Download e-book for kindle: Off-road Vehicle Dynamics: Analysis, Modelling and by Hamid Taghavifar, Aref Mardani

By Hamid Taghavifar, Aref Mardani

This publication offers with the research of off-road automobile dynamics from kinetics and kinematics views and the functionality of car traversing over tough and abnormal terrain. The authors ponder the wheel functionality, soil-tire interactions and their interface, tractive functionality of the car, trip convenience, balance over maneuvering, brief and regular country stipulations of the automobile traversing, modeling the aforementioned facets and optimization from lively and car mobility views. This e-book brings novel figures for the brief dynamics and unique wheel terrain dynamics at on-the-go condition.

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Additional info for Off-road Vehicle Dynamics: Analysis, Modelling and Optimization

Example text

The tire tractive (braking) force is given by: Ft ¼ lðkÞNv ð2:13Þ where the normal tire force (the reaction force from the ground to the tire), Nv, relies on vehicle parameters such as the mass of the vehicle, position of the vehicle center of gravity, and the steering and suspension dynamics. Applying a driving torque or a braking torque to a pneumatic tire produces tractive (braking) force at the tire-ground contact patch. The driving torque produces compression at the tire tread in front of and within the contact patch.

5 Tire Rolling Resistance One of important tire-road force products is the rolling resistance that is basically the parasitic energy dissipated by tire and the main source for loss of energy is the constant deformations of the tire while traversing and the soil beneath wheel. The phenomenon is quite complicated, and almost all operating conditions can influence the final product. In off-road vehicles during wheel motion the tire interacts with soil (depending on contact area) and a phenomenon occur known as rolling resistance wherein mechanical energy is changed to heat which is the consequence of rubber and soil deformation.

The camber angle can be clearly identified in Fig. 9. The sideslip angle a is the angle between the velocity vector v and the x-axis measured about the z-axis (Fig. 9). The force system that a tire receives from the ground is assumed to be located at the center of the tireprint and can be decomposed along x, y, and z axes. Therefore, the interaction of a tire with the road generates a 3D force system including three forces and three moments (Fig. 9). Fig. 1 29 Forces and Moments Longitudinal force Fx is a force that operates in the direction of the x-axis.

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