The stability of articulated vehicles has been investigated for decades. Most research has focused on directional and/or braking performance and the design of an individual component of a vehicle. Nevertheless, very little attention has been made to the influence of aerodynamic effects and roadway slope. In order to study the influence of aerodynamic effects and slope on stability a linear three-degree -of-freedom mathematical model will be used in this paper. The three degrees of freedom include lateral velocity, yaw velocity and articulation between the truck and the trailer. It is noted that roll and other effects are not included in this model for the simplicity of investigating the aerodynamic effects and the influence of slope. Transient behaviors of the vehicle are not the scope of this study. Hence, in the derivation for the roots of equations of motion, forward speed is set constant. The rolling resistance is low and frequently assumed constant at low to moderate speeds. When the forward speed of the truck/trailer increases, the aerodynamic effects increase accordingly. The relation of aerodynamic effects being proportional to the square of forward speed is usually used. Aerodynamic pitching moment on the truck will cause a front-to-rear weight transfer on the tractor. Air drag and rolling resistance on the trailer will increase the payload which in turn increases the front-to-rear weight transfer on the tractor. On the other hand, the aerodynamic pitching moment on the trailer and the uphill slope tend to decrease the load on the rear axle of the truck. The stability will be examined with summing up all the effects. The center of gravity location of the trailer is another important factor. Different locations will be used in the analysis. The individual and combined influence of aerodynamic effects and slope will be presented in this study. Results will be illustrated with tables. This study will provide a first phase analysis to vehicle design.
Analysis of speed-and slope-related stability of truck-trailer vehicles
Analyse der Stabilität von Anhängerfahrzeugen in Abhängigkeit von der Geschwindigkeit und der Fahrzeugneigung
1994
5 Seiten, 1 Bild, 4 Tabellen, 10 Quellen
Conference paper
English
Analysis of Speed-and Slope-Related Stability of Truck-Trailer Vehicles
British Library Conference Proceedings | 1994
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British Library Conference Proceedings | 1994
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