农业机械学报2024，Vol.55Issue(5)：87-97,11.DOI:10.6041/j.issn.1000-1298.2024.05.008
基于单轴密闭压缩试验的草炭离散元参数标定
Calibration of Peat Discrete Element Parameters Based on Uniaxial Closed Compression Test
摘要
Abstract
To enhance the accuracy of simulating charcoal loading,hole pressing,and overlaying in the hole tray seeding process,based on the material properties of charcoal,the Edinburgh Elasto-Plastic Adhesion(EEPA)model was selected to establish a discrete element simulation model of charcoal in EDEM software.The peat parameters were calibrated through shaft-closed compression and virtual simulation tests,while the density,particle size distribution,and contact parameters of peat were measured through physical experiments.Significance analysis experiments were designed by using Plackett-Burman Design and the steepest climbing test to determine the restitution coefficient,static friction coefficient,tangential stiffness factor,and shear of peat,with modulus having a significant effect.A quadratic polynomial regression model was established between the response value and four significant parameters using the central composite design test.The axial pressures of 3.83 N and 91.45 N corresponding to the uniaxial closed compression of 20％and 50％axial strain were used as target values for testing the significant parameters.After optimization,the optimal combination was determined to be a recovery coefficient of 0.202 between peat plants,a static friction coefficient of 0.595 between peat plants,a tangential stiffness factor of 0.667,and a peat shear modulus of 0.613 MPa.Finally,the simulated values and the measured values under this parameter combination were compared and verified.The average error between the measured values and the simulated values in the axial strain range of 20％to 50％was approximately 8.08％,with the relative error reaching the maximum value of 15.34％at about 40％of axial strain.These results demonstrated that the EEPA model parameters calibrated based on the response surface method can be used for discrete element simulation research.关键词
草炭/单轴密闭压缩/离散元/轴向压力/参数标定Key words
peat/uniaxial closed compression/discrete element method/axial pressure/parameter calibration分类
农业科技引用本文复制引用
王斌斌,何智,丁辛亭,郝伟,杨珍,崔永杰..基于单轴密闭压缩试验的草炭离散元参数标定[J].农业机械学报,2024,55(5):87-97,11.基金项目
陕西省重点研发计划项目(2019ZDLNY02-04) （2019ZDLNY02-04）
