KINEMATIC MODEL OF A CAR

The travelling comfort of the driver and the passengers is an indicator that assesses the quality of the car. The travelling comfort is graded according to the rates of the general vibrations experienced by the driver and the passengers in the car while travelling. The sources of vibrations in the car are the operating internal combustion engine and the roughness of the roadway on which the vehicle is moving. Free non-subsiding and subsiding vibrations and forced vibrations of the car are examined with mathematical models. In this article a kinematic model of a car has been synthesized. The car is presented as a mechanical system composed of perfectly rigid bodies. The bodies are interconnected with holonomic constraints and elastic-damping elements. Equations of the angular velocities of the bodies of the mechanical system and of the linear velocity rates of the centres of gravity of these bodies have been derived