Dynamic Performances of Tractor-Trailer Combinations for Farm Use (II)

Lateral Forces of Driven or Braked Tires

Abstract

To predict lateral forces of driven or braked tires, a simple dynamic model of tire-ground interactions was proposed. And for investigating the adequacy of the tire dynamic model, verification tests were also carried out.
The conclusions were as follows: (1) As slip on the tire centre plane dimension was within the extent of -40%-40%, that is, |s_x|<40%, simulation results from the tire dynamic model were in agreement with the verification test results in general. (2) When the tire slip angles became larger, the driving or braking force coefficients became smaller. However, the lateral force coefficients became larger. And the lateral force coefficients decreased as the driving or braking force coefficients increased. (3) The relationships between the tire slip angles and the lateral force coefficients were found to be unlinear. When the tire slip angles were less than 5°, the variation of the lateral force coefficients was larger relatively.