红枣挑抛捡拾过程中机械碰撞有限元分析
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摘要
为预测落地红枣在挑抛捡拾过程中机械碰撞情况下的损伤响应,对红枣挑抛捡拾过程的运动学特性进行分析,确定红枣的抛落高度是影响红枣机械损伤的主要因素;通过ANSYS软件建立红枣与挑果杆碰撞有限元模型,仿真分析了不同抛落高度下红枣与挑果杆的碰撞过程。结果表明:红枣与挑果杆碰撞区域中心处应力值最大,红枣内部Von Mises等效应力值和挑果杆碰撞产生的最大接触力随抛落高度的增加而逐渐增大;红枣与挑果杆碰撞,红枣与挑果杆的接触力达到临界破裂力的临界抛落高度为360 mm,结果可为红枣捡拾装置挑果机构的优化设计提供参考。
In order to predict the damage response of landing jujubes in the process of picking-up, the kinematics of pickingup and throwing jujubesis are analyzed. The falling height of the main factor affects mechanical damage of jujubes. The finite element model of jujube is established based on ANSYS software, and the process of jujube impacting picking mechanism is simulated with different drop heights. The simulation results show that the stress value at the center of the impacting area between jujube and picking mechanism is the largest. The Von Misesof jujubes and the maximum contact force caused by collision between force value and picking mechanism gradually increase with the increase of dropping height; The critical throwing height of the contact between jujube and picking mechanism reaching the critical rupture force is 360 mm. It can provide a reference for the optimal design of the picking mechanism of jujube picking device.
In order to predict the damage response of landing jujubes in the process of picking-up, the kinematics of pickingup and throwing jujubesis are analyzed. The falling height of the main factor affects mechanical damage of jujubes. The finite element model of jujube is established based on ANSYS software, and the process of jujube impacting picking mechanism is simulated with different drop heights. The simulation results show that the stress value at the center of the impacting area between jujube and picking mechanism is the largest. The Von Misesof jujubes and the maximum contact force caused by collision between force value and picking mechanism gradually increase with the increase of dropping height; The critical throwing height of the contact between jujube and picking mechanism reaching the critical rupture force is 360 mm. It can provide a reference for the optimal design of the picking mechanism of jujube picking device.
引文
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[3]付威,何荣,曲金丽,等.自走式矮化密植红枣收获机的设计[J].农机化研究,2014,36(4):106-109.
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[5]吴亚丽,郭玉明.果蔬生物力学性质的研究进展及应用[J].农产品加工(学刊),2009(3):34-37,49.
[6]KURSAT CELIK H.Determination of bruise susceptibility of pears(Ankara variety)to impact load by means of FEM-based explicit dynamics simulation[J].Postharvest Biology and Technology,2017:83-97.
[7]LU F,ISHIKAWA Y,KITAZAWA H,et al.Impact damage toapple fruits in comer-cial corrugated fiberboard boxpackaging evaluated by the pressure-sensitive film technique[J].Journal of Food Agriculture&Environment,2010,2(8):218-222.
[8]CELIK H K,KABAS O,TOPAKCI M,et al.Deformation behaviour simulation of a sample apple under the impact effect with finite elements method[J].Tenth International Congress on Mechanization and Energy in Agriculture,2008(14/17):893-898.
[9]徐立章,李耀明.稻谷与钉齿碰撞损伤的有限元分析[J].农业工程学报,2011,27(10):27-32.
[10]段以磊.辣椒机械采摘损伤机理及试验研究[D].石河子:石河子大学,2014.
[11]张亚欧.自走式矮化密植红枣收获机配套捡拾装置的研究[D].石河子:石河子大学,2016.
[12]宋慧芝,王俊,陈琦峰,等.梨动力学特性有限元分析[J].农业机械学报,2005(6):61-64.
[13]JAMAL N,YING Y B,WANG J P,et al.Finite element models of watermelon and their applications[J].Transactions of the Chinese Society of Agricultural Engineering(Transactions of the CSAE),2005,21(1):17-22.
[14]付威,何荣,坎杂,等.红枣力学特性的试验研究[J].石河子大学学报(自然科学版),2013,31(4):518-522.
[15]吴杰,郭康权,葛云,等.香梨果实跌落碰撞时的接触应力分布特性[J].农业工程学报,2012,28(1):250-254,300.
[16]刘鸿文.材料力学[M].北京:高等教育出版社,2004.