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Dynamical analysis plays a key role in development and optimalization of rail vehicles. The article deals with simulation analysis of a rail vehicle with an active tilting system of the vehicle body, design of the rail vehicle in CAD program CATIA and dynamical analysis in program SIMPACK, with the RAIL expansion. Such body mounting on vehicle bogies is significantly more complicated than the design of conventional rail vehicles. The purpose of this type of body mounting is to increase the size of body tilt during ride in a curve and thus reduce the lateral unbalanced acceleration affecting the passengers, or allow higher driving speed in a curve with the same radius while keeping the lateral acceleration value respectively. Eight variants of different velocity, vehicle occupancy and setting of the tilting mechanism were analyzed. We determined the average value of passenger comfort from the simulation results. We have determined the value of passenger comfort during the ride in a curve from the simulation results.

In this work a multi objective optimization is applied in order to find the optimal values of construction parameters (inertia, suspension and geometrical parameters) of a railway vehicle. The simulation results give a good transverse stability in alignment and improve the ability to steer around a curve without a high transverse displacement and without contact flange. Under these conditions, wear of both rail and wheel is attenuated, and the lifespan of the wheel and the rail are prolonged. At the beginning, one optimizes the vehicle's transverse stability, then its behaviour in curve. The results showed that there is incompatibility between a good transverse stability and a good behaviour in curve. The method of optimization used is the method of the genetic algorithms which is implemented under MATLAB. [ABSTRACT FROM AUTHOR]