Effect Of High-speed Train Suspension Parameters And Structure Parameters On The Dynamics Reliability

Because rail transit has the characteristics of large capacity,fast speed and low cost,the use of rail transit for the country and even the people becomes more and more obvious.With the development of high-speed train speeding up and lightweighting,the mutual movement between wheel and rail is deteriorating,and the dynamic characteristics of high-speed train vary greatly.It is of great significance to study the influence of suspension parameters and structural parameters of high-speed trains on the reliability of vehicle dynamics.Based on the random distribution of high-speed train suspension parameters and mass parameters and the wear and tear of the wheels,the reliability of high-speed train is studied and analyzed based on the theory of mechanical reliability.First of all,based on multi-body dynamics theory and SIMPACK software,a nonlinear model of high-speed train with 50 DOF is established.The train model includes body,bogie,wheelset,random orbit spectrum,suspension system and so on.The nonlinear characteristic of damper is expressed by piecewise function.The train model will be used to study the dynamic simulation of the vehicle.Secondly,in order to study the influence of wheel degeneration process on high-speed train,a regression model of wheel reliability is established and the cycle of wheel repair is analyzed.Based on the measured data of wheel wear,the degradation process of the wheel is fitted by using the non-decreasing Gamma process non-decreasing characteristic.The Copula function is used to connect the wheel rim degradation and tread surface diameter degradation.The reliability model of the wheel flame and tread surface degradation is established.In the process of repair,the relationship between flange wear and tread diameter is established,and the reliability model of wheel diameter degradation is established to analyze the reliability of the model and its reliability sensitivity.The research shows that in a single cycle,vehicle dynamics deteriorate with tread wear.According to the principle of minimum reliability sensitivity,it is most suitable when maintenance period is 230,000 km.Furthermore,based on the most dangerous tread and SIMPACK model of high-speed train established,the quality parameters and suspension parameters of the train are not designed.Through the integrated simulation of MATLAB and SIMPACK,the Latin hypercube sampling is used to get the maximum speed and fit the limit speed function with Kriging agent model.The reliability and reliability sensitivity analysis of the reliability model of the ultimate speed by the fourth-moment method and the Edgeworth series are carried out and verified by the Monte Carlo numerical simulation method.The results show that the sprung mass of the vehicle is proportional to the ultimate speed,the unsprung mass and the bogie mass are inversely proportional to the ultimate speed,and the anti-snake damper has the greatest influence on the ultimate speed reliability of the vehicle.Finally,taking into account the first-order vertical bending frequency of the vehicle body has an important impact on the comfort of the vehicle body,UIC566 and EN12663 all make the first-order bending frequency of the vehicle body are regulated.The first-order vertical bending of the vehicle body Frequency in the equipment state,need more than 10Hz;in the empty state,need more than 14Hz.By using SolidWorks to build a three-dimensional vehicle body model,using shell181 to mesh the three-dimensional model in Hypermesh.Using Latin hypercube sampling in the PSD of ANSYS,the function of body thickness,material properties and the first-order vertical bending frequency of the vehicle body is set up.The reliability model of the first-order vertical bending frequency of the car body is set up more than 14Hz and more than the(?)times of the bogie floating frequency.Combined with line sampling technique,the reliability and reliability sensitivity are analyzed.The reliability sensitivity of the car body undercarriage elastic modulus is the highest.And among the suspension parameters,the reliability of the vertical latitudinal stiffness is the highest.