Robust control of hydraulically operated gimbal system

A transmitting antenna operated on the naval vessels can be easily excited by exogenous disturbances such as tidal wave and impact. Gimbal system that supports the antenna needs the controller to maintain the robust performance against various modeling uncertainties and disturbance. PI controller, however, cannot guarantee the reasonable robust performance under these kinds of severe conditions. Thus a robustH∞ control scheme is recommended to ensure a specified dynamic response under heavy operating conditions. Gimbal system is simplified as two degree of freedom model that ignores coordinate co-relations of each direction and hydraulic system is modelled linearly. The simulation and experimental results ofH∞ controller proposed in this paper showed the better responses and stability than those of PI controller.

[1]  Ian Postlethwaite,et al.  A loop-shaping approach to robust performance for SISO systems , 1991 .

[2]  Keith Glover,et al.  A loop-shaping design procedure using H/sub infinity / synthesis , 1992 .

[3]  G. Zames.  Feedback and optimal sensitivity: Model reference transformations, multiplicative seminorms, and approximate inverses , 1981 .

[4]  Jong-Won Lee,et al.  Robust Control of the Nonlinear Hydraulic Servo System Using a PID Control Technique , 2001 .

[5]  Y. H. Kim,et al.  Effect of boron contents on weldability in high strength steel , 2007 .

[6]  J. Watton.  The Generalized Response of Servovalve-Controlled, Single-Rod, Linear Actuators and the Influence of Transmission Line Dynamics , 1984 .

[7]  P. Khargonekar,et al.  State-space solutions to standard H/sub 2/ and H/sub infinity / control problems , 1989 .

[8]  Larry L. Howell,et al.  Evaluation of equivalent spring stiffness for use in a pseudo-rigid-body model of large-deflection compliant mechanisms , 1996 .

[9]  Hung-Ching Lu,et al.  Robust controller with disturbance rejection for hydraulic servo systems , 1993, IEEE Trans. Ind. Electron..

[10]  Young-Pil Park,et al.  Active Control of Isolation Table Using $H_\infty$ Control , 1996 .

[11]  Matthew A. Franchek,et al.  Selecting the Performance Weights for the μ and H∞ Synthesis Methods for SISO Regulating Systems , 1996 .

[12]  S. Skogestad,et al.  Performance weight selection for H-infinity and μ-control methods , 1991 .

[13]  Chul H. Park,et al.  Analytical development of a robust controller for smart structural systems , 2005 .