CONSTRUCTION OF A DISCRETE ELEMENT MODEL OF BUCKWHEAT SEEDS AND CALIBRATION OF PARAMETERS

In view of the lack seeds contact parameters that can be used as a reference for design key mechanical components such buckwheat planting, harvesting, and processing, this study combines simulation optimization experiments physical to calibrate simulated discrete element seeds. The non-spherical particle model was established using automatic filling method, accumulating test were carried out bottomless conical cylinder lifting method; repose angle taken response value, initial screened significance based on Plackett-Burman test; second-order regression error value parameter steepest climb Box-Behnken test. On basis, minimum goal optimize parameter, optimal combination obtained, validation tests out. screening showed buckwheat-buckwheat static friction coefficient, buckwheat-stainless steel rolling restitution coefficient had significant effects (P<0.05). 0.510, 0.053, 0.492. under 25.39°, with 0.55%, which indicated reliable. This could provide seed research development sowing, threshing hulling machinery.