摘要
研究辊式磨粉机IB磨制粉时的工作特性,对制粉过程进行仿真分析,需标定小麦籽粒与磨辊的力学参数和接触参数。使用质构仪对润麦后小麦籽粒进行力学参数的标定,得到了制粉时小麦籽粒的泊松比、弹性模量和剪切模量。采用润麦后小麦籽粒和磨辊材料平板标定小麦与磨辊的静摩擦系数和碰撞恢复系数。对于不易测量的参数,使用EDEM进行虚拟标定获得,以休止角为响应值,进行Plackett-Burman试验、最陡爬坡试验和Box-Behnken试验,得到影响小麦休止角的回归方程。以实际休止角为响应面目标,根据回归方程和响应曲面求解最优参数。研究表明:最优参数为小麦-小麦静摩擦系数0.3,小麦-小麦滚动摩擦系数0.04,小麦-磨辊静摩擦系数0.554,最优参数仿真得到的休止角与实际值相对误差率为1.12%。研究结果证明了参数标定的可靠性,可用于小麦IB磨制粉过程中仿真参数的设定。
The discrete element simulation technology can simulate wheat milling process,reduce the number of experiments,and reduce experiment cost.The discrete element simulation technology has been widely used in the agricultural field.However,there are still gaps in the mechanical parameters and contact parameters in wheat milling.In order to study the working characteristics of the roller mill IB during milling,and to simulate and analyze the milling process,it is necessary to calibrate the contact parameters and mechanical parameters between the wheat grains and the grinding rollers.According to the ASAE S368.4 DEC2000(R2017)standard,the mechanical parameters of wheat grains after moistening were calibrated by texture analyzer,and the Poisson′s ratio,elastic modulus and shear modulus of wheat grains during milling were obtained.The contact parameters of the wheat and the grinding roll were measured using the grinding roll material.The roller-wheat static friction coefficient was calibrated by the inclined plane method,and the wheat particles collided with the grinding roller material in free fall,and the collision recovery coefficient between the wheat particles and the grinding roller material was determined.The angle of repose of the wheat particles in contact with the grinding roller material was measured by the cylinder lift method.For the parameters that are not easy to measure,EDEM was used to perform virtual calibration.Taking the angle of repose as the response value,the significant influencing factors of the experiment were screened out by the Plackett-Burman test,and the ranking of the significant factors affecting the angle of repose of wheat grain accumulation was obtained.The steepest climbing test was designed to determine the value range of the optimal parameters.According to the results of the Plackett-Burman test and the steepest climbing test,a Box-Behnken test was designed to obtain the second-order regression model of the contact parameters and the angle of repose between the wheat grain and the grinding roller material.Taking the actual angle of repose as the target of the response surface,the optimal parameters were obtained according to the regression equation,response surface and contour diagram,and the optimal parameters were substituted into the EDEM for discrete element simulation test verification.The relative error rate between the angle of repose and the actual value was 1.12%.The reliability of parameter calibration is proved by error analysis,and the results of parameter calibration can be used to set simulation parameters in the process of wheat IB milling.
作者
张文龙
武文斌
吕少杰
王雪峰
贾华坡
刘培康
侯宁沛
赵岐峰
ZHANG Wenlong;WU Wenbin;LYU Shaojie;WANG Xuefeng;JIA Huapo;LIU Peikang;HOU Ningpei;ZHAO Qifeng(College of Mechanical and Electric Engineering,Henan University of Technology,Zhengzhou 450001,China)
出处
《河南工业大学学报（自然科学版）》
CAS
北大核心
2023年第2期105-112,共8页
Journal of Henan University of Technology：Natural Science Edition
基金
河南省重点研发与推广项目(2018304)。
作者简介
张文龙(1997-),男,河南周口人,硕士研究生,研究方向为粮食机械现代设计技术;通信作者:武文斌,教授,博导,E-mail:wuwenbin59@163.com。
