Study on Effects of Road Conditions on the Lateral Instability of Tractor Semitrailer Vehicle during Turning Maneuver

Instability of vehicle can be defined as an unexpected response maneuver that induces disturbance, occurring in the ground plane. This include longitudinal, lateral, pitch, yaw, roll direction, or their combinations. Many tractor semitrailer accidents caused by lateral instabilities which may classified into two types: rollover and yaw instability. Rollover occurs when centrifugal forces imposed on during a exceed threshold vehicle. Yaw instability often vehicles turning road with low friction coefficient. The is shown loss motion trajectory Jack-knife. paper establishes dynamic model vehicle, based Multi-Body System Method analysis Newton-Euler equations Burckhardt’s tire model. applied to evaluate effect conditions maneuver. results serve basis for determining early warning controlling