Digital Design Of Arcuate Subsoiler Based On Soil Dynamics

Protective cultivation is a new type of farming methods, mechanization deep loosening soil is a key technology of protective cultivation. As the core component of deep loosening technology. For some, the quality of sub-soiling shovel marks the level of the deep loosening technology. For now, mechanization deep loosening has many problems, such as the tillage resistance of mechanization deep loosening is big, the effect is not ideal, and the strength of deep loosening shovel is not enough.The traditional ways of agricultural machine’s design leads to a long period of production design and high cost. This dissertation attempts to make a new train of thought, based on the mechanized protective farming technique. According to the complexity theory of the deep loosening and the flaws of traditional ways of agricultural machine’s design, the goal of paper is trying to reduced tillage resistance, based on reading a lot of literature and researching about the process of mechanization deep loosening, parametric Modeling, soil DYNAmics, simulation technology. The mainly content of the paper is:1) Based on the domestic and international research present condition of the theory of mechanization deep loosening, the3-D model of sub-soiling shovel was created, using Pro/E5.0software, and the model was sent to ANSYS workbench. The finite element analysis of sub-soiling shovel model was carried out with workbench. The strength and rigidity of structural was studied. The distortion, stress and modal frequency of curved sub-soiling in service load were obtained. The dimension of the sub-soiling shovel was modified based on the analysis result, and the strength and rigidity of structural were optimized.2) Soil physical properties and mechanical properties were studied, and the soil physical parameters in the soil bin were measured, so that the soil model was built based on the Pro/E5.0software, and the model was sent to ANSYS workbench for the finite element method pre-process. MAT147model was used in the LS-DYNA software as constitutive model to build soil model. Smooth Particle Hydrodynamics was used to study the large deformation of soil.3) Octagonal Ring sensor was being used to measure the force of the curved sub-soiling along X direction and Y direction, and the change of the force was being studied in at different forming conditions. Test results show that:the force had being measured by the octagonal Ring sensor were close with the results from calculation, so the laboratorial method has a good reliability as the experimental value has a little error to the theory value, and the results provided data for the optimization design of the curved sub-soiling.The stronger of curved subsoiler satisfy the intensity requirements. The optimized curved sub-soiling model reduced30%maximum stress based on the same force and fixed support. And the result shows the most important element of resistance is farming depth, and then is plow speed and degree. The result of the simulation shows good agreement with experimental data. The results indicates that the simulation method and experimental data have an important value to the research of the mechanization deep loosening.