Coupling Dynamic Modeling And High Performance Computation Of Vehicle-track System

With the rail vehicles’ speed and loads increasing and driving environment becoming more complex, vehicle-rail system faces increasing pressure. In order to make them work safety and smoothly, good studies on vehicle track coupling dynamics is of great significance.In this paper principles of coupling dynamics are used to simplify vehicle track systems and influential parts are reserved for analysis. C62A and common truck T50rail are used for mathematical modeling and analysis. Rails will be considered as continuous Euler beams, sleepers and ballast beds as discrete bodies, and all parts of body as a rigid body, and all parts are connected with spring-damper model. Based on the research of the simplified physical model, numerical integration method are used to build the nonlinear integral model of the whole system, and at the same time the Newmark-β correction method is adopted for analysis and calculation for vehicle track coupling dynamic mathematical model. Calculation is done on Matlab platform to improve efficiency of graphic output and calculation.In this paper, there are more freedom and smaller integral step length for the spatial equation of mathematical model, and variable step is used for calculation. At the same time, parallel computing method is introduced to improve the efficiency of calculation. Data parallel and task parallel tasks are done for different program block separately in order to realize efficient computation. In order to make a true simulation on the process of vehicle driving, in this paper the USA random irregularities track spectrum is adopted as turbulence spectrum, and the period method is adopted for the extraction of the orbital spectrum, and Hertz nonlinear contact theory is used to calculate the force between of wheel and rail. The random irregularity leads to random wheel-rail forces. and wheel-rail relationship becomes the feedback pivot of the whole system. To know the running state of vehicle under different conditions, running speed of railway vehicles, orbit parameters, the parameters of the ballast bed are changed to calculate speed, acceleration, displacement, force and vibration of vehicle parts and rail systems in all planes. Further study on vehicle track system in the vertical and horizontal direction is done, and data is analyzed and compared to find the optimal parameters for the vehicle.