农业机械学报2024，Vol.55Issue(1)：76-84,108,10.DOI:10.6041/j.issn.1000-1298.2024.01.007
新疆棉花秸秆离散元仿真参数标定研究
Discrete Element Simulation Parameters Calibration for Xinjiang Cotton Straw
摘要
Abstract
Due to the lack of accurate simulation model parameters in the process of mechanized harvesting and crushing of cotton straw,there is a great difference between the simulation effect and the actual operation in the design of machinery and tools,which limits the design and research of cotton straw harvesting and crushing device to a certain extent.Xinjiang cotton straw was used as experimental material to carry out simulation analysis.After the intrinsic parameters of cotton straw were determined by physical tests,the EDEM simulation software was used for test simulation and parameter calibration of cotton straw.The accumulation angle and the maximum destructive power of cotton straw were 28.62°and 143.21 N respectively by the method of accumulation angle test and bending test.The Hertz-Mindlin no slip model and Hertz-Mindlin with bonding model were used to simulate the stacking angle and bending of cotton straw.The collision recovery coefficient,static friction coefficient and rolling friction coefficient between cotton straw and the collision recovery coefficient,static friction coefficient and rolling friction coefficient between cotton straw and steel were respectively 0.5,0.41,0.06,0.5,0.37 and 0.08,and the normal contact stiffness,tangential contact stiffness,critical normal stress and critical tangential stress of cotton straw were respectively obtained,which were 4.15×1010 N/m,5.60 ×1010 N/m,40 MPa and 50 MPa,respectively.According to the above results,the pulverized cotton straw can be divided into powder type material,crushed type material and unbroken type material according to different lengths and widths.The deviation between the simulation test quality and the actual test quality was 6.84％,8.29％and 7.37％,which proved the feasibility of the parameters and can be used for the parameter calibration of cotton straw.关键词
棉花秸秆/堆积角试验/弯曲试验/离散元/参数标定Key words
cotton straw/accumulation angle test/bending test/EDEM/parameter calibration分类
农业科技引用本文复制引用
张佳喜,张彭,张虎,谭春林,万文瑜,王毅超..新疆棉花秸秆离散元仿真参数标定研究[J].农业机械学报,2024,55(1):76-84,108,10.基金项目
国家自然科学基金项目(52365038、51865058)、新疆维吾尔自治区农机研发制造推广应用一体化项目(YTHSD2022-09)和新疆维吾尔自治区重点研发计划项目(2022B02022-2) （52365038、51865058）
