Particle dynamics method: simulation of a combined tillage tool used in reforestation and forest protection

For a theoretical study of the process of interaction between the working bodies of a combined tool with forest soil, a mathematical model has been developed. The aim of the study is to develop a mathematical model based on the method (DEM), which makes it possible to evaluate the influence of the parameters of the combined tool, the technological parameters of the process and the parameters of the forest soil on the power characteristics experienced by the tool. With the help of the developed model, the principle of combining working bodies was tested, that is, simultaneous tillage by working bodies of two or more types installed one after another. For this, computer experiments were carried out on the movement of the combined tool in the forest soil until the tool entered the steady-state processing mode. On the basis of a series of computer experiments with the model, the nature of the influence of the parameters of the combined tool, technological parameters of the process and forest soil parameters on the power characteristics experienced by the tool has been established. It was determined that the force of resistance to the movement of the combined tool for wet sticky soils is 0.886 times lower than the sum of the forces of resistance to the movement of individual working bodies. For dry sandy crumbly soils, this effect of 0.985 is practically not expressed. The particle dynamics method was used for modeling. The virtual soil channel had a length of 4 m and a width of 1.2 m. The horizontal speed of the working body was set equal to 1 m/s, and the total model simulation time was 3 s. To cover a wide range of forest soil parameters, experiments were carried out with soils of two types: wet chernozem with significant soil cohesion and dry crumbly sandy soil.

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