轨道刚度的影响分析及动力学优化

Effect Analysis of Track Stiffness on Dynamic Characteristics of Wheel-Rail System and Its Dynamic Optimization

应用轮轨系统动力学的频域分析方法,研究了轨道刚度对轨道动力特性的影响规律.提出了轨道动力参数对轨道刚度的敏感系数的概念,依据敏感系数的特性,初步建立了轨道总刚度取值、扣件与道床刚度比值的动力学优化分析方法.作为算例,对我国高速铁路的轨道刚度进行了初步优化分析,认为轨道总刚度合理取值范围为62.0～86.9kN/mm,扣件与道床刚度的最优比值约为0.5.

The effects of track stiffness on track dynamic characteristics were investigated by the wheel-rail system dynamic analysis in frequency domain. The concepts of sensitivity coefficients of track dynamic parameters to track stiffness were put forward and defined. The method of dynamic optimization was proposed for the global track stiffness and the ratio of fastening stiffness to ballast stiffness on the basis of the characteristics of the sensitivity coefficients. As an example, this method was applied to research track stiffness in a high-speed railway in China. The result shows that the optimum global track stiffness ranges from 62 to 86.9 kN/mm and the optimum ratio of fastening stiffness to ballast stiffness is about 0.5.