多末端苹果采摘机器人机械手运动学分析与试验
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国家高技术研究发展计划(863计划)项目(2006AA10Z259)、江苏省自然科学基金项目(BK20140720)和中央高校基本科研业务费专项资金项目(KYZ201325)


Kinematics Analysis and Experiment of Apple Harvesting Robot Manipulator with Multiple End-effectors
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    摘要:

    提出了一种多末端采摘机器人机械手结构方案,设计了机械臂、末端执行器及其控制系统。机器人机械臂采用主从两级结构,从臂前端可挂接多个末端执行器。末端执行器能进行果实连续采摘,其结构紧凑、驱动简单、通用性好,可适用于苹果、柑橘、梨等球形水果的自动化收获。针对设计的采摘机械手具有多末端的特点,提出了果树分区采摘作业策略,一个采摘区内各个末端执行器同时连续采摘、果实集中回收。在此基础上建立了机器人机械手运动学模型,采用D—H法推导了运动学方程,运用Matlab Robotics Toolbox进行了运动学仿真验证。制作了机械手物理样机并在实验室环境下进行了机械手运动学及采摘试验,结果表明,机械手各从臂末端位置误差小于9mm,采摘成功率为82.14%。

    Abstract:

    In order to solve the problem of low picking efficiency of single end-effector apple harvesting robot, a structure scheme of multiple end-effectors manipulator was proposed. The mechanical arm, end-effector and manipulator control system were designed. Master-slave two-grade structure was used in the mechanical arm, the multiple end-effectors were linked to forepart of the robot slave mechanical arm, and could operate continuously and simultaneously. The end-effector of the robot had advantages of compact structure and simple drive, which could absorb position error of mechanical arm, and it was universal and suitable for apple, citrus, pears and other spherical fruits picking. According to the characteristics of manipulator with multiple end-effectors, a partitioned fruit tree picking operation strategy was formulated, all the end-effectors picked the target fruits of a picking partition continuously and simultaneously, and the fruits were centrally collected. On this basis, the kinematics mode for robot manipulator was established, the kinematics equations were derived based on the D—H method. The kinematics simulation of the manipulator was conducted using Matlab Robotics Toolbox, the simulation results showed that the kinematics analysis was entirely correct. Based on these, the manipulator physical prototype was manufactured, and the manipulator kinematics and end-effectors picking experiments were carried out under laboratory environment. The results showed that the picking operation strategy was reasonable and feasible, the position error of manipulator end was less than 9mm, and the picking success rate could reach 82.14%.

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李国利,姬长英,顾宝兴,徐伟悦,董芒.多末端苹果采摘机器人机械手运动学分析与试验[J].农业机械学报,2016,47(12):14-21,29. Li Guoli, Ji Changying, Gu Baoxing, Xu Weiyue, Dong Mang. Kinematics Analysis and Experiment of Apple Harvesting Robot Manipulator with Multiple End-effectors[J]. Transactions of the Chinese Society for Agricultural Machinery,2016,47(12):14-21,29.

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  • 收稿日期:2016-04-26
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  • 在线发布日期: 2016-12-10
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