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神經網絡與計算力矩復合的機器人運動軌跡跟蹤控制
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國家自然科學基金資助項目(51265040);江西省教育廳科學技術研究資助項目(GJJ12416)


Tracking Control of Robot Using Hybrid Controller Based on Neural Network and Computed Torque
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    摘要:

    為了實現機器人精密運動控制,,在其關節(jié)系統(tǒng)引入計算力矩法(CTC)與神經網絡復合的控制器,旨在通過CTC實現系統(tǒng)的初步控制并利用神經網絡補償機器人的不確定動力學特性所帶來的運動誤差。首先,,建立了機器人的動力學模型并對其不確定性動力學量進行了描述,;然后,,為機器人構建了雙閉環(huán)控制系統(tǒng),,并依據機器人標稱模型規(guī)劃出CTC控制律,;進而,,引入函數鏈神經網絡(FLNN)對不確定性動力學量進行估值,,并推導出FLNN的學習律;最后,,對系統(tǒng)進行了仿真,,結果顯示,該復合控制器可將關節(jié)位置和速度跟蹤誤差控制在±0.001rad和±0.001rad/s之內,,且其對機器人的參數變化及外部擾動具有較強的自適應性與魯棒性,。

    Abstract:

    In order to improve robot manipulator’s tracking accuracy, a hybrid controller consisting of a functional link neural network sub controller (FLNNC) and a computed torque sub-controller (CTC) was introduced into the manipulator, which made use of CTC to drive the manipulator reaching its desired position roughly while employed the FLNNC to compensate the tracking error caused by the dynamic uncertainty and disturbance of the robot. To accomplish this, firstly, a nominal dynamic model of the manipulator was established, and the dynamic uncertainty of the robot manipulator was modeled and formulized. And then, a control system with two close loops was built for the manipulator, and the computed-torque control law based on the nominal manipulator model was planned for the system. Moreover, a functional link neural network (FLNN) being capable of approximating the dynamic uncertainty term of the robot was designed in the system, and the weight learning algorithm for the FLNN was derived. Finally, simulations were made on that system so as to validate the hybrid controller. The results showed that both the position error and speed tracking error of the robot joints could be controlled within ±0.001rad and ±0.001rad/s, which meant that the proposed hybrid controller was able to make the robots tracking desired trajectory with high precision.

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賀紅林,何文叢,劉文光,封立耀.神經網絡與計算力矩復合的機器人運動軌跡跟蹤控制[J].農業(yè)機械學報,2013,44(5):270-275. He Honglin, He Wencong, Liu Wenguang, Feng Liyao. Tracking Control of Robot Using Hybrid Controller Based on Neural Network and Computed Torque[J]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(5):270-275.

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  • 在線發(fā)布日期: 2013-04-28
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