果荚初期饲料油菜茎秆离散元接触模型参数标定
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国家自然科学基金项目(52075210)、中央高校基本科研业务费专项资金项目(2662018JC005)、国家油菜产业技术体系专项(CARS-12)、农业农村部科研杰出人才与创新团队项目和湖北省自然科学基金项目(2018CFB343)


Calibration of Discrete Element Model Parameters of Forage Rape Stalk at Early Pod Stage
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    摘要:

    针对饲料油菜与不同材料的接触参数实测难度大、机械化收获离散元仿真模拟缺乏接触模型参数的问题,以果荚初期饲料油菜为对象,基于EDEM开展了饲料油菜茎秆颗粒离散元接触模型参数标定。测定了果荚初期饲用油菜茎秆本征参数,茎秆平均直径为20.4mm,密度为809kg/m3,茎秆弹性模量、剪切模量和泊松比平均值分别为115.73MPa、47.04MPa和0.23;以休止角为评价指标,应用Hertz-Mindlin基本模型和圆筒提升堆积法开展了饲料油菜茎秆颗粒堆积的虚拟二水平因子试验,结果表明饲料油菜茎秆与钢之间的碰撞恢复系数和滚动摩擦因数以及茎秆之间的碰撞恢复系数对休止角的影响较小,其值分别为0.60、0.10和0.60;通过最陡爬坡试验和响应面分析,确定了饲料油菜茎秆颗粒间静摩擦因数、滚动摩擦因数和饲料油菜茎秆-钢静摩擦因数的取值范围,建立了颗粒休止角的回归模型,以实测休止角与仿真试验休止角之间相对误差最小进行响应面分析和优化求解,确定其参数值分别为0.36、0.03和0.23。在接触参数最优组合条件下,根据回归模型计算得出的休止角理论值与实测值误差为2.15%,仿真试验得出休止角模拟值与实测值误差为1.83%,表明标定方法正确,标定参数准确。研究可为饲料油菜机械化收获过程的离散元仿真分析提供基本参数。

    Abstract:

    Existing development using virtual simulation technology for the fodder rape crop harvest technology and machine lacks accurate model parameters, highlighting a need for the calibration. Taking the rape crop stalk at the early pod stage as the object, the parameters calibration was carried out by using EDEM software. The basic attribute of the stem, including the repose angle, were measured. The results indicated that the average stalk diameter was 20.4mm, the density was 809kg/m3, and the average elastic modulus, shear modulus and Poisson’s ratio were 115.73MPa, 47.04MPa and 0.23, respectively. Furthermore, the Hertz-Mindlin contact mode was employed to conduct a cylindrical lifting simulation test, in which the contact mode used different parameter sets according to the test design rule of two-level factor test, steepest climbing test, and response surface analysis. The results showed that the recovery coefficient of the collision of particles of crop stem, the recovery coefficient of the collision between steel and particles of crop stem and the rolling friction coefficient between steel and particles of crop stem had slight effect on the angle of repose, whose values were determined as 0.60, 0.60 and 0.10, respectively. The static friction coefficient of particles of crop stem, the coefficient of rolling friction of particles of crop stem, and the static friction coefficient between steel and particles of crop stem were identified as 0.36, 0.03, and 0.23, respectively. The error rate of the value of repose angle between the simulated by using EDEM with the calibrated parameters and the real measured value was 1.83%. The research provided the basic parameters for the simulation of the fodder rape crop mechanized harvest.

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廖宜涛,王在腾,廖庆喜,万星宇,周宇,梁方.果荚初期饲料油菜茎秆离散元接触模型参数标定[J].农业机械学报,2020,51(s1):236-243. LIAO Yitao, WANG Zaiteng, LIAO Qingxi, WAN Xingyu, ZHOU Yu, LIANG Fang. Calibration of Discrete Element Model Parameters of Forage Rape Stalk at Early Pod Stage[J]. Transactions of the Chinese Society for Agricultural Machinery,2020,51(s1):236-243.

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  • 收稿日期:2020-08-10
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  • 在线发布日期: 2020-11-10
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