This dissertation is dedicated to providing reliable simulation models for the tire-soil interaction. Analytical models which could be integrated in Multi-Body Simulation (MBS) software have the advantages that the computational efficiency is high and these models could be applied in the simulations of vehicle-soil interaction. However the stress analysis inside the tire-soil interaction interface is not available with the analytical models. Finite element (FE) models provide opportunities to study stresses not only inside the tire-soil interaction interface, but also in the tire and soil models. Besides the geometrical features of tires such as tread patterns and inner reinforcement layers could be considered in the FE models. These two methods (analytical and finite element methods) were applied to model the tire-soil interaction. For the analytical model, the major objective is to study the geometry of the contact contour and the stress on the tire-soil interface. Empirical equations such as the sinkage-pressure and shear stress-displacement relationships were used to predict the normal and tangential stresses on the tire-soil interface. Due to the fact that these empirical equations are derived from quasi-static experiments, the influence of the penetrating velocity on the soil mechanical characteristics is not considered. In the normal direction, the sinkage-pressure relationship which is similar like a non-linear spring was applied to link the quasi-static radial stress to the tire sinkage. To account for the dynamic radial stress, dampers parallel to the non-linear springs were added. A substitute circle larger than the unloaded tire was adopted to model the contact contour of the deformable tire. The forces and moments developed on the tire-soil interface were calculated by integrating the stresses in the longitudinal, lateral and vertical directions along the contact contour. The equations accounting for the forces and moments were compiled as subroutines in the MBS software Adams. A number of simulations were carried out to study the soil damping effect, the soil compaction, the reacting forces and moments for the rigid and deformation tires under different operating conditions. Exponential equations were applied to fit the soil deformation/tire deflection-wheel load curves, and the Magic Formula (MF) models were applied to fit the longitudinal slip - longitudinal force and the lateral slip-lateral force/anti-aligning torque curves.


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    Title :

    Analysis of off-road tire-soil interaction through analytical and finite element methods


    Contributors:
    Li, Hao (author)

    Published in:

    Publication date :

    2013


    Size :

    157 Seiten, Bilder, Tabellen, 170 Quellen




    Type of media :

    Theses


    Type of material :

    Print


    Language :

    English





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