PROJECTING OF THE MACHINE WORKING BODIES, INTERATINGN WITH SOIL
The method for curved surfaces designing of machine working parts surfaces interacting with soil environment has been proposed. It has been proved that tillage machines working parts designing, presupposing energy saving minimization aimed at normative quality reaching, can be reached not by means of direct problem solution, but the inverse one, that is, by means of defining the degree of influence of certain state of soil environment on the working part surface being designed.
To predictthe degree of in fluency of certain state of soil environment at the working part surface it has been proposed to take into account the properties, that is, skeleton resiliency as well as soil parts connections, being preconditioned by viscous (Newtonian) and dry (Coulomb) friction.It has been noted, that the magnitude of inner connections between soil parts can be defined at the expanse of tangential and normal tension defining at any point of curved surface being designed. When defining the values of tangential and normal tensions that occur on the working part surface it is important to take into account the location of elementary surface to horizon, that can be considered as “supported wall”. It enables to define soil pressure force at elementary surface plane according to the methods, having been worked by V.V. Sokolovsky. Soil pressure force at the elementary working part surface, being defined by the values of tangential and normal tensions, is being proposed to define at the expanse of defining the minimal soil pressure at the elementary working part surface. Is proposed to take into account such a pressure as optimization criterion, which presupposes the defining the following parameters for surface forms, under which energy consumption for soil slice separation should be minimal. Forgetting the optimization criterion values the integral equation, taking in to account the following as sumptions, has been proposed:it is considered, that resistance at any part of working part curved surface depends only at digging depth and doesn’t depend on vertical parts.
Key words: excavation bracket, surface form, pressure, soil environment, pressure force, energy consumption.