Parameter Calibration for Discrete Element Simulation of Cistanche Seeds
The Cistanche seeds physical parameters of the discrete element simulation model were calibrated by a compre-hensive method combining physical and simulation experiments.With the resting angle of Cistanche under different physi-cal parameter combinations as the response value,the experimental factors with significant influence on the repose angle were screened by Plackett-Burman experiment.These parameters include the coefficient of static friction and rolling fric-tion between seeds,as well as the coefficient of static friction and of restitution between seeds-steel plates.The second-order regression model of repose angle and significance parameters was established by Box-Behnken experiment,and the optimal values of significant parameters were obtained,where the coefficient of static friction and rolling friction between seeds was 0.65 and 0.07,and the coefficient of static friction and of restitution between seeds-steel plates was 0.43 and 0.54,respectively.Through comparison test,the final results of the simulation and physical tests were compared in this study.The comparison results showed that the relative error of the two test results was 2.05％,which proved that the dis-crete element model and the contact parameters could be used for the discrete element simulation test in the optimization of design parameters in related machine.
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