In this paper, an assumption has been made that during the work of a straight working element of a rotary subsoiler at each infinitesimal moment of time, the subsoiler action on soil reflects the action of the narrow implement, set in
such position as the rotary element. According to a majority of the models describing operation of the passive implements, it has been assumed that the implement working surface at each position covers the distance from the existing depth of the tine end immersion depth up to the free surface of soil, while its disturbances occur in a three-dimensional space— with consideration to the critical depth. However, during the work of the rotary element – differently as with passive element – the critical depths and then the outlines of the side part of the disturbed soil lump will vary in particular implement positions. For that reason, in order to consider the effect of the disturbed lump side parts, it has been assumed that above the critical depth on side surfaces of soil prism placed in the central part – corresponding to the implement
width – there occur forces resulting from the pressure of adjacent soil layers, angle of internal friction and soil cohesion (Perumpral et al., 1983). These forces are taken into account in searching for minimal values of resistance.
In this paper, an assumption has been made that during the work of a straight working element of a rotary subsoiler at each infinitesimal moment of time, the subsoiler action on soil reflects the action of the narrow implement, set insuch position as the rotary element. According to a majority of the models describing operation of the passive implements, it has been assumed that the implement working surface at each position covers the distance from the existing depth of the tine end immersion depth up to the free surface of soil, while its disturbances occur in a three-dimensional space— with consideration to the critical depth. However, during the work of the rotary element – differently as with passive element – the critical depths and then the outlines of the side part of the disturbed soil lump will vary in particular implement positions. For that reason, in order to consider the effect of the disturbed lump side parts, it has been assumed that above the critical depth on side surfaces of soil prism placed in the central part – corresponding to the implementwidth – there occur forces resulting from the pressure of adjacent soil layers, angle of internal friction and soil cohesion (Perumpral et al., 1983). These forces are taken into account in searching for minimal values of resistance.
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