INVESTIGATION OF FEATURES OF TYRE ROLLING AT NONSMALL VELOCITIES ON THE BASIS OF A SIMPLE TYRE MODEL WITH DISTRIBUTED MASS PERIPHERY

On the basis of the brush-type tyre model the paper considers the inte raction between steady-state rolling deformable wheel and flat road su rface as well as corresponding force and moment characteristics of the wheel. At least two zones of sliding, anisotropic dry friction, slidi ng friction coefficient speed-dependent and instantaneous leap of the friction coefficient when transition from sliding to adhesion zone occ urs, have been taken into account, as well as distributed peripheral m ass of tyre, elasticity, pseudo-dry friction and damping properties in radial, tangential and lateral directions of the elements at the whee l periphery, including a visco-elastic belt. Vertical force distributi on in the contact area is not supposed to be known in advance and foll ows from the calculation. As a result, sliding zone lengths, distribut ed forces in contact area, six components of generalized road reaction reduced to the wheel center, and rolling resistance moment are found as functions of vertical load, movement velocity, longitudinal and sid e slip, friction in contact area with road, stiffness, dry friction an d damping in the tyre model elements and of distributed peripheral mas s. A computer program developed in Fortran and results of calculations are of particular interest for qualitative analysis including steady rolling of studded tyre and also racing car and aircraft tyres which p eripheral mass shows itself in a special way because of great movement velocities.