In response to the lack of high-speed EMU dynamics index distribution characteristics after changes in the dynamic parameters of key suspension components in service,the radial and axial stiffness of positioning nodal point of rotary arm,and the damping force of the anti-yaw dampers at 0.01 and 0.02 m·s-1 loading speeds of a certain type of high-speed EMU with an operating mileage of 1.45 million km were tested and statistically analyzed,and all the results obeyed normal distribution.The parameterized dynamics simulation model of the EMU was established and validated,the stiffness of positioning nodal point of rotary arm and the damping force of the anti-yaw damper were considered as random variables,and then a high-speed EMU dynamics simulation method based on the improved Latin hypercube sampling was constructed,which included Latin hypercubic sampling,the combination of the wheel-rail profile with sampling results,the replacement of EMU simulation model parameters,EMU dynamics simulation and dynamic index calculation,and statistical analysis of dynamic index.The results of the dynamic simulation calculation of the high-speed EMU using this method show that:the derailment coefficient,wheelset lateral force and bogie lateral acceleration of the high-speed EMU in service for nearly 1.45 million km show an upward trend with the increase of wheel wear,and the rate of wheel load reduction,vertical smoothness indexes and lateral smoothness indexes show an upward and then a downward trend,but all the dynamic indexes do not exceed limited values;the derailment coefficient,the rate of wheel load reduction,lateral wheelset force,lateral smoothness indexes,vertical smoothness indexes and bogie lateral acceleration are all normally distributed;the derailment coefficient distribution range from 0.036 to 0.207,the mean value is 0.075,the standard deviation is 0.020,the distribution range of the rate of wheel load reduction is 0.107 to 0.262,the mean value is 0.164,and the standard deviation is 0.036;the lateral wheelset force distribution range from 4.209 kN to 16.701 kN,the mean value is 8.438 kN and the standard deviation is 2.221 kN;the lateral smoothness index distribution range from 1.351 to 2.469,the mean value is 1.566,and the standard deviation is 0.149;the vertical smoothness index distribution range from 2.260 to 2.323,the mean value is 2.273,and the standard deviation is 0.005;the distribution range of the lateral acceleration of frame is 0.906 to 3.994 m·s-2,the mean value is 1.978 m·s-2 and the standard deviation is 0.590 m·s-2.
关键词
随机参数/转臂节点刚度/抗蛇行减振器阻尼/轮轨型面/安全性/稳定性/平稳性/正态分布
Key words
Stochastic parameters/Stiffness of positioning nodal point of rotary arm/Damping of the anti-yaw dampers/Wheel-rail profile/Safety/Stability/Smoothness/Normal distribution
维普
万方数据