Research On Speed Level Of 160km/h Bogie For Suburban Railway Vehicle

Suburban railway is a rising type of rail transportation in our country recently and its functions position between the high-speed railway and urban subway transit.Suburban railway mainly serves central city and satellite cities or suburbs,in order to realize the one-hour-traffic circle for the basic goal,responsible for passenger transport which mainly includes daily commuting and short-distance traveling.Suburban trains play an extremely important role in suburban rail transit as vehicles to transport passengers which have a great impact on the capacity,environment,safety,comfort and other aspects of the suburban rail transit system.In this thesis,the design project of a bogie for suburban trains with the speed of 160km/h is proposed which is based on the operation characteristics and requirements of "fast speed,large capacity,fast start and stop,comfortable ride" and combined with the development project of the enterprise.During the design,the following research has been done in this thesis:(1)The basic structural characteristics of typical suburban railway and bogies for suburban trains at home and abroad are summarized and analyzed.The main components of a bogie such as frame,wheel-set axle box,suspensions,traction and braking devices are compared and selected.After that,the design project of a bogie suitable for domestic suburban railways with the speed of 160km/h is proposed.(2)By creating the finite element model of bogie frame and using finite element analysis software software,and the finite element analysis of the structure strength of bogie frame is carried out.The conclusion is drawn that under abnormal load conditions the maximum stress in the bogie frame designed in this thesis is 338.6MPa which is located at the transition arc between transverse and longitudinal beam.Both the maximum stress and the stress of other base material are less than the allowable stress of the material.So the static strength of the frame meets the standard requirements.Under simulate operating load conditions,the average stress and stress amplitude of each part of the frame can meet the envelope requirements of Haigh fatigue curve.It indicates that the fatigue strength of frame meets the design requirements.(3)By attaching strain gauge and using loading test bench the strength test of the frame was carried out according to standard UIC 615-4.The test results show that the maximum stress in the frame is less than the allowable stress of the material under abnormal load conditions.Under simulate operating load conditions the stress cycle is within the envelope of Goodman fatigue curve.After fatigue test no cracks of any kind appeared in the frame.The structure and performance of the bogie designed in this thesis meet the design requirements which can provide some reference for the research and design of suburban train bogie in China.