Direct adaptive control using an adaptive reference model

Direct model reference adaptive control is considered when the plant-model matching conditions are violated due to large changes in the plant or incorrect knowledge of the plant's mathematical structure. Because of the mismatch, the plant can no longer track the original reference model, but ma...

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Bibliographic Details
Published inInternational journal of control Vol. 84; no. 1; pp. 180 - 196
Main Authors Joshi, Suresh M., Tao, Gang, Patre, Parag
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis Group 01.01.2011
Taylor & Francis
Taylor & Francis Ltd
Subjects
Adaptative systems
adaptive control
adaptive reference model
Applied sciences
Computer science; control theory; systems
Control system analysis
Control theory. Systems
Exact sciences and technology
hybrid adaptive control
mismatch estimation
Modelling and identification
Numerical controls
plant-model mismatch
State feedback
Robust stability
Hybrid control
Feedback regulation
Stability criterion
mismatch estimation
Adaptive control
Robust control
Reference model
Time varying system
Model matching
Model reference adaptive control systems
hybrid adaptive control
plant-model mismatch
Robustness
Asymptotic approximation
System identification
adaptive reference model
State estimation
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Summary:Direct model reference adaptive control is considered when the plant-model matching conditions are violated due to large changes in the plant or incorrect knowledge of the plant's mathematical structure. Because of the mismatch, the plant can no longer track the original reference model, but may be able to track a modified reference model that still provides satisfactory performance. The proposed approach uses a time-varying 'adaptive' reference model that reflects the achievable performance of the changed plant. The approach consists of direct adaptation of state feedback gains for state tracking and simultaneous estimation of the plant-model mismatch. The reference model adapts to the changed plant, and is redesigned if the estimated plant-model mismatch exceeds a bound determined via robust stability and/or performance criteria. The resulting controller offers asymptotic state tracking in the presence of plant-model mismatch as well as matched parameter deviations.
ISSN:0020-7179
1366-5820
DOI:10.1080/00207179.2010.544756