Measurement of Contact Parameters and Discrete Element Simulation Calibration of Rice Bran and Broken Rice
In order to determine the contact parameters required for the discrete element simulation of rice bran and broken rice separation equipment,the contact parameters of rice bran and broken rice particles were measured and calibrated through bench test and simulation test.By free-fall impact method,impact diffusion method,inclined plane sliding method and inclined plane rolling method respectively,it was calibrated that the collision recovery coefficient between broken rice and acrylic was 0.45,static friction coefficient was 0.38,rolling friction coefficient was 0.17,the collision recovery coefficient between rice bran and acrylic was 0.15,static friction coefficient was 0.76.Based on the measurement test of repose angle and MATLAB image processing technology,the repose angle of particle reactor was obtained.Through the steepest climb test and quadratic orthogonal rotation combination test,a quadratic regression model between the influencing factors and repose angle was established,and the minimum relative error of the repose angle was taken as the constraint condition to optimize the regression equation.The optimal parameter combination was obtained:static friction coefficient 0.60,rolling friction coefficient 0.40,collision recovery coefficient 0.61 for broken rice;static friction coefficient was 0.81,the rolling friction coefficient was 0.18,and the collision recovery coefficient was 0.15 for rice bran.The results provided reference for the discrete element simulation parameter setting of rice bran and broken rice separation equipment.
rice branbroken ricediscrete element methodcontact parameterscalibration of parameters
万方数据
维普
