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直接驅動機器人自適應-PD復合運動控制研究
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國家自然科學基金資助項目(51265040)


Robot Control Using a Hybrid Controller Composed of an Adaptive Controller and a PD Controller
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    摘要:

    針對直接驅動機器人結構參數(shù)與摩擦參數(shù)的非確定性,提出機器人自適應-PD控制策略。首先分析了機器人的兩類不確定性,推演了機器人動力學方程,給出不確定性動力學結構量的線性化表示;然后,對關節(jié)摩擦力矩矢進行了建模;為補償動力學不確定性給機器人帶來的控制誤差,構建含位置與速度反饋的雙閉環(huán)控制系統(tǒng),引入自適應機構辨識不確定性參量,并據(jù)此規(guī)劃出自適應控制律;為提高運動控制精度,在控制器中嵌入PD子控制器。仿真實驗顯示,系統(tǒng)的位置和角速度跟蹤誤差分別為-0.02°~0.03°與±0.005rad/s,表明自適應-PD控制律可實現(xiàn)直接驅動機器人精密軌跡控制。

    Abstract:

    In order to improve the direct drive robot (DDR)’s trajectory tracking accuracy, a hybrid controller consisting of an adaptive sub controller and a PD sub controller was proposed. Firstly, the dynamical uncertainty of the robot was investigated while the uncertainty friction in the robot joints was modeled and the kinematics equation of the robot manipulator was derived. Then, a two close loops control system with position and speed feedback was built for the robot, and an adaptive controller being capable of identifying the uncertainties of the robot’s manipulator was employed so as to compensate the control error brought from the robot’s dynamic uncertainty. Moreover, a PD controller was embedded in the hybrid controller so as to improve the robot’s tracking accuracy. With the aim to guarantee the stability of the system, an adaptive law was presented. Finally, simulations have been accomplished to validate the feasibility of the controller. The results show that the position error and speed tracking error of the robot are limited to -0.02°~0.03° and ±0.005rad/s, which means that hybrid controller can make the robots track the desired trajectory with higher precision, and it exists widely application prospect.

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賀紅林,占曉煌,劉文光,封立耀.直接驅動機器人自適應-PD復合運動控制研究[J].農(nóng)業(yè)機械學報,2014,45(5):271-277. He Honglin, Zhan Xiaohuang, Liu Wenguang, Feng Liyao. Robot Control Using a Hybrid Controller Composed of an Adaptive Controller and a PD Controller[J]. Transactions of the Chinese Society for Agricultural Machinery,2014,45(5):271-277.

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  • 收稿日期:2013-04-05
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  • 在線發(fā)布日期: 2014-05-10
  • 出版日期: 2014-05-10