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Technical Paper

Contact Force and Pressure between Tire and Road Using Dual Tires under Different Loads and Inflation Pressures

2008-10-07
2008-01-2685
Heavy vehicles commonly use dual tires on their load and traction axles. As the only vehicle component involved in force transmission to the road, the tire is an important element in the road damage process. In this context, two factors involved are the tire's supported load and inflation pressure. Traditional practical assumptions are that each of the tires in dual arrangement supports the same load, and that the contact patch pressure is very similar to the tire's inflation pressure. To provide data about the load distribution and contact pressure in the tire's contact patch, a lab experimental study was carried out. For that, a lab device was used to determine the static load and pressure in the contact patch, using three different sets of heavy duty radial tires subjected to several combinations of supported load and inflation pressure.
Technical Paper

Vehicle's Dynamic Behavior Simulation as a Tool for Evaluating Geometrical Changes in Roads

2009-10-06
2009-01-2921
The relationship between road geometric design and vehicles moving along it should be in a harmonic way in order to reduce the risk of accident occurrence. As a safety issue, the accident black spot analysis can lead to improvements in traffic signaling and/or to changes to the conflictive roadway section. This paper shows the applicability of the vehicle's dynamic behavior simulation as a complementary tool for evaluating geometrical modifications of roadway sections. A simplified example is described using a typical heavy vehicle, which follows a roadway section under two scenarios, one with an unchanged path and other with some modifications in order to increase safety. Results showed that vehicle's dynamic simulation can offer a detailed perspective of the vehicle's behavior to identify the effectiveness of the proposed changes before they are applied in the practice.
Technical Paper

Effect of Wheelbase Variation on the Dynamic Behavior of a Three Axles' Heavy Duty Truck

2004-10-26
2004-01-2611
The effect of wheelbase variation on the rollover threshold for a three axles' unit heavy-duty vehicle, is presented in this work. For this, a vehicle dynamic behavior simulation model to analyze lateral stability is used. Also, the concept of load distribution on rear axles and the relationship with geometric definition of wheelbase is incorporated, and so, the effect on handling characteristics is analyzed. Besides, results of the combined effect considering stiffness suspension in front and rear axles on resulting handling is included, according wheelbase variation. Results suggest a wheelbase value in which the vehicle highest rollover threshold is obtained.
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