One of the critical barriers for whole-stalk sugarcane mechanical harvesting is the high proportion of impurities especially in the cane tops. In this study, a whole-stalk sugarcane conveying and top breaking system was developed and tested to improve top breaking performance. Effects of feeding roller speed, top breaking roller speed, stagger angle of upper and lower top breaking elements and distance between the upper and lower top breaking element on sugarcane top breaking rate, non-fracture rate and power requirement were explored. Central composite design combined with response surface method was employed to conduct experiments and explore the interaction effects of influence factors on indicators. The optimal structure and operating parameters were determined to be 305 rpm for feeding roller speed, 520 rpm for top breaking roller speed, 14° for the stagger angle and 10 mm for the distance. The predicted values for top breaking rate, non-fracture rate and power requirement were 85%, 83% and 690 W, respectively. Verification experiments demonstrated that the observed values were in agreement with the predicted values. Based on the optimised results, a rigid-flexible coupling model was established for sugarcane conveying and top breaking and the simulation results showed that the model was reliable in predicting the kinetic characteristics of sugarcane in conveying and top breaking processes. The maximum resultant striking force of the top breaking elements on the cane stalk was 807.68 N. Overall, the conveying and top breaking system developed in this study was effective for improving top cleaning performance in whole-stalk sugarcane harvesting.

中文翻译：

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整杆甘蔗收割机输送破顶系统优化与动态仿真

整茎甘蔗机械收获的关键障碍之一是高比例的杂质，尤其是甘蔗顶部的杂质。在这项研究中，开发并测试了一种整茎甘蔗输送和断顶系统，以提高断顶性能。探讨了喂料辊转速、破顶辊速度、上下破顶元件错开角度和上下顶破元件间距对甘蔗破顶率、不断裂率和功率需求的影响。采用中心复合设计结合响应面法进行实验，探讨影响因素对指标的交互作用。最佳结构和运行参数确定为进料辊转速305 rpm，顶部破碎辊转速520 rpm，交错角为 14°，距离为 10 毫米。顶部断裂率、非断裂率和功率需求的预测值分别为 85%、83% 和 690 W。验证实验表明，观测值与预测值一致。在优化结果的基础上，建立了甘蔗输送和破顶的刚柔耦合模型，仿真结果表明该模型能够可靠地预测甘蔗在输送和破顶过程中的动力学特性。顶部破碎元件在甘蔗茎上的最大撞击力为 807.68 N。总的来说，本研究开发的输送和顶部破碎系统对于提高整茎甘蔗收获的顶部清洁性能是有效的。