Title: H-infinity controller design for pneumatic servosystem: a comparative study

Authors: Randeep Kaur; Jyoti Ohri

Addresses: Electrical Engineering Department, N.I.T., Kurukshetra – 136119, Haryana, India ' Electrical Engineering Department, N.I.T., Kurukshetra – 136119, Haryana, India

Abstract: In recent times, pneumatic servosystems have received wide acceptance in industries and other special systems. Current researches focus on improving the disturbance rejection properties of pneumatic servosystems to work well in industrial environment. So far many controllers have been developed to control the system, of which the H_∞ controller is found to guarantee robustness and performance. In this paper, design of robust H-infinity controller is proposed for pneumatic servo system using different techniques such as mixed sensitivity function, loop shaping design using Glover-McFarlane method and optimal controller design based on solution of Riccati equations and comparative analysis is done with conventional PID controller tuned using Ziegler-Nichols method. Comparison with a well tuned PID controller shows the efficacy of H_∞ controller designed using the proposed algorithms.

Keywords: pneumatic servosystems; H-infinity control; controller design; mixed sensitivity; loop shaping; PID control.

DOI: 10.1504/IJAAC.2014.064162

International Journal of Automation and Control, 2014 Vol.8 No.3, pp.242 - 259

Received: 14 Jan 2014
Accepted: 29 Mar 2014
Published online: 28 Aug 2014 *

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