Abstract:

Dynamics stability of tractor-semitrailer is influenced by multiple parameters， and the influence rules and effect degree of related parameters on dynamics stability are still unclear. To this end， in this paper a 7-degrees-of-freedom dynamic model of tractor-semitrailer is established and validated in several test scenarios by comparing to the TruckSim model that is calibrated with experimental data. Then， the influence of key parameters on dynamics stability is investigated by the established model， such as vertical position of semitrailer’s mass center， axles’ cornering stiffness of the tractor and semitrailer， roll stiffness of the tractor and the semitrailer， the roll stiffness of the articulation point， and sprung mass of the trailer. On this basis， a quantitative analysis is performed with the TruckSim model， and the influence percentage rates and changing rules of key parameters are obtained. The influence percentage of the vertical position of semitrailer’s mass center is 3.14%~4.53%， sprung mass of the trailer 23.34%~34.66%， front axles’ cornering stiffness of the tractor 20.87%~30.38%， rear axles’ cornering stiffness of the tractor 21.67%~33.72%， axles’ cornering stiffness of the semitrailer 5.74%~8.48%， roll stiffness of the tractor 3.55%~6.81%， roll stiffness of the semitrailer 1.19%~3.15%， roll stiffness of the articulation point 0.33%~0.73%. The research results can provide a theoretical foundation for the optimal design and safety driving of tractor-semitrailer.

Key words: tractor-semitrailer, dynamics stability, key parameters, influence rules, quantitative analysis