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针对CFD-DEM仿真过程中花生荚果与收获机械重要工作部件间的碰撞模型参数缺失问题,利用运动学方程原理设计了花生荚果恢复系数的测定装置,对花生荚果的弹性特性参数进行试验测定与分析。花生品种选用四粒红和白沙,采用L_(16)(4~4×2~3)混合正交试验方案研究碰撞材料、下落高度、荚果质量、含水率、品种、材料厚度等因素对花生荚果恢复系数的影响。结果显示:影响花生荚果恢复系数的因素主次顺序为,碰撞材料、荚果质量、含水率、下落高度、材料厚度和花生品种,碰撞材料、荚果质量及含水率较为显著。花生荚果恢复系数随Q235、铝合金、有机玻璃、橡胶等材料依次减小,并随着荚果质量和含水率的增加而递减。碰撞材料为Q235(厚1mm)、含水率为17.5%的白沙、下落高度为100cm、荚果质量为1.3g时恢复系数达到最大值为0.426 7;在相同条件下选用质量为2.5g含水率为8.3%的荚果时恢复系数达到最大值0.390 9。该研究可为花生收获机械的参数设计及优化提供参考依据。
In order to solve the problem of the missing model of the collision model between peanut pod and important working parts of CFD-DEM simulation process, the measuring device of peanut pod recovery coefficient was designed by kinematic equation principle, and the elastic properties of peanut pod were tested and analyzed . Peanut varieties were selected with four red and white sand. The effects of colliding material, drop height, pod quality, water content, variety, material thickness and other factors on the peanut pod Effect of recovery factor. The results showed that the main order of the factors affecting the recovery coefficient of peanut pod was collision material, pod quality, water cut, height, material thickness and peanut variety, collision material, pod quality and water content. The recovery coefficient of peanut pod decreased with the materials of Q235, aluminum alloy, plexiglass, rubber and so on, and decreased with the increase of pod quality and moisture content. The collision material is Q235 (thickness 1mm), white sand with water content of 17.5%, height of drop of 100cm and maximum recovery coefficient of 0.426 7 when the mass of pod is 1.3g. Under the same conditions, the moisture content of 2.5g is 8.3 The recovery coefficient of pod reached the maximum of 0.390 9%. This research can provide a reference for the design and optimization of peanut harvesting machinery parameters.