Author： Hettiaratchi D.R.P.
Publisher： Academic Press
ISSN： 0021-8634
Source： Journal of Agricultural Engineering Research, Vol.67, Iss.2, 1997-06, pp. : 113-125
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Abstract
The contact zones between the discs of agricultural tillage implements and the soil are spherical surfaces with complex circular boundaries. These are normally concave surfaces, but under certain operating conditions the outside convex side of the disc comes into contact with the soil. This paper examines the disc attitudes which cause such zones to appear and presents a model for computing the size and shape of the areas involved. The analysis deals with discs of any size and curvature with its rotational axis inclined away from the vertical and the direction of travel. Part 2 of this presentation develops procedures for the practical application of the theoretical concepts developed in this part for calculating the geometrical features of the contact zones.
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