Factors Affect Slipping of Automobiles

Abstract

This paper presents analysis for the slipping phenomenon in automobiles; the parameters affects slipping of automobiles are discussed. An analytical equation is constructed to relate all factors affect slipping ratio. Some relations are predicted to show the factors affect the slipping in automobiles. It is found that the parameters affect slipping can be summarized as: radius of curvature of the curve, angle of the curve (slope), RPM of the tire, radius of the tire in addition to the nature of the road. It is found that: as the normal acceleration increases the slipping ratio decreases, as the RPM of the tire increase the slipping ratio increases and as the radius of the tire increases the slipping percent increases. It is obvious that as the path slope (tan θ) increases the slipping value decreases. It is noticed that: as the radius of curvature increase the slipping % decrease which is logic, since the slipping on straight dry path is nearly close to zero. Also it is noticed that: as the tire radius decreases the slipping % increases.

Method of indicating effective circumferences of rolling vehicle wheels

“…If a wheel is rolling without skid, the kinematic radius of a rigid wheel equals its geometrical radius. When the skid value is positive (driven wheel), the kinematic radius decreases, while during braking (negative skid) the radius value increases [3,7]. It is not, however, clear, how the tyre skid was determined.…”