Two analytic methods (ASR and AIR) are developed to extract these parameters from the propagation matrix formulae for split shear-waves.

The dynamics model of the vehicle with independent rotating wheels is set up,and the program is compiled for simulation analysis.

Gauge-changeable bogie with independently rotating wheel;

Guiding principles of three different modes of wheel-rail systems, traditional wheelset, independently rotating wheel and coupling wheelset, are analyzed in details.

Research on the Creepages of Independently Rotating Wheels(IRW);

The difference of lateral dynamics due to different coupling degree of left-and-right independently rotoating wheels (IRW) was studied.

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.

Creep traits analysis of wheel-rail contact about independently rotating wheels;

Compared with traditional wheelsets,independently rotating wheels have high critical speed and well curving performance on the ideal line without interfer, since independently rotating wheels have no logntitudinal creepage between wheel and rail.

Independently rotating wheels which have no hunting motion in theory have a high critical speed in straight track , noises between wheel and rail may be removed in the sharp curve because longitudinal creepage of independently rotating wheels may be eliminated.