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考慮非線性摩擦模型的機器人動力學參數(shù)辨識
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國家自然科學基金項目(51575256、51375230)


Dynamic Parameter Identification for Robot Manipulators with Nonlinear Friction Model
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    摘要:

    針對機器人動力學參數(shù)辨識的問題,,提出了一種基于人工蜂群算法的辨識方法,??紤]到關節(jié)摩擦特性,,引入非線性摩擦模型,,推導了機器人動力學模型的非線性形式,。設計滿足速度,、加速度邊界條件的五階傅里葉級數(shù)作為激勵軌跡來采集實驗數(shù)據(jù),;利用人工蜂群算法,以蜂群為搜索單位,,通過群體間的信息交流方式與優(yōu)勝劣汰機制,,對模型中的未知參數(shù)進行了辨識,。最后,對得到的辨識模型進行了分析與驗證,,結果表明通過辨識得到關節(jié)預測力矩與測量力矩有較高的匹配度,,所建立的非線性模型能夠更好地描述機器人的動力學特性。

    Abstract:

    Aiming at the dynamical parameter identification for robot manipulator, the artificial bee colony algorithm for identification was proposed. Considering the friction characteristics that the friction model was unable to reappear the behavior of complex dynamic friction at low speeds, the nonlinear robot model contained the nonlinear friction model was deduced by introducing the nonlinear Daemi-Heimann model. Then, the five order Fourier series was designed as exciting trajectory to collect experimental data, which satisfied velocity and acceleration boundary conditions. With the artificial bee colony algorithm, the colony bee was employed as search unit to identify unknown parameters which included 15 minimum inertia parameters and 12 friction parameters in the model through exchanging the information and retaining the superior individual. Finally, the established model was validated and analyzed, and all the results demonstrated that the proposed identification algorithm can accurately identify the dynamical parameters, and it also had highspeed convergence, strong search capability and can achieve the accurate prediction of robot driving torque. Compared with the linear dynamic model, the established nonlinear dynamical model can effectively improve the condition of sudden change about friction torque at the moment of joints commutation and can well reflect the dynamical characteristics of robot.

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席萬強,陳柏,丁力,吳洪濤,謝本華.考慮非線性摩擦模型的機器人動力學參數(shù)辨識[J].農(nóng)業(yè)機械學報,2017,48(2):393-399. XI Wanqiang, CHEN Bai, DING Li, WU Hongtao, XIE Benhua. Dynamic Parameter Identification for Robot Manipulators with Nonlinear Friction Model[J]. Transactions of the Chinese Society for Agricultural Machinery,2017,48(2):393-399.

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  • 收稿日期:2016-06-14
  • 最后修改日期:2017-02-10
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  • 在線發(fā)布日期: 2017-02-10
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