Theoretical Research And Applications On The Low Dynamic Bogie Of Locomotive

With the increase of train speeds, wheel-rail interaction of will unavoidably be reinforced. So, in the process of locomotive designment, it is the key point and aim to develop low dynamic bogie. On the basis of a theory of vehicle-track coupling dynamics and by meas of simulation software TTISIM, the theoretical research and applications on technologies of low dynamic bogie are carried out in this thesis. Firstly, the coupling model between locomotive and track is set up, in which the suspension characteristics of the electric machinery and the clearance are taken into account, there are 5 DOFs and 3 DOFs for the electric machinery and the hollow axle, respectively, the calculated results are verified by the experimental results of the series of SS7 locomotives, and the comparison results show that it is better correlation between the calculated and measued responses, including the safty indices, and the comfort indices and the dynamic characteristics. Secondly, effects of suspention parameters and structure parameters on wheel-rail vertical dynamics are investigated, and much of measurement is put forward to reduce the vertical dynamic, results show that decreasing the unsprung mass and adopting the wear type of wheel profile are effective mothods to realize the designment with low dynamic, and the mass and inertia of bogie frame have little influence on dynamic. Thirdly, effects of locomotive parameters on wheel-rail lateral dynamic are studied to obtain the measurement reducing the lateral dynamic, calculated results show that the lateral and longitudinal stiffnesses of the primary suspension have much effect on the lateral dynamic, and the effects of parameters of secondary suspension, including the lateral and longitudinal stiffnesses, and lateral damper, are little, and the lateral dynamic can be reduced with the decreasement of unsprung mass. Lastly, application study that the measurement is adopted in the designment of two bogies is introduced, one is for the speed-raised locomotive with a speed of 160km/h, and the other is for the high-speed locomotive with a speed of 200km/h, the operation experience shows that it is very useful and effective to reduce vertical and lateral dynamic for these technologies. 76 tabs, 25 figs, 128 refs.