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Front. Inform. Technol. Electron. Eng.  2017, Vol. 18 Issue (3): 303-316    DOI: 10.1631/FITEE.1500353
Regular Papers     
Posture control of a 3-RPS pneumatic parallel \\[3mm] platform with parameter initialization and an \\[4mm] adaptive robust method
Guo-liang Tao, Ce Shang, De-yuan Meng, Chao-chao Zhou
The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China; School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China
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Abstract  A control algorithm for a 3-RPS parallel platform driven by pneumatic cylinders is discussed. All cylinders are controlled by proportional directional valves while the kinematic and dynamic properties of the system are modeled. The method of adaptive robust control is applied to the controller using a back-stepping approach and online parameter estimation. To compensate for the uncertainty and the influence caused by estimations, a fast dynamic compensator is integrated in the controller design. To prevent any influence caused by the load applied to the moving platform changing in a practical working situation, the identification of parameters is taken as the initialization of unknown parameters in the controller, which can improve the adaptability of the algorithm. Using these methods, the response rate of the parameter estimation and control performance were improved significantly. The adverse effects of load and restriction forces were eliminated by the initialization and online estimation. Experiments under different situations illustrated the effectiveness of the adaptive robust controller with parameter initialization, approaching average tracking errors of less than 1%.

Key wordsParameter initialization      Adaptive robust control      Parallel mechanism      Pneumatic cylinders     
Received: 21 October 2015      Published: 10 March 2017
CLC:  TP273  
Cite this article:

Guo-liang Tao, Ce Shang, De-yuan Meng, Chao-chao Zhou. Posture control of a 3-RPS pneumatic parallel \\[3mm] platform with parameter initialization and an \\[4mm] adaptive robust method. Front. Inform. Technol. Electron. Eng., 2017, 18(3): 303-316.

URL:

http://www.zjujournals.com/xueshu/fitee/10.1631/FITEE.1500353     OR     http://www.zjujournals.com/xueshu/fitee/Y2017/V18/I3/303

[1] Guo-liang Tao, Ce Shang, De-yuan Meng, Chao-chao Zhou. Posture control of a 3-RPS pneumatic parallel platform with parameter initialization and an adaptive robust method[J]. Front. Inform. Technol. Electron. Eng., 2017, 18(3): 303-316.
[2] De-yuan Meng, Guo-liang Tao, Ai-min Li, Wei Li. Motion synchronization of dual-cylinder pneumatic servo systems with integration of adaptive robust control and cross-coupling approach[J]. Front. Inform. Technol. Electron. Eng., 2014, 15(8): 651-663.