Establishment of Discrete Element Model and Parameter Calibration of Alfalfa Stem in Budding Stage
Abstract
In view of lack of accurate models for discrete element simulation in the current research and development process of forage harvesting, crushing, processing equipment transportation and cutting, the alfalfa budding stem with high moisture content and complex physical and mechanical characteristics was taken as the research object. With the aid of EDEM simulation software, the physical parameters and bonding parameters were calibrated based on Hertz-Mindlin (no slip) and Hertz-Mindlin with bonding contact models respectively. Based on angle of repose and shear test, physical parameters such as Poisson’s ratio, shear modulus, impact recovery coefficient, static friction coefficient, rolling friction coefficient and bonding parameters such as normal contact stiffness, tangential contact stiffness, critical normal stress, critical tangential stress and bonding radius of alfalfa stem were determined through Plackett-Burman test, the Steepest ascent test and Box-Behnken test. The relative error between the simulated angle of repose and the physical angle of repose was 0.52%. The results showed that the relative error between the simulated shear failure force and the physical test simulation failure force was 0.86%, which indicated that the calibrated parameters can truly reflect the physical and mechanical characteristics of alfalfa stems at the budding stage. It provided a reliable model and parameter calibration method for the discrete element simulation in the research and development process of forage machinery, and also provided a reference for the research and development, optimization design and power matching of the conveying and cutting mechanisms of forage harvesting and crushing processing equipment.
Keywords: forage grass, alfalfa stem angle of repose, shear crushing, discrete element, parameter calibration
Download Full Text:
PDFReferences
WU Kun, SONG Yuepeng. Research progress analysis of crop stalk cutting theory and method [ J ]. Transactions of the Chinese Society for Agricultural Machinery ,2022 ,53 ( 6 ) :1 -20. (in Chinese)
ZENG Zhiwei,MA Xu,CA0 Xiulong,et al. Critical review of applications of discrete element method in agricultural engineering [J ]. Transactions of the Chinese Society for Agricultural Machinery ,2021 ,52(4) ;1 -20. (in Chinese)
NGUYEN T X, LE L M , NGUYEN T C, et al. Characterization of soybeans and calibration of their DEM input parameters[ J]. Particulate Science and Technology, 2020,208:1 - 19.
MOUSAVIRAAD M, TEKESTE M Z, ROSENTRATER К A. Calibration and validation of a discrete element model of corn using grain flow simulation in a commercial screw grain auger[J]. Transactions of the ASABE, 2017,60(4) : 1403 - 1415.
JALAL K, JOANNA W, HEM AN R, et al. Modelling and simulation of fruit drop tests by discrete element method [ J ]. Biosystems Engineering,2021 ,212:228 -240.
LIAO Yitao,LIAO Qingxi,ZI10U Yu,et al. Parameters calibration of discrete element model of fodder rape crop harvest in bolting stage[ J ]. Transactions of the Chinese Society for Agricultural Machinery ,2020 ,5 1 ( 6 ) :73 -82. (in Chinese)
SONG Zhanhua,LI Hao,YAN Yinfa,et al. Calibration method of contact characteristic parameters of soil in mulberry field based on unequal-diameter particles DEM theory [ J ]. Transactions of the Chinese Society for Agricultural Machinery, 2022 ,53 ( 6 ) : 21 - 33. (in Chinese)
ZHANG Shengwei,ZHANG Ruiyu.CHEN Tianyou,et al. Calibration of simulation parameters of mung bean seeds using discrete element method and verification of seed-metering test[ J ]. Transactions of the Chinese Society for Agricultural Machinery ,2022, 53(3) :71 -79. (in Chinese)
WANG Decheng,HE Changbin,WU Hongjian,et al. Review of alfalfa full-mechanized production technology [J] .Transactions of the Chinese Society for Agricultural Machinery ,2017 ,48 (8 ) :1 -25. (in Chinese)
MA Wenpeng, YOU Yong, WANG Decheng,et al. Design and experiment of low-resistance soil loosening shovel for cutting roots and reseeding in perennial alfalfa field [ J] . Transactions of the Chinese Society for Agricultural Machinery ,202 1 ,52(2) :86 - 95,144. (in Chinese)
LIANG Haijun, WANG Tao, QIN Guixin. On the development of China’s alfalfa industryfj]. China Feed, 2014 ( 18) : 38 - 41. (in Chinese)
HOU Zhanfeng, DAI Nianzu, CHEN Zhi, et al. Measurement of physical parameters of Agropyron seeds and parameter calibration of discrete element simulation [ J ]. Transactions of the CSAE, 2020, 36(24) : 46 -54. (in Chinese)
LENAERTS B, AERTSEN T, TIJSKENS E, et al. Simulation of grain-straw separation by discrete element modeling with bendable straw particles[ J ]. Computers and Electronics in Agriculture,2014 ,101 : 24 -33.
PENG Caiwang,ZHOU Ting,SONG Shisheng,et al. Measurement and analysis of restitution coefficient of black soldier fly larvae in collision models based on Hertz contact theory [ J ]. Transactions of the Chinese Society for Agricultural Machinery, 2021 , 52 ( 1 1 ) ; 125 - 134. (in Chinese)
ZHANG Rongfang,JIAO Wei,ZHOU Jilei,et al. Parameter calibration and experiment of rice seeds discrete element model with different filling particle radius[ J ]. Transactions of the Chinese Society for Agricultural Machinery, 2020,51 ( Supp. 1 ) ; 227 - 235. (in Chinese)
WU Mengchen, CONG Jinling, YAN Qin, et al. Calibration and experiments for discrete element simulation parameters of peanut seed particles [ J ]. Transactions of the CSAE, 2020, 36(23) ; 30 -38. (in Chinese)
IIAO Jianjun, LONG Sifang, LI Hao, et al. Development of discrete element model and calibration of simulation parameters for mechanically-harvested yam[J]. Transactions of the CSAE, 2019, 35(20) ; 34 -42. (in Chinese)
LEBLICQ T, SMEETS B, RAMON H, et al. A discrete element approach for modelling the compression of crop stems[J]. Computers and Electronics in Agriculture, 2016, 123; 80 -88.
ZHANG Lixian. Study on discrete element modeling method for mechanical properties of corn stalk [D], Yangling: Northwest A&F University,2017. (in Chinese)
NIU Zhiyou,KONG Xianrui ,SHEN Bosheng,et al. Parameters calibration of discrete element simulation for pellet feed attrition [J ]. Transactions of the Chinese Society for Agricultural Machinery ,2022,53 ( 7) : 132 - 140,207. (in Chinese)
DU Xin,LIU Cailing, JIANG Meng,et al. Calibration of Bonding model parameters for coated fertilizers based on discrete element method [ J ]. Transactions of the Chinese Society for Agricultural Machinery ,2022 ,53 ( 7 ) : 141 - 149. (in Chinese)
Refbacks
- There are currently no refbacks.
