| Abstract [eng] |
The Master's thesis examines the stability of the vehicle at different speeds selected in 3 load cases where the center of gravity position changes. The study involves three stability tests, which are governed by ISO standards. During the first steady-state circular driving behaviour test, when driving at a radius of 30 meters circle, changing the travel speed for each load. Limit of lateral acceleration has been determined by handling diagrams. The vehicle loses its adhesion to the road surface while maintaining stability when limit of acceleration is achieved. During double lane change test in each load case, when the vehicle speed is changed the cases in which the vehicle loses stability were determined. The lateral transcient response test examines the vehicle's stability when traveling on 4 different road surfaces at two different speeds and a sharp steering turn at 4 angles. For this part of the study limit of lateral acceleration for each road pavement were calculated from the ratio of the coefficient of adhesion of the road surfaces. The influence of driving speed, weight center position and road surface influence on car stability is investigated. The stability of the car is assessed by comparing the lateral acceleration of the car center of gravity with the limit of lateral acceleration. |
