The paper presents theoretical analysis of excited vibrations of the vehicle in a wide range of excitation frequencies (from I to 80 Hz). The mathematical model and calculations were prepared for the accepted physical model of the vehicle. The model was used to simulate the excited vertical vibrations. The bifurcation figures with an excitation frequency as a bifurcation parameter were determined on the basis of the simulation results - the changes of kinematics values in time. Bifurcation diagrams give a picture of vehicle vibrations. This picture gives the possibility of identification of characteristic parameters of sprigs and dumping elements and can be used for control, diagnostic aims, and for making technical investigations of vehicle suspension.

This paper focuses on the design and control of an active suspension system, where a tubular linear motor is integrated into a spring damper system of a vehicle. The spring takes up the weight of the vehicle. Therefore the electric linear motor can be designed very compact as it has to provide forces to adjust the damping characteristic only. Design and construction of the active suspension system, a control strategy and validation measurements at a test bench are presented.