Study On Dynamics Of Vehicle With Independently Rotating Wheel Of Non-Common Axle

Without longitudinal creep,the critical velocity of hunting is higher to railway vehicle with independently rotating wheel(IRW),this may be potential application to high-speed locomotive and vehicle ;In the meantime, By virtue of crank axle and even no axle ,it can solve partial or complete low floor in right rails. Researchers on locomotive and vehicle have accomplished a lot of study in theory and experiment at home and abroad in this area. IRW usually includes two kinds: common axle and non-common axle, they have been used in light rails, common axle IRW vehicle has been run in different gauges railway at abroad. But to non-common axle IRW vehicle, few train can be seen on the trunk railway except spanlish Talgo train;That vehicle like traditional passenger except that truck uses non-common axle IRW is adopted on the trunk railway is hardly reported theoretically, this thesis will make a probe in this area to the vehicle on the tangent track.In this thesis, traditional wheelsets are replaced by non-common axle IRW, other structure and size of truck and car body do not change basically expect frame and beaningbox.In order to compare conveniently, dynamical models of traditional vehicle,common axle and non-common axle vehicle are established ,dynamical differential equations are attained by a kind of faster method ;To solve the vehicle system equation of motion for nonlinear ,this thesis use Newmsrk's explicit method as a numerical integration method to simplify the integration process, when adopting this algorithm, the solution of high order equation is no longer necessary and the computational time will be greatly reduced; program of three kinds model are programmed by Fortran95,in these program, other real number use double precise except integer to improve precise .On this basis ,critical velocity and main dynamical preference of those model are analysized at detail. Finally, dynamical response of non-common axle IRW vehicle are analysized with the change of main suspension parameter.Study show that non-common axle IRW vehicle has higher critical velocity and better lateral dynamical performance in comparison with traditional vehicle.Its eight wheels lean to track center in the course of running and its yaw angle is more magnitude than traditional vehicle.But the vaule of yaw angle and its velocity have the trend to rise when first longitudinal suspension staffness is lower certain vaule.