Discrete element modeling and verification of the simulation parameters for chopped hybrid Broussonetia papyrifera stems  

作　　者：Caiwang Peng Junwei Chen Xi He Songlin Sun Yulong Yin Zhong Chen 

机构地区：[1]College of Mechanical and Electrical Engineering,Hunan Agricultural University,Changsha 410128,China [2]College of Animal Science and Technology,Hunan Agricultural University,Changsha 410128,China [3]Rongcheng Gouyang Modern Agriculture(Chongqing)Co.,Ltd,Chongqing 500153,China

出　　处：《International Journal of Agricultural and Biological Engineering》2024年第1期23-32,共10页国际农业与生物工程学报（英文）

基　　金：the Natural Science Foundation of Hunan Province,China(Grant No.2023JJ30310);Scientific Research Fund of Hunan Provincial Education Department(Grant No.22A0169).

摘　　要：In this study,the discrete element software EDEM was applied to establish a simulation model of non-uniform-sized particle units for Broussonetia papyrifera stalks,which aimed to address the low utilization rate of existing Broussonetia papyrifera harvesting machinery,the significant variation between the simulated model of Broussonetia papyrifera stalks and their actual appearance,as well as the absence of contact parameter calibration.Through a combination of the free-fall collision method,inclined plane sliding method,and inclined plane rolling method,numerical simulation was conducted to analyze the pattern of variations in contact parameters between Broussonetia papyrifera stalks and the steel material of the machinery.Accordingly,these parameters were calibrated.The results showed that the coefficient of restitution between Broussonetia papyrifera stalks and steel materials was 0.321,the static friction factor was 0.589,and the rolling friction factor was 0.078.With the parameters of contact between Broussonetia papyrifera stalks as variables and the experimentally measured pile angle as the objective of optimization,the steepest ascent experiment and the three-factor five-level rotation combination experiment were conducted.In this way,a second-order response model was constructed to analyze the relationship between the contact parameters and the pile angle.Through the optimization analysis of experimental data,it was determined that the coefficient of restitution between Broussonetia papyrifera stalks was 0.21,the static friction factor was 0.24,and the rolling friction factor was 0.03.Furthermore,the calibration results were validated through experimentation to show that the relative error between the obtained pile angle under the context of optimal parameter combination and the actual one was 4.11%.In addition,the relative error of mass flow rate in spiral transport was within a reasonable range,this study lays a foundation both theoretically and statistically for the simulation of contact parameters fo

关 键 词：hybrid Broussonetia papyrifera stem discrete element method repose angle contact parameters CALIBRATION 

分 类 号：Q81[生物学—生物工程]