中文摘要：

为研究不同轮径转向架动力学性能差异,基于车辆动力学和赫兹非线性接触理论,在恶劣线路下,采用2种不同轮径转向架的机车模型进行分析。主要考察研究轮径由1 050mm变为1 250mm,车辆的簧下质量有一定程度的增大时,对机车动力学性能以及轮轨接触磨耗的影响。结果表明,轮径增大后轮对、构架频响特性差异很小,通过赫兹非线性接触理论进行分析发现,轮径增大轮轨弹性变形增大,接触面积随之增大;黏着力与黏着系数同时变大,所传递的切向力升高,蠕滑力减小,轮对踏面磨耗功率降低,踏面磨耗得到一定改善。结果还表明,随着轮径增大车体质心的升高,在不同速度下车体平稳性指标发生一定的恶化,而一系簧下质量增大又降低了转向架临界速度。

英文摘要：

To study the differences of dynamic performance of bogies with different wheel diameters,based on the theory of vehicle dynamics and Hertz nonlinear contact theory,the locomotive model with bogies using 2different kinds of wheel diameters under harsh railway conditions was analyzed.The impact of the change of wheel diameter from 1 050 mm to 1 250 mm,which led to the increase of the sprung mass,on wheel-rail contact wear and locomotive dynamic performance was studied.The results showed that the difference in frequency response characteristics of wheelset and frame between the two kind of bogies was small.The analysis of Hertz nonlinear contact theory found that the increase of wheel diameter led to wheel/rail elastic deformation and the increase of contact area.At the same time,with the increase of adhesion force and adhesion coefficient,the tangential force increased and creep force was reduced,which resulted in the reduction of wheel tread wear power and improvement of the tread wear.The results further showed that with the increase of wheel diameter and elevation of center of vehicle mass,the vehicle stability index under different speeds deteriorated to some extent.The critical speed of the bogie was decreased with the increase of the sprung weight.