Discrete Element Simulation Based on Elastic–Plastic Damping Model of Corn Kernel–Cob Bonding Force for Rotation Speed Optimization of Threshing Component

Current corn kernel-cob bonding mechanics models (LSD models) uniformly consider the force changes during maize threshing operation as an elastic change, resulting in computational errors of up to 10% or more discrete element simulations. Due inability perform high-precision simulation characteristics operation, core operating parameters thresher (rotation speed component) rely mainly on empirical settings, a consistent difficulty exceeding 85% ear rate. In this paper, by testing kernels, is found have both and plastic process. An elastic–plastic (EP) damping model kernel–cob was established introducing restitution coefficient e achieve integrated consideration two changes. By relationship between properties itself parameters, pattern effect moisture content loading direction EP found. establishing cob’s own parameter values can be determined simply determining ear. analysis process variation kernel cob realized self-developed AgriDEM software. At meantime, optimal component rotation under different conditions were obtained optimization speed. The test results showed that rate could reach than 92.40% after adopting optimized value paper. Meanwhile, based did not significantly differ from measured thresher. Compared with most widely used LSD model, reduce error 3.35% 6.05%.