טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
Ph.D Thesis
Ph.D StudentOsetinsky Alexander
SubjectThe Operation of a Pulled Driving Wheel in Various Soil
Conditions
DepartmentDepartment of Agricultural Engineering
Supervisor Professor Emeritus Shmulevich Itzhak


Abstract

This research focuses on applying a semi-empirical model for wheel-soil interaction based on the assumption of a parabolic wheel-soil contact area in order to predict the traction performance of a moving wheel operating in driving and braking modes, affected by load transfer. Prediction of traction performance of a driving wheel considers the wheel-soil interaction in two interrelated aspects - force equilibrium and kinematics. Simulations show significant non-symmetry of the traction performance of the driving and braking wheels. The braking force is significantly greater than the traction force reached in the driving mode. Simulated traction performances of front and rear moving wheels differ significantly, due to the load transfer. In the driving mode, the rear wheel develops a net traction force greater than that of the front wheel. On the other hand, in the braking mode the front wheel develops a braking force significantly greater than that of the rear wheel due to a pushed/pulled force affected by the load transfer. The suggested model was successfully verified by the experimental data reported in literature as well as by full-scale field experiments with a specially developed single-wheel tester. The developed approach may improve the prediction of off-road multi-drive vehicle traction performance.