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Design and Experimental Evaluation of a Robust Force Controller for a 6-Link Electro-Hydraulic Manipulator via H$_{\infty}$ Control Theory  

Ahn, Kyoung-Kwan (School of Mechanical and Automotive Engineering, University of Ulsan)
Lee, Byung-Ryong (School of Mechanical and Automotive Engineering, University of Ulsan)
Yang, Soon-Yong (School of Mechanical and Automotive Engineering, University of Ulsan)
Publication Information
Journal of Mechanical Science and Technology / v.17, no.7, 2003 , pp. 999-1010 More about this Journal
Abstract
Uninterrupted power supply has become indispensable during the maintenance task of active electric power lines as a result of today's highly information-oriented society and increasing demand of electric utilities. This maintenance task has the risk of electric shock and the danger of falling from high place. Therefore it is necessary to realize an autonomous robot system using electro-hydraulic manipulators because hydraulic manipulators have the advantage of electric insulation and power/mass density. Meanwhile an electro-hydraulic manipulator using hydraulic actuators has many nonlinear elements, and its parameter fluctuations are greater than those of an electrically driven manipulator. So it is relatively difficult to realize not only stable contact work but also accurate force control for the autonomous assembly tasks using hydraulic manipulators. In this paper, the robust force control of a 6-link electro-hydraulic manipulator system used in the real maintenance task of active electric lines is examined in detail. A nominal model for the system is obtained from experimental frequency responses of the system, and the deviation of the manipulator system from the nominal model is derived by a multiplicative uncertainty. Robust disturbance observers for force control are designed using this information in an H$\_$$\infty$/ framework, and implemented on the two different setups. Experimental results show that highly robust force tracking by a 6-link electro-hydraulic manipulator could be achieved even if the stiffness of environment and the shape of wall change.
Keywords
Fluid Power System; Robust Force Control; Impedance Control; Disturbance Observer; Hydraulic Manipulators; H Infinity Control;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Input-Output Feedback Stability and Robustness /
[ Zames,G. ] / IEEE Control Systems Magazine   DOI
2 AHN Kyoungkwan, YOKOTA Shinichi and YAMAMOTO Toshirou, 1998, 'Application of an Impedance-Force Control to a 6-Link Electro-Hydraulic Manipulator,' Proc. of Bath Workshop on Power Transmission and Motion Control, pp. 111-121
3 Chen, Y.N., Lee, B.C. and Tseng, C.H., 1990, 'A variable-Structure Controller Design for an Electro-Hydraulic Force Control Servo System,' Journals of the Chinese Society of Mechanical Engineers, Vol. 11, No. 6, pp. 520-526
4 AHN Kyoungkwan, YOKOTA Shinichi, OZEKI Tomohiko and YAMAMOTO Toshirou, 1998, 'Compliance Control of a 6-Link Electro-Hydraulic Manipulator (Application to the Peg-in-Hole Task),' Trans. of JSME(C), in Japanese, Vol. 64, No. 624, pp. 3019-3025   DOI
5 Alleyne, A. and Hedrick, J.K., 1995, 'Nonlinear Adaptive Control of Active Suspensions,' IEEE Trans. Control System Technology, Vol. 3, pp. 94-102   DOI   ScienceOn
6 Alleyne, A., Liu, R. and Wright, H., 1998, 'On the Limitation of Force Tracking Control for Hydraulic Active Suspensions,' Proc. of the American conrol Conference, pp. 43-47
7 Balas, G.J., Doyle, J.C., Glover, K., Packard, A. and Smith, R., 1991, 'm-Analysis and Synthesis Toolbox,' The Math Works Inc.
8 Komada, S., Nomura, K., Ishida, M., Ohnishi, K. and Hori, T., 1991, 'Robust Force Control by Estimation of Environment,' Proc. IEEE IECON'91, Vol. 1, pp. 533-537   DOI
9 Conrad, F. and Jesen, C.J.D., 1987, 'Design of Hydraulic Force Control Systems with State Estimate Feedback,' Proc. of the IFAC 10th Triennial Congress, Munich, FRG, pp. 307-312
10 Doyle, J., Glover, K., Khargonekar, P.P. and Francis, B.A., 1898, 'State Space Solution to Standard $H_2$ and $H_{\iinfty}$ Control Problems,' IEEE Trans. Automatic Control, AC-34, pp. 831-847   DOI   ScienceOn
11 Komada, S., Nomura, K., Ishida, M., Ohnishi, K. and Hori, T., 1992, 'Robust Force Control by Estimation of Environment,' Proc. 1992 IEEE Int. Conf. on Robotics and Automation, Vol. 2, pp. 1362-1367
12 LENNART Ljung, 1995, 'System Identification Toolbox-For Use with MATLAB,' The MathWorks Inc.
13 YAMAMOTO Toshirou and YOKOTA Shinichi, 1998, 'Application of Control Theory for 2-DOF Control System (A Design Method of Robust Controller for Each Axis of a Hydraulic Manipulator),' Trans of JSME(C), (in Japanese), Vol. 64, No. 617, pp. 177-184   DOI
14 Mukaida, M., Tamura, Y., Yoshimi, T., Asari, Y. and Sato, H., 1995, 'Task Planning Experiment toward an Autonomous Robot System for the Construction of overhead Distribution Lines,' Proc. of the 1995 IEEE Int. Conf. on R&A, pp. 448-455   DOI
15 Takaoka, K., Yokoyama, K., Wakisako, H., Yano, K., Higashjima, K. and Murakami, S., 2001, 'Development of Fully-Automatic Live-line Maintenance Robot- Phase III,' Proc. of the 4th IEEE Int. Symp. on Assembly and Task Planning, pp. 423-428   DOI
16 Vossoughi, G. and Donath, M., 1995, 'Dynamic Feedback Linearization for Electrohydraulically Actuated Control Systems,' ASME Journal of Dynamic Systems, Measurement and Control, Vol. 117, No. 4, pp. 468-477   DOI
17 Wu, G., Sepehri, N. and Ziaei, K., 1998, 'Design of a Hydraulic Force Motion Control System Using a Generalized Predictive Control Algorithm,' IEE Proceedings on control theory and applications, Vol. 145, No. 5, pp. 428-436   DOI   ScienceOn
18 Nakashima, M., Yakabe, H., Maruyama, Y., Yano, K., Morita, K. and Nakagaki, H., 1995, 'Application of Semi-Automatic Robot Technology on Hot-Line Maintenance Task,' Proc. of the 1995 IEEE Int. Conf. on R&A, pp. 843-850   DOI
19 Zames, G., 1996, 'Input-Output Feedback Stability and Robustness,' IEEE Control Systems Magazine, Vol. 16, No. 3, pp. 61-66   DOI   ScienceOn