适收期油菜茎秆离散元仿真参数标定与试验  

Calibration and experiment of the discrete element simulation parameters for rapeseed stems during the suitable harvest period

作　　者：郭辉 郭烈红 李海峰 董远德 周稳 韩骏轩 GUO Hui;GUO Liehong;LI Haifeng;DONG Yuande;ZHOU Wen;HAN Junxuan(School of Mechanical and Electrical Engineering,Xinjiang Agricultural University,Urumqi 830052,China;Xinjiang Key Laboratory of Intelligent Agricultural Equipment,Urumqi 830052,China;Turpan Institute of Agricultural Science,Xinjiang Academy of Agricultural Sciences,Turpan 838000,China)

机构地区：[1]新疆农业大学机电工程学院,乌鲁木齐830052 [2]新疆智能农业装备重点实验室,乌鲁木齐830052 [3]新疆农业科学院吐鲁番农业科学研究所,吐鲁番838000

出　　处：《农业工程学报》2024年第24期20-29,共10页Transactions of the Chinese Society of Agricultural Engineering

基　　金：新疆维吾尔自治区重大科技专项项目(2022A02008);新疆油料产业技术体系项目(XJARS-05)。

摘　　要：为解决在联合收获时油菜脱粒仿真过程缺乏准确可靠的接触参数和粘结参数的问题,该研究以联合收获适收期油菜茎秆为对象,利用离散元仿真(enhanced discrete element method,EDEM)软件构建油菜茎秆离散元模型,对模型的接触参数和粘结参数进行标定与优化。针对接触模型参数,依次通过Plackett-Burman试验、最陡爬坡试验和Box-Behnken试验,完成油菜中部茎秆仿真接触参数的标定,并得出其数学模型以及模型的一组最优解;针对粘结模型参数,先应用Plackett-Burman试验筛选出影响最大弯曲破坏力的显著因素,再通过二次回归正交组合试验,找出二次回归方程,借助优化求解工具,求出显著因素的最优参数组合。结果表明:在接触模型中,茎秆剪切模量、茎秆-钢板的静摩擦系数和茎秆-茎秆的静摩擦系数对接触模型影响显著(P<0.05),分别为17.251 MPa、0.353、0.383,在优化的参数下堆积角仿真值与实际堆积角相对误差为0.36%;在粘结模型中,单位面积法向接触刚度、单位面积切向接触刚度对粘结模型影响显著,分别为1.89×10^(10)、1.54×10^(10) N/m^(3),在优化的参数下弯曲仿真试验表现与实际试验表现一致,最大弯曲破坏力仿真值与实际值相对误差为0.47%,可较好表现适收期油菜茎秆受击打而弯曲折断的力学特性,该研究可为优化油菜联合收获机脱粒装置的结构参数和研究油菜收获过程等研究提供一定的理论基础。Accurate and reliable contact and bonding parameters can greatly contribute to the simulations of rapeseed threshing during combined harvesting.In this study,a discrete element model of rapeseed stems was constructed to facilitate the calibration and optimization of the contact and bonding parameters using EDEM software.Initially,the contact model parameters were refined.A Plackett-Burman test was employed to identify the significant influencing factors on the bulk density angle of rapeseed stems.Multiple factors were determined to clarify the most substantial impact on the outcome.After that,the steepest ascent test was used to explore the best ranges for these parameters.The iterative approach was used to narrow down the parameter values for the best simulation.Furthermore,the Box-Behnken test was conducted to fine-tune the calibration of the contact parameters for the middle portion of the rapeseed stem using the response surface method.The parameters were also optimized to explore the interactions among the variables and their effects on the simulation.As such,mathematical equations were derived to integrate the experimental indicators into factors.An optimal set of parameter values was determined to validate their accuracy and reliability using additional experiments.The parameters of the bonding model were also determined as the most influential factors in the maximum bending failure force.A Plackett-Burman test was also applied to identify the key influencing parameters on the bonding characteristics of rapeseed stems.Subsequently,a quadratic regression orthogonal combination test was employed to derive a quadratic regression equation,particularly with the relationship between the significant factors and the bending failure force.The best combination of parameters was then identified for the bonding model.The most accurate simulation was achieved using the optimal parameters.The results reveal that three parameters:stem shear modulus,the static friction coefficient between the stem and the steel plate,and

关 键 词：油菜 参数标定 离散元 粘结模型 联合收获 

分 类 号：S225.31[农业科学—农业机械化工程]