筒仓中油菜籽堆高安全域的研究
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摘要
建立筒仓中油菜籽分层压缩平衡微分方程,实验测定微分方程中的参数,得到筒仓内不同深度油菜籽堆应力分布;建立筒仓中油菜籽籽粒堆放模型,给出筒仓内不同深度油菜籽的应力与籽粒压力的关系;设定油菜籽籽粒产生0. 5%的塑性应变为籽粒损伤阈值,结合筒仓内不同深度油菜籽堆应力分布以及籽粒受力与应变,给出油菜籽的堆高安全域。数值计算结果表明:油菜籽含水率为7.11%～13.52%w.b.时,半径为10 m的筒仓内油菜籽堆高安全域为22.00～45.59 m,半径为15 m的筒仓内油菜籽堆高安全域为19.78～35.97 m,半径为20 m的筒仓内油菜籽堆高安全域为18. 87～32. 76 m;筒仓内油菜籽的堆高安全域随着含水率的增大而减小,随着筒仓半径的增大而减小。
The hierarchical compression equilibrium differential equation of rapeseed in silos was established and the relevant parameters of the equations were determined, so the stress distribution of rapeseed heap in different depths of silo can be calculated; rapeseed heap stacking model in silos was established to determine the relationship between rapeseed heap stress and seed stress in different depths; it was defined that rapeseed seed was damaged when it was produced 0.5% plastic strain. Combining the stress distribution of rapeseed heap in different depths in the silo,and the stress and strain of rapeseed seed, the security domain of rapeseed heap height was calculated. The numerical results showed that when the moisture content of rapeseed ranged from 7.11% to 13.52%, the security domain of rapeseed height in silo with a radius of 10 m ranged from 22. 00 to 45.59 m, a radius of 15 m ranged from19. 78 to 35. 97 m, and a radius of 20 m ranged from 18. 87 to 32. 76 m; the security domain of rapeseed height in the silo was decreased with the increasing moisture content and the silo radius.
The hierarchical compression equilibrium differential equation of rapeseed in silos was established and the relevant parameters of the equations were determined, so the stress distribution of rapeseed heap in different depths of silo can be calculated; rapeseed heap stacking model in silos was established to determine the relationship between rapeseed heap stress and seed stress in different depths; it was defined that rapeseed seed was damaged when it was produced 0.5% plastic strain. Combining the stress distribution of rapeseed heap in different depths in the silo,and the stress and strain of rapeseed seed, the security domain of rapeseed heap height was calculated. The numerical results showed that when the moisture content of rapeseed ranged from 7.11% to 13.52%, the security domain of rapeseed height in silo with a radius of 10 m ranged from 22. 00 to 45.59 m, a radius of 15 m ranged from19. 78 to 35. 97 m, and a radius of 20 m ranged from 18. 87 to 32. 76 m; the security domain of rapeseed height in the silo was decreased with the increasing moisture content and the silo radius.
引文
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[2]谢奇珍,师建芳,刘进,等.油菜籽的储藏与管理[J].中国油脂,2007(2):57-60XIE Q Z, SHI J F, LIU J, et al. Storage and management of rapeseed[J]. China Oils and Fats, 2007(2):57-60
[3]沈玉君,李国学,任丽梅,等.通风对堆肥供氧的影响及堆高优化研究[J].环境科学与技术,2011,34(11):171-175SHEN Y J, LI G X, REN L M, et al. Impact of aeration on oxygen variation during composting and optimization on pile height[J]. Environmental Science&Technology, 2011, 34(11):171-175
[4]王剑,吴冬.关于斜坡型排土场堆高确定的研究[J].科技展望,2016,26(29):249-250WANG J, WU D. A Study on the determination of stack height in slope dumps[J]. Technology Outlook, 2016,26(29):249-250
[5]许东宾.激光水平仪在仓内测量粮堆高度的应用[J].粮油仓储科技通讯,2017,33(4):52-53XU D B. The application of laser level gauge to measure the height of grain reactor in warehouse[J]. Grain and oil stor-age technology communication, 2017,33(4):52-53
[6]程绪铎,高梦瑶,冯家畅,等.预测平房仓中小麦的密度分布与储藏质量模型[J].中国粮油学报,2017,32(3):96-102CHENG X D, GAO M Y, FENG J C, et al. Model of density distribution and storage quality of wheat in a horziontal warehouse[J]. Journal of Chinese Cereals and Oils Association, 2017,32(3):96-102
[7]唐福元,许倩,程绪铎.筒仓中稻谷的孔隙率分布研究[J].中国粮油学报,2017,32(12):111-116TAN F Y, XU Q, CHENG X D. Research on porosity distribution of paddy in silos[J]. Journal of Chinese Cereals and Oils Association, 2017,32(12):111-116
[8] CHENG X,ZHANG Q. A particulate model for predicting vibration-induced loads in bulk solids storage bins[J].Transactions of the ASABE. 2006, 49(3):759-765.