunting performance, the steady-state of curve passing need longer time, but all the final states of curve passing are the same.3 Because portal radical driving bogie passes all excitations of rail to car body, two-axle bogie transfer only half, the disturbances in car body using portal radical driving bogie is more, so the single-axle bogie’s smoothness is not good.In total, the smoothness and lateral stability on the urban mass traffic rails of portal radical driving bogie have met the qualifications of interrelated standard, and it is very suitable for urban mass traffic lines which have many curves and most of which have small radius because of its predominant performance in curve passing. Own to the super low floor, it is convenient for people to get on and off. It is a new bogie at the glorious prospect.

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