Simulation analysis of anti-drag effect of rotary vibrating tillage based on smoothed particle hydrodynamics method

In order to study the anti-drag effect of vibratory rotary tillage, this paper conducted a simulation analysis of the rotary tillage cutting process under multiple working conditions by using the Smooth Particle Hydrodynamics（SPH） method. The simulated forces on the cutter roll, obtained for tilling depths of 0. 10 m and 0. 11 m, were compared to those calculated with empirical formulas, resulting in errors of 11. 87% and 12. 86%, respectively. The soil fragmentation line was perpendicular to the blade tip. As the tilling depth increased, the soil particle velocities decreased, confirming the effectiveness of the simulation model. As the tilling depth and rotational speed increased, soil kinetic energy, internal energy and tool kinetic energy all increased. When the tilling depth increased from 0. 10 m to 0. 14 m, the proportion of soil′s acquired kinetic energy increased from 77. 51% to 78. 86%. When the rotational speed increased from 3. 6 r/s to 5. 2 r/s, the proportion of soil′s acquired kinetic energy decreased from 79. 41% to 72. 95%, indicating that only increasing the rotational speed had limited effects on improving soil tillage effect. A simulation analysis of the vibratory rotary tillage process induced by the eccentricity of the rotary tiller was conducted. When the eccentricity was 0. 05 m and the rotational speed was 4. 0 r/s, 4. 4 r/s, and 4. 8 r/s, the average anti-drag rate was 58. 46%. When the tilling depth was 0. 10 m, 0. 12 m, and 0. 14 m, the anti-drag rates were 50. 6%, 46. 3%, and 43. 1%, respectively, and the anti-drag rate decreased with increasing tilling depth. With increasing eccentricity, the forces acting on the cutter roll showed fluctuating decreases. The research results can provide a theoretical basis for the development of vibratory rotary tillage equipment.