The Dynamic Study Of Locomotive Radial Bogie’s Coupling Rod

Radial bogie locomotive can improve the locomotive curve performance well and reduce wheel and rail wear. It also can reduce the force between wheel and rail and improve the speed of the locomotive through the curve and can significantly improve the traction of locomotives.In this paper, through the simplified mechanical model of DF8B diesel locomotive radial bogie, the formula of coupling rod’s loads can be deduced. In the straight track condition with different train speed, the result of simulation and test can be got respectively by the simulator software SIMPACK and real vehicle test. Through contrasting the theoretical value, simulated value and test value of the loads of the coupling rod of the bogie, the accuracy of theoretical derivation has be verified. With the conclusion of the analysis, the factors affecting the coupling rod’s loads in the straight condition are founded. Then, to analyse the strength of the coupling rod working in curve condition for radial bogie. The author used the multi-body dynamic software Simpack to model the dynamic model of DF8B diesel locomotive and the theoretical formula was verified by the curve condition simulation results. On this basis, the author studied the six impacts of operation curve radius, outer rail super elevation, speed, track irregularity and the structural parameters on the coupling rod’s loads. We can get the message by the results:the rod’s loads increased by about 25～30kN when the locomotive’s speed increased 20 km/h; when rod’s offset increased approximately 10% and 20%, respectively, rod’s loads were reduced by 8.8% and 16.5%.Electric locomotive modified with radial bogie can solve their running wheel-rail wear problem. Firstly, the simulation analysis of the coupling rod of HXDIChigh-power electric locomotive with radial bogie was provided and the rod’s loads by simulation and calculated were compared at the same time.then, the author analyse the impact of different factors on the coupling rod. In this paper, in order to keep the important component of radial institution coupled rod work properly in the locomotive operation and ensure high stability, the author use of multi-body dynamics software SIMPACK modeled the dynamic model based as high-power electric locomotives HXD1C real car model. The dynamics simulation has done in the three aspects:whether if add the resilient support in the middle of the rod, cross-sectional dimension of the rod and the supporting stiffness. It was found that changing the bearing stiffness and the cross-sectional dimension of the rod has little effect with the longitudinal loads but will affect the locomotive the horizontal and vertical displacement of rod. On this basis, the dynamic optimization has done in cross-sectional size and bearing stiffness of the coupling rod.