抑制轮轨摩擦自激振动的扣件结构多参数拟合研究

为研究扣件结构参数对轮轨摩擦自激振动的影响,基于轮轨摩擦耦合自激振动的观点建立了小半径曲线轨道整体道床支承的轮轨系统有限元模型;通过现场测试和数值仿真验证了轮轨摩擦自激振动模型,进而基于该模型研究了扣件结构中各参数对轮轨摩擦自激振动的影响;综合考虑多因素之间的相互影响,采用最小二乘法得到了预测轮轨摩擦自激振动发生可能性...

Research on Multi-Parameter Fitting of Fastener Structures to Suppress Wheel-Rail Friction Self-Excited Vibration

To study the effect of fastener structure parameters on wheel-rail frictional self-excited oscillation, based on the viewpoint of frictional self-excited vibration of the wheel-rail, a finite element model of the wheelset-track system on a small-radius curve track supporting by the monolithic roadbed was established. Then, the wheel-rail frictional self-excited vibration model was verified by the field test and numerical simulation. Furthermore, the influence of fastener parameters on the wheel-rail frictional self-excited oscillation was studied. Considering the interaction between multiple factors, the occurrence possibility of wheel-rail frictional self-excited oscillation was obtained by the least squares method. The results show that the wheel-rail frictional self-excited oscillation caused by the saturated creep force between the wheel and rail is a key reason that causes rail corrugation on a small-radius curve track supporting by the monolithic roadbed. The frictional self-excited oscillation mainly occurs at 300 Hz and 320 Hz. According to the multi-parameter fitting equation of fastener structure, when the vertical damping of fastener is 1000 N?s/m and the fastener distance is 1.0 m in the appropriate range, the possibility of wheel-rail frictional self-excited oscillation is reduced, thereby the possibility of rail corrugation is reduced.