农业机械学报2025，Vol.56Issue(11)：156-164,9.DOI:10.6041/j.issn.1000-1298.2025.11.014
苜蓿种荚分离清选离散元模型参数标定与试验
Calibration and Experiment of Discrete Element Model Parameters for Alfalfa Seed Pod Separation and Cleaning
摘要
Abstract
In order to enhance the application of the discrete element method(DEM)in investigating the dynamic separation and cleaning process of alfalfa seed pods following mechanical combing detachment,and improve the accuracy of DEM-based simulations,a study was conducted to calibrate the parameters of a helical-curled alfalfa seed pod DEM model by using combination of experimental and simulation approaches.The static friction coefficient,rolling friction coefficient,and restitution coefficient for pod-pod and pod-steel plate interactions were measured by using the inclined plane method and the flat plate collision method.The actual repose angle of alfalfa pods was determined as 33.19°via the funnel drop method.A discrete element model of spiral-curled alfalfa pods was then developed by using a multi-sphere fast-packing approach in EDEM.Sensitivity analysis via Plackett-Burman experimental design identified four parameters with significant effects on the repose angle:Poisson's ratio,pod-pod static friction coefficient,pod-pod rolling friction coefficient,and pod-steel plate static friction coefficient.These parameters were further optimized through steepest ascent experiments and central composite design(CCD),yielding optimal values of 0.200,0.501,0.500,and 0.218,respectively.The maximum relative error between the simulated and experimental repose angles was 1.2％,validating the calibration accuracy.DEM simulations of the pod separation and cleaning process were subsequently performed.Field experiments confirmed the reliability of the calibrated parameters,with the maximum relative error in separation rate of 6.76％.The research result can provide a robust methodological framework for DEM-based analysis and optimization of alfalfa seed pod separation systems,offering critical parameter references for future research and engineering applications.关键词
苜蓿种荚/分离清选/参数标定/离散元Key words
alfalfa seed pod/separation and cleaning/parameter calibration/discrete element method分类
农业科技引用本文复制引用
张庆,孙立皓,樊向东,马骋昊,胡建良,刘金龙..苜蓿种荚分离清选离散元模型参数标定与试验[J].农业机械学报,2025,56(11):156-164,9.基金项目
国家重点研发计划项目(2022YFD2001902)和财政部和农业农村部:国家现代农业产业技术体系项目(CARS-34) （2022YFD2001902）
