Authors

Abstract

Reducing potato tuber injury rate is responsible for optimal design of potato harvester , one of the most important goals.To assess the influence of various factors on potato tubers impact damage，the physical model of potato tuber collision was constructed in terms of the deformation and deformation energy analysis during the collision. Secondly, the orthogonal trial was conducted.the impact material, potato varieties,potential energy,impact angle were selected as factors,meanwhile,the comprehensive damage index(DI) was taken as the evaluation index.The results showed that the damage degree of potato tuber decreases with the reduction of impact material hardness, potential energy, and collision angle.When the impact material is a plank, the potential energy is 1.2j, the type of potato is Lishu 6, and the collision angle is 0 °，the comprehensive damage index is the lowest, 0.0055.According to the result of orthogonal test, the regression mathematical model was obtained.At the same time,verification tests were performed.The results of verification tests showed that the average error between the predicted data of the comprehensive damage index that was calculated by the regression mathematical model and the experimental data was 5.22%.

Abstract in Chinese

降低马铃薯块茎损伤率是马铃薯收获机优化设计过程中的主要目标之一，为了评估各因素对马铃薯块茎碰撞损伤的影响，本文从马铃薯碰撞变形量和变形能两方面进行分析，构建了马铃薯块茎碰撞物理模型，选取碰撞材料、马铃薯品种、马铃薯重力势能和碰撞角度作为试验因素，以马铃薯损伤综合指数（DI）作为评价指标开展了正交试验，结果表明：碰撞材料越软、马铃薯势能越小、碰撞角度越小，马铃薯的碰撞损伤越小。当碰撞材料为木板、马铃薯种类为丽薯6号、马铃薯势能为1.2J、碰撞角度为0°时，马铃薯损伤综合指数最小为0.0055。根据正交试验结果得到了马铃薯损伤综合指数的回归模型并进行了验证试验，试验结果显示：回归模型对马铃薯损伤综合指数的预测值与实际测量值相比平均误差为5.22%。