Study of the Lateral Displacement of the Bus in Crosswind Conditions

With its large size, aerodynamic forces and moments will significantly affect the vehicle’s stability when a bus moves in high wind. Therefore, studying the instability in general and the lateral displacement in particular of buses in crosswind conditions is a matter of concern. This paper focuses on studying the motion stability of a bus in the condition of crosswind, in which the aerodynamic forces and moments acting on the bus are determined by the simulation method of one source wind. The system of dynamic equations describing a bus’s motion in crosswind conditions is used to evaluate the instability of the vehicle’s motion, mainly to evaluate the lateral displacement of the vehicle in the following conditions: the bus speed and wind speed change. The authors used Ansys Fluent software in calculating aerodynamic forces and moments and used numerical simulation using Matlab Simulink in analyzing the motion instability of the bus. The results allow us to evaluate the level of bus lane deviation in road conditions in Vietnam.