Friction between rubber roller and paddy or brown rice for paddy dehulling was much characteristic compared with that between two solid bodies. Paddy or brown rice was approximately considered as a rigid body, while rubber roller was considered as complete elastic body. Mathematical simulation of friction for paddy dehulling had been developed based upon the theory of elasticity, and of adhesion and hysteresis friction. Calculation results indicated that the adhesion force had dominant influence on the frictional force, and the hysteresis force could be negligible under normal conditions. The ...
