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果莢初期飼料油菜莖稈離散元接觸模型參數(shù)標(biāo)定
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國家自然科學(xué)基金項(xiàng)目(52075210)、中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(2662018JC005)、國家油菜產(chǎn)業(yè)技術(shù)體系專項(xiàng)(CARS-12)、農(nóng)業(yè)農(nóng)村部科研杰出人才與創(chuàng)新團(tuán)隊(duì)項(xiàng)目和湖北省自然科學(xué)基金項(xiàng)目(2018CFB343)


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

    針對(duì)飼料油菜與不同材料的接觸參數(shù)實(shí)測(cè)難度大、機(jī)械化收獲離散元仿真模擬缺乏接觸模型參數(shù)的問題,以果莢初期飼料油菜為對(duì)象,基于EDEM開展了飼料油菜莖稈顆粒離散元接觸模型參數(shù)標(biāo)定。測(cè)定了果莢初期飼用油菜莖稈本征參數(shù),莖稈平均直徑為20.4mm,密度為809kg/m3,莖稈彈性模量、剪切模量和泊松比平均值分別為115.73MPa、47.04MPa和0.23;以休止角為評(píng)價(jià)指標(biāo),應(yīng)用Hertz-Mindlin基本模型和圓筒提升堆積法開展了飼料油菜莖稈顆粒堆積的虛擬二水平因子試驗(yàn),結(jié)果表明飼料油菜莖稈與鋼之間的碰撞恢復(fù)系數(shù)和滾動(dòng)摩擦因數(shù)以及莖稈之間的碰撞恢復(fù)系數(shù)對(duì)休止角的影響較小,其值分別為0.60、0.10和0.60;通過最陡爬坡試驗(yàn)和響應(yīng)面分析,確定了飼料油菜莖稈顆粒間靜摩擦因數(shù)、滾動(dòng)摩擦因數(shù)和飼料油菜莖稈-鋼靜摩擦因數(shù)的取值范圍,建立了顆粒休止角的回歸模型,以實(shí)測(cè)休止角與仿真試驗(yàn)休止角之間相對(duì)誤差最小進(jìn)行響應(yīng)面分析和優(yōu)化求解,確定其參數(shù)值分別為0.36、0.03和0.23。在接觸參數(shù)最優(yōu)組合條件下,根據(jù)回歸模型計(jì)算得出的休止角理論值與實(shí)測(cè)值誤差為2.15%,仿真試驗(yàn)得出休止角模擬值與實(shí)測(cè)值誤差為1.83%,表明標(biāo)定方法正確,標(biāo)定參數(shù)準(zhǔn)確。研究可為飼料油菜機(jī)械化收獲過程的離散元仿真分析提供基本參數(shù)。

    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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廖宜濤,王在騰,廖慶喜,萬星宇,周宇,梁方.果莢初期飼料油菜莖稈離散元接觸模型參數(shù)標(biāo)定[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),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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  • 在線發(fā)布日期: 2020-11-10
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