农业机械学报2026，Vol.57Issue(7)：217-227,11.DOI:10.6041/j.issn.1000-1298.2026.07.020
油菜茎秆离散元双层粘结模型建立与参数标定
Discrete Element Double-layer Bonding Model Building and Parameter Calibration of Rapeseed Stalk
摘要
Abstract
Accurate simulation of the stalk-tool interaction during mechanized rapeseed harvesting is limited by the lack of accurate and reliable bonding parameters for discrete element stalk models.To address this issue,rapeseed stalks of the cultivar"Huayouza 62"at the optimal harvest stage were used.The intrinsic and contact parameters of the stalks were systematically determined through physical tests.A double-layer bonded model of the rapeseed stalk was developed in EDEM by using the Hertz-Mindlin with Bonding V2 contact model.Using the measured maximum bending failure force 43.02 N and maximum shear force 186.22 N as the dual response values,a Plackett-Burman design was firstly employed to identify significant factors,followed by a steepest ascent experiment to approach the optimal range,finally,a Box-Behnken design was used to optimize the solution.The results showed that the skin-skin normal stiffness per unit area X1,skin-core shear stiffness per unit area X6,and core-core normal stiffness per unit area X9 had significant effects on the model.In the optimal parameter combination,X1 was 6.80×109 N/m3,X6 was 5.93×109 N/m3 and X9 was 3.18×109 N/m3.Based on this combination,a double-layer bonded discrete element model of the rapeseed stalk was established.Simulations demonstrated that the relative errors between the simulated maximum bending failure force and maximum shear force and the measured averages were 2.11%and 2.39%,respectively.The mechanical behavior of the model was consistent with that of actual stalks.The research result can provide a reference for the discrete element modeling of rapeseed plants and the design of harvesting machinery.关键词
油菜茎秆/双层粘结模型/离散元法/双响应值/参数标定Key words
rapeseed stalk/double-layer bonding model/discrete element method/double response value/parameter calibration分类
农业科技引用本文复制引用
王晓敏,张家和..油菜茎秆离散元双层粘结模型建立与参数标定[J].农业机械学报,2026,57(7):217-227,11.基金项目
财政部和农业农村部:国家现代农业产业技术体系项目(CASR-12-27) （CASR-12-27）
