Design And Reserch On Dynamic Performance Of New Inner Axle Box Bogie For 250km/h High-Speed Wagon

As the backbone of the comprehensive transportation system,railroad is an important support for building a modernized economic system and a pioneering field for the comprehensive construction of a modern socialist country.Railroad science and technology innovation is an important part of the national science and technology innovation system,and is the first driving force leading the development of railroad.Railroad transportation has the advantages of large capacity,energy saving and environmental protection,etc.With the continuous improvement of China’s railroad network and the increasing requirements of rapid cargo transportation,high-speed freight transportation will become one of the important development directions.Compared with the mature railroad high-speed passenger transport,China’s application in the railroad high-speed freight transport is still in the blank,the development of excellent performance of high-speed wagons will be one of the key links to achieve high-speed railroad freight transport.The development of bogies adapted to highspeed freight vehicles has become an important issue at present as the bogie is the key to achieve high-speed operation of railroad vehicles.This thesis has completed a high-speed wagon lightweight bogie to meet the maximum operating speed of 250km/h based on the research of domestic and foreign high-speed wagon bogies and the development and application of high-speed inner-axle box bogies.The bogie adopts the inner-axle box structure,new axle box suspension device,articulated frame and conventional two-system air spring suspension device and other technologies.The bogie achieves significant reduction in dead weight and underspring mass compared with conventional external axlebox bogies mainly through reasonable overall bogie parameters and more detailed structural lightweight design,and its lightweight characteristics are conducive to achieving higher cargo capacity under high-speed operation conditions.Based on the actual suspension and structural characteristics of the designed internal axlebox bogie,simulation model of vehicle multi-body dynamics is constructed by using SIMPACK,and reasonable key suspension parameters of the bogie are determined through optimization analysis to make the vehicle operate under different curve radius and different speed classes,and the dynamics evaluation results obtained meet the requirements of relevant standards.By comparing the dynamics performance of the internal axlebox bogie vehicle with a conventional external axlebox bogie vehicle,the results of this thesis show that the wheelrail droop action force on the straight line and the wheel-weight reduction rate on the curve of the internal axlebox bogie have significant advantages over the conventional external axlebox bogie for further clarification and verification of the advantages and characteristics of the internal axlebox bogie.