Szabó Bálint Budapesti Muszaki és Gazdaságtudományi
Egyetem Közlekedésmérnöki Kar Gépjármuvek
Tanszék, TÖBBTÖMEGU KERÉKMODELL FEJLESZTÉSE
A GUMI DEFORMÁCIÓJÁNAK SZIMULÁLÁSÁHOZ
HOSSZ ÉS KERESZTIRÁNYÚ MEGCSÚSZÁS
ESETÉN
Road vehicles are equipped with pneumatic tires for two main reasons.
First, due to their elasticity the tires can absorb the high frequency
vibrations; the second purpose is the adhesion. To analyse the motion
of a tired vehicle, this deformation effect must be considered. If we
are only interested in longitudinal and lateral motions and deformations,
the vertical effects can be ignored. The simplest solution is to model
the wheel as a multibody system. The wheel rim is a rigid body, which
has mass and inertia around its vertical axis. Although the tire is a
continuum, it can be discretised along its circumference. The tire is
represented by tire elements, which are mass points. These tire elements
are connected to each other and to the wheel rim with springs and dampers.
Friction force arises as well on that tire elements which are in the
contact patch; therefore that elements are gripped on the ground. If
we know all the spring forces, damping forces, friction forces and outer
forces, then writing up the differential equations of the bodies, we
are able to compute the motion functions using an appropriate numerical
solver. With the above described method we can simulate the wheel sliding
motion due to different forces and torques acting on it. Both the trajectory
of the wheel and the deformation of the tire can be plotted and analysed.
Various simulations can be made with different friction coefficient,
mass, or stiffness.
