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基于改進(jìn)人工勢場的蘋果采摘機器人機械手避障方法
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高等學(xué)校博士學(xué)科點專項科研基金資助項目(20093227120013)、江蘇省博士后基金資助項目(1102110C)和江蘇高校優(yōu)勢學(xué)科建設(shè)工程資助項目(蘇政辦發(fā)〔2011〕6號)


Obstacle Avoidance Method of Apple Harvesting Robot Manipulator
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    摘要:

    針對非結(jié)構(gòu)化環(huán)境下的采摘機器人機械手實時避障問題,,提出一種改進(jìn)人工勢場法的避障路徑規(guī)劃方法,。根據(jù)自行研制的5自由度蘋果采摘機器人機械手具體結(jié)構(gòu)和障礙物特征,進(jìn)行機械手運動學(xué)分析和障礙物建模,;在保留傳統(tǒng)人工勢場法易于實現(xiàn),、結(jié)構(gòu)簡單等優(yōu)點的基礎(chǔ)上,針對其存在的局部極小點,、陷進(jìn)區(qū)等問題,,結(jié)合果樹生長環(huán)境中障礙物的特點,通過引入虛擬目標(biāo)點使搜索過程跳出局部最優(yōu)的極小點,,從而實現(xiàn)機械手避開障礙物到達(dá)目標(biāo)的靈活避障,;將該方法應(yīng)用于機械手末端位置、障礙物位置和目標(biāo)位置已知條件下的采摘機器人機械手實時避障任務(wù)中,,仿真和實驗研究結(jié)果表明此方法簡單,,實時性好,,能夠有效地避開障礙物,成功到達(dá)目標(biāo)位置,,適合自然生長狀態(tài)下蘋果的自動采摘,。

    Abstract:

    For the problem of real-time path optimization for picking robot manipulator, an improved artificial potential field method was presented for apple picking robot manipulator to avoid obstacle under unstructured environment. According to the concrete structural characteristics of 5-DOF apple picking robot manipulator and obstacle, the manipulator model and obstacle model were analyzed. On the basis of retaining the merits of the traditional artificial potential field method which had simple structure and easy implement, for some of the shortcomings of its existence, such as local minimum points, the stuck district, combined with the characteristics of obstacles in the apple growing environment, a virtual target point was introduced to help the search process escape local optimal minimum point and obtain an optimization smooth motion curve. This method was applied in the obstacle avoidance path planning experiment for the apple picking robot manipulator, which included end-effector, obstacle and targets position. The experimental result showed that the proposed method was simple and enabled to overcome the shortcoming of traditional artificial potential field method.

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姬 偉,程風(fēng)儀,趙德安,陶 云,丁世宏,呂繼東.基于改進(jìn)人工勢場的蘋果采摘機器人機械手避障方法[J].農(nóng)業(yè)機械學(xué)報,2013,44(11):253-259. Ji Wei, Cheng Fengyi, Zhao Dean, Tao Yun, Ding Shihong, Lü Jidong. Obstacle Avoidance Method of Apple Harvesting Robot Manipulator[J]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(11):253-259.

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  • 在線發(fā)布日期: 2013-11-07
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