To establish a reasonable application range of wheel-rail contact equivalent conicity and avoid hunting instability of high-speed railway vehicles,a determination method for reasonable application limits of wheel-rail contact equivalent conicity based on modal analysis is proposed.Firstly,based on the vehicle system dynamics theory,a lateral dynamics model of high-speed vehicle system with 21 degrees of freedom is established.Secondly,modal analysis is used to calculate the modal parameters(modal frequency,damping ratio and modal shape)of the vehicle system,and a continuous tracking algorithm for hunting frequency based on minimum modal distance is proposed.Then,the minimum damping ratio of vehicle system modal is used to judge the modal shape,and the collaborative variable parameter calculation of wheel-rail contact equivalent conicity and speed is carried out to determine the application limits of equivalent conicity.Finally,the occurrence mechanism of carbody hunting instability is studied from the modal perspective.The results show that under the wide-area wheel-rail contact relationship,both the bogie hunting instability region and the carbody hunting instability region have clear boundaries and are not adjacent.For carbody hunting instability,frequency coupling is not the only determinant factor,and the frequency coupling speed is also a determinant factor.Carbody hunting instability is prone to occur when frequency coupling occurs at a higher speed.By using this method,the application limits of equivalent conicity of the high-speed railway vehicle model constructed in this paper at a speed of 350 km·h-1 are determined to be 0.07-0.41.
关键词
蛇行稳定性/高速车辆/等效锥度运用限值/模态分析/机理分析
Key words
Hunting stability/High-speed railway vehicles/Application limits of equivalent conicity/Modal analysis/Mechanism analysis
维普
万方数据