Robust variable structure control of model reference systems
作者:
S.K.Spurgeon,
R.J.Patton,
期刊:
IEE Proceedings D (Control Theory and Applications)
(IET Available online 1990)
卷期:
Volume 137,
issue 6
页码: 341-348
年代: 1990
DOI:10.1049/ip-d.1990.0045
出版商: IEE
数据来源: IET
摘要:
A variable structure control system (VSCS) yields total or selective invariance to system parameter variations and disturbances when in the sliding mode. In order to prescribe the system performance, a model-following approach to VSCS design is used. The required behaviour is achieved by defining a model with ideal response characteristics, and a VSCS is designed so that the error between the plant and the model is forced to exhibit a sliding mode. A parameter insensitive controller with improved disturbance rejection which achieves desired system performance results. The resulting nonlinear scheme cannot be assessed using conventional frequency domain techniques. A new analysis tool is therefore proposed and used to explore the robustness of such a nonlinear control scheme. The design technique is illustrated for lateral multimode control. The aircraft system requires a parameter insensitive control type with improved disturbance rejection if possible. In addition, the ability to prescribe flying quality requirements directly is important. The problem thus provides a suitable challenge for the technique. The robustness analysis is illustrated using the resulting VSCS applied to a range of realistic perturbation models of the fully nonlinear aircraft model.
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