The Influence Of Suspension Parameter Nonlinearity On Vehicle Dynamics Performance

As the most important part on the bogie of high-speed train, suspension system paradise the vehicle’s riding quality, stability, safety riding comfort and so on when running on straight line and passing curves, in a word, suspension parameters’ properties are good or bad has serious significance to equipment. In the former analysis, in order to simplify the complexity of models, regarding the suspension parameters are linear elements, so the calculating results exist errors compared with actual stiffness and damping, with the development of computer technology used in mechanical train study, the demands for accuracy of simulation results are more rigorous, so analyze the influence of suspension parameters’ nonlinearity on vehicle dynamics is necessary.In this paper, take one CRH model, calculating and analyzing the vehicle dynamical performance when running on straight line and passing curves, in order to reflect the influence of suspension parameters’ nonlinearity on vehicle dynamics more clearly, first calculating and analyzing the linear model’s critical speed, wheelset lateral displacement, wheels lateral acceleration and wheel lateral force on straight lines and wheels tread friction power, wheel lateral displacement, derailment coefficient when on curves. Then by changing single suspension parameter nonlinearity or change two suspension parameters nonlinearity at the same time, comparing the calculation results with the nonlinear state results, analyzing the influence the influence of suspension parameters’ nonlinearity on vehicle dynamics more specific and more detailed.When riding on straight lines, comparing the calculating results between nonlinear model and suspension parameters are nonlinear states, vehicle critical speed decreased 223km/h, the maximum value of wheel lateral acceleration decreased from 3.75m/s2 to 2.44m/s2, the right maximum value of wheel lateral displacement decreased from 4.4mm to 3.65 mm, the left maximum value of wheel lateral displacement decreased from 5.05 mm to 4.22 mm, the maximum value of wheels tread friction power decreased from 1350Nm/s to 460Nm/s.When passing minor radius curve, the right maximum value decreased from 8.3mm to 4.1mm, the left decreased from 9.9mm to 4.6mm on right curve; the right maximum value decreased from 9.85 mm to 4.15 mm, the left decreased from 7.0mm to 4.22 mm on left curve; when passing smooth radius, the right maximum value decreased from 1.9mm to 0.7mm, the left decreased from 4.1mm to 1.8mm on right curve; the right maximum value decreased from 4.05 mm to 2.0mm, the left decreased from 6.05 mm to 2.4mm on left curve; while wheel lateral force and derailment coefficient have no large extent variation.