Analysis and Calibration of Rapeseed Discrete Element Simulation Parameters
To obtain the rapeseed discrete element simulation parameters,this study used simulation software to model the rapeseed particle accumulation experiment under different parameter combinations.MATLAB image processing technology was used to perform the linear fitting on the edge contour of the accumulation angle,obtai-ning precise angles of repose as response values.The simulation number for rapeseed discrete element was then optimized based on the response surface.The study applied a Plackett-Burman test to screen 10 initial parame-ters and found that the static friction coefficient of rapeseed-rapeseed,the static friction coefficient of rapeseed-organic plate,and the rolling friction coefficient between rapeseed-rapeseed had significant effects on the an-gle of repose of the particle pile.After determining the optimal value intervals through the steepest ascent test,a second-order regression model of the angle of repose and the significance parameter was established and opti-mized using the Box-Behnken test results,leading to the identification of the most influential parameters.The optimal combination included a rapeseed-rapeseed static friction coefficient of 0.284,rapeseed-organic plate static friction coefficient of 0.283,and rapeseed-rapeseed rolling friction coefficient of 0.036.Comparisons be-tween the angle of repose obtained from simulations under the best parameter combination and real test values showed no significant difference(P>0.05),indicating the feasibility of using response surface optimization for rapeseed discrete element simulation parameters.Moreover,the calibrated best parameter combination can serve as a reference for selecting parameters in rapeseed discrete element simulations.
RapeseedDiscrete elementParameter calibrationAngle of reposeOptimization
NETL
NSTL
万方数据
