Calibration Parameter of Soil Discrete Element Based on Area Difference Method

Existing calibration methods for contact parameters of soil discrete elements are primarily based on a single physical property (e.g., natural accumulation angle and shear characteristics). To solve this limitation, method the area difference was proposed in accordance with actual operation effect ridge furrow opener. The typical clay loam middle lower reaches Yangtze River (moisture content 20.66% ± 1%) used as research object. Hertz–Mindlin JKR Cohesion model selected, static friction factor rolling between 65Mn steel were determined by inclined plane mechanics method. Soil tank opening experiments quadratic orthogonal rotation combined tests carried out. MATLAB software to carry out polynomial fitting constant integral solution cross-sectional contour data obtained from measured simulated establish regression difference. optimization function Design-Expert adopted. optimal parameter combination optimizing minimum target. Based above combination, relative error that simulation test 9.15%. Finally, comparison traction resistance at stable working stage indicated value 10.4%, which is less than acceptable 15% general statistics within reasonable range. results showed particle movement mechanical properties basically consistent after calibration. In study, precise element constructed, lays theoretical basis later exploration interaction mechanism components River.