基于最优空间的猕猴桃双臂并行采摘平台设计与试验
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国家自然科学基金项目(31971805)


Design and Experiment of Dual Manipulators Parallel Harvesting Platform for Kiwifruit Based on Optimal Space
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    摘要:

    为使多关节双臂并行采摘空间与猕猴桃棚架空间相适应,以保证双臂间采摘区域连续无漏果且采摘面积最大化,采用理论与试验相结合的方法对双臂并行采摘平台进行设计。首先,结合机械手工作空间和棚架空间等效模型,分析确定了双臂空间布局方案;然后,通过对双臂并行采摘效率进行理论分析确定优化设计变量,以采摘面积最大和公共区域占比最小为指标建立目标优化函数,利用粒子群算法求解得最优双臂相对安装位置870mm、最优双臂安装高度1020mm和移动平台最大间歇式前进步距450mm;在此基础上,建立了双臂开链运动模型及其位置层约束关系;最后,为验证采摘空间适应性及整机作业性能,搭建双臂并行采摘平台样机并进行了果实定位误差试验和双臂并行采摘试验。结果表明:果实平均水平和深度定位误差分别为5.0mm和8.3mm,基本满足猕猴桃采摘要求,平均果实位置遍历成功率为92.09%,双臂能够遍历除奇异点外所要求的目标果实点,平均果实采摘成功率为82.10%,平均单果采摘时间为5.86s,通过位姿调整双臂在共享空间可以改善运动冲突问题,验证了猕猴桃双臂并行采摘平台的作业可行性。

    Abstract:

    In order to adapt the parallel harvesting space of the multi-joint dual robotic arms to the kiwifruit scaffolding space, so that ensuring the maximum continuous harvesting area without fruit leakage, the method of theory and experiment was used to design the parallel harvesting platform of the dual robotic arms. Firstly, the spatial layout of the dual robotic arms was determined by combining the equivalent models of the manipulator workspace and the scaffolding space. Then, the design variables were determined by theoretical analysis of the parallel harvesting efficiency with the dual robotic arms, and the objective optimization function was established with the indicators of “maximum harvesting area” and “minimum common area”. A particle swarm algorithm was used to solve for an optimum relative mounting position of 870mm, an optimum mounting height of 1020mm for the dual robotic arms, and a maximum intermittent forward step distance of 450mm for the mobile platform. On this basis, the open-chain motion model of the arms and their position layer constraints was established. Finally, to verify the adaptability of the parallel harvesting space and the performance of the whole machine, a prototype of the dual manipulators parallel harvesting platform was built and the fruit positioning error test and the parallel harvesting test with dual robotic arms were carried out. The results showed that the average horizontal and depth positioning errors of the fruit were 5.0mm and 8.3mm respectively, which met the kiwifruit picking requirements, the average fruit position traversal success rate was 92.09%, the arms can traverse the required target fruit points except singular points, the average fruit harvesting success rate was 82.10% and the average single fruit harvesting time was 5.86s, the problem of motion conflict can be improved by adjusting the pose of the arms in the shared space, which verified the operational feasibility of the parallel harvesting platform with dual robotic arms for kiwifruit.

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崔永杰,马利,何智,朱玉桃,王寅初,李凯.基于最优空间的猕猴桃双臂并行采摘平台设计与试验[J].农业机械学报,2022,53(8):132-143. CUI Yongjie, MA Li, HE Zhi, ZHU Yutao, WANG Yinchu, LI Kai. Design and Experiment of Dual Manipulators Parallel Harvesting Platform for Kiwifruit Based on Optimal Space[J]. Transactions of the Chinese Society for Agricultural Machinery,2022,53(8):132-143.

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  • 收稿日期:2022-03-30
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  • 在线发布日期: 2022-05-24
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