Dynamic Performance And Longitudinal Impact Analysis Of HCG. Vehicles Based On Rigid-flexible Coupling

As for the 3-wagon group of double-decker container flatcars with the cross-loading gears (called 3-wagon group with cross-loading gear in short), which not only has the characteristics of high-center-of-gravity (HCG) vehicles, but also the cross-loading gears will also cause interaction complex problems between wagon and wagon. To this difficulty, The dynamic simulations program of the rigid-flexible-coupling based on flexible body interface processing strategy was presented and the simulation analysis contrast of the rigid-flexible-coupling with the loop rail test was carried out in initial work's foundation. In order to solve wheel/rail relation coordinated questions in the simulation and the test, the paper propose the improvement program and execute the quite comprehensive simulation confirmation. Meanwhile, In order to make data characteristic contrast for the dynamic performance and the longitudinal impact performance of the 3-wagon group with the cross-loading gear. The paper take foreign filtering sampling provision and propose the dynamical data processing methodology based on UIC518 standards.Through the simulation comparison of the loop line test and the original program rigid-flexible-coupling can obtain the common problems as follow:The 3E axis frame.ogie exist a problem between wheel/rail coordination relation in the 3-wagon-group the , cross-loading gear and the 100-130 km/h high speed application, which mainly perfofemce lateral force abnormal distribution. Along with the middle-axle wheelsets'diswroance increased and the 3rd-axis lateral force increased suddenly, to achieved the 3rd-axis lateral force is bigger than the 1 st-axis. The primary reason for creating this phenomenon is that the middle-axle wheelsets of the 3E axis frame bogie take weak restraints program design:â‘ the mid-axle wheelsets tread of the 3E-axis frame bogie take flange thinning 9mm amend tread, and the amend tread form the equivalent taper is very low, Xe~0.10, It almost no ability to meet wheel-rail return the equilibrium position;â‘¡The central axle box suspension no take wedge friction damping;â‘¢The central axis distance of the 3E axis frame bogie between the 1-axis and the 3-axis is 2.9m, however, The central axis distance for the traditional 3-piece bogie is only 1.8m. Therefore, as for the 3E axis frame bogie with the plane center plates, it cause dynamic flexibility insufficient for the vehicles which will have the possibility to cause lateral force unusual distribution in the high-center-of-gravity vehicles application.In order to solve the above wheel/rail relations coordinated problem of the 3E axis frame bogie, The article further propose the improvement program as follow:â‘ aking single bar to enhance the longitudinal position lever stiffness;â‘¡aking the better performances'flange thinning 9mm B tread to enhance wheel-rail ruturn the equilibrium position. The simulation contrast analysis indicated that the wheel-rail return the equilibrium positions'performance has improved obviously after the improvement program, the stability index relative the original program has been improved obviously, while the critical speed of the 3-wagon group with cross-loading gears from 146km/h up to 160km/h. But it also exist the deficiency to wait for us futher take the optimization plan to consummation.