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Dynamic modeling and robust control in task space of 4-DOF parallel
electric platform with 4TPS-1PS structure |
| WANG Xuan-Yin, CHENG Jia |
| State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China |
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Abstract The 4TPS-1PS parallel platform designed for the stabilization and tracking system is a novel lower-mobility parallel mechanism, which has four degrees of freedom including rotations around three coordinate axes and translation along one coordinate axis. The dynamics model of the 4TPS-1PS platform including upper plate, electric cylinders and slave leg was built by Lagrange method based on kinematics analysis. The platform was controlled as a whole, and a robust controller in task space was presented, in which the platform’s pose was computed out by realtime forward kinematics and was taken as the feedback. A sliding mode variable structure controller was designed in task space. The experimental results of two-degrees-of-freedom rotation showed that the performance of the platform was improved and the pose tracking precision was less than 0-05°.
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Published: 28 September 2009
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4TPS-1PS四自由度并联电动平台动力学建模与位姿闭环鲁棒控制
4TPS-1PS四自由度并联平台是针对稳定跟踪系统需要而设计的一种新型并联机构,具有3个独立的转动自由度和1个移动自由度.对该新型并联平台进行运动学分析,将其分为上平台、电动缸、从动支链3个部分,利用拉格朗日方法建立了完整动力学模型,在此基础上提出一种适用于该并联平台的位姿闭环鲁棒控制策略.采用该并联平台特有的实时正解得到上平台实际位姿进行反馈,将平台作为一个整体进行控制,在任务空间内设计滑模变结构控制器,进行两自由度复合运动控制实验.结果表明,该控制策略是有效的,提高了平台的轨迹跟踪精度,平均位姿跟踪精度优于0.05°.
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| [1] BHASKAR D, MRUTHYUNJAYA T S. The Stewart platform manipulator: a review [J]. Mechanism and Machine Theory, 2000, 35(1): 15-40.
[2] HUANG C I, FU L C. Smooth sliding mode tracking control of the Stewart platform [C]∥ Proceedings of the 2005 IEEE Conference on Control Applications. Toronto: IEEE, 2005: 43-48.
[3] 杨志永,黄田,倪雁冰. 3-HSS并联机床动力学建模及鲁棒轨迹跟踪控制[J]. 机械工程学报, 2004, 40(11): 75-81.
YANG Zhi-yong, HUANG Tian, NI Yan-bing. Dynamic modeling and trail tracking robust control of 3-HSS parallel kinematic machine [J]. Chinese Journal of Mechanical Engineering, 2004, 40(11): 75-81.
[4] SIROUSPOUR M R, SALCUDEAN S E. Nonlinear control of hydraulic robots [J]. IEEE Transactions on Robotics and Automation, 2001, 17(2): 173-182.
[5] 王洪斌,王洪瑞,肖金壮.并联机器人轨迹跟踪积分变结构控制的研究[J]. 燕山大学学报, 2003, 27(1): 25-28.
WANG Hong-bin, WANG Hong-rui, XIAO Jin-zhuang. Study on trajectory following of parallel robot using integral variable structure control [J]. Journal of Yanshan University, 2003, 27(1): 25-28.
[6] CHENG J, WANG X Y, FU X J, et al. Research on the operating characteristics of the parallel 4-DOF electric platform with 4TPS-PS structure [J]. Journal of Zhejiang University: Science A, 2007, 8(11): 1800-1807.
[7] BHASKAR D, MRUTHYUNJAYA T S. A Newton-Euler formulation for the inverse dynamics of the Stewart platform manipulator [J]. Mechanism and Machine Theory, 1998, 33(8): 1135-1152.
[8] PANG H, SHAHINPOOR M. Inverse dynamics of a parallel manipulator [J]. Journal of Robotic Systems, 1994, 11(8): 693-702.
[9] LIU Min-jie, LI Cong-xin, LI Chong-ni. Dynamics analysis of the Gough-Stewart platform manipulator [J]. IEEE Transactions on Robotics and Automation, 2000, 16(1): 94-98.
[10] 高为炳. 变结构控制理论基础[M]. 北京:中国科学技术出版社, 1990: 124-129. |
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