Discrete element modeling and parameter calibration of safflower biomechanical properties  

作　　者：Zhenguo Zhang Chao Zeng Zhenyu Xing Peng Xu Quanfeng Guo Ruimeng Shi Yunze Wang 

机构地区：[1]College of Mechanical and Electrical Engineering,Xinjiang Agricultural University,Urumqi 830052,China [2]Key Laboratory of Xinjiang Intelligent Agricultural Equipment,Xinjiang Agricultural University,Urumqi 830052,China

出　　处：《International Journal of Agricultural and Biological Engineering》2024年第2期37-46,共10页国际农业与生物工程学报（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52265041 and 31901417);the assistance provided by the Xinjiang Key Laboratory of Intelligent Agricultural Equipment.

摘　　要：Understanding the biomechanical properties of safflowers is essential for appropriately designing harvesting machinery and optimizing the harvesting process.Safflower is a flexible crop that lacks a basis for relevant simulation parameters,which causes difficulties in designing harvesting machinery.In this study,a calibration method for safflowers was proposed.First,a discrete element model was established by measuring the intrinsic parameters of a safflower,such as its geometric parameters,density,Poisson’s ratio,and modulus of elasticity.Second,the contact and bonding parameters were calibrated using a combination of physical and simulation tests.In the contact parameter tests,the Hertz-Mindlin(no-slip)model was implemented for the stacking angle tests conducted regarding the safflower filament.A regular two-level factorial design was used to determine the important factors and perform the steepest climb test.Moreover,the Box-Behnken design was adopted to obtain the optimal contact parameters.In the bonding parameter tests,the Hertz-Mindlin model with bonding contact was applied for the safflower shear simulation tests;moreover,the optimum bonding parameters were obtained through the central composite design test.The results demonstrated that the relative errors between the simulated and measured stacking angles and maximum shear were 3.19%and 5.29%,respectively.As a result,the safflower simulation parameters were accurately calibrated,providing a reference for appropriately setting the simulation parameters and designing key mechanical components.

关 键 词：SAFFLOWER DEM parameter calibration shear test biomechanical properties 

分 类 号：S18[农业科学—农业基础科学]