Robust control synthesis with general frequency domain specifications: static gain feedback case

2004 ◽  
Author(s):  
T. Iwasaki ◽  
S. Hara
Keyword(s):  
Robust Control ◽  
Frequency Domain ◽  
Control Synthesis ◽  
General Frequency

ROBUST CONTROL SYNTHESIS VIA A GENETIC ALGORITHM AND LMIS

2002 ◽  
Vol 35 (1) ◽  
pp. 1-6 ◽  
Author(s):  
R.H.C. Takahashi ◽  
D.C.W. Ramos ◽  
P.L.D. Peres
Keyword(s):  
Genetic Algorithm ◽  
Robust Control ◽  
Control Synthesis

Simultaneous parametric uncertainty modeling and robust control synthesis by LFT scaling

Automatica ◽  
2000 ◽  
Vol 36 (10) ◽  
pp. 1457-1467 ◽  
Author(s):  
T. Asai ◽  
S. Hara ◽  
T. Iwasaki
Keyword(s):  
Robust Control ◽  
Parametric Uncertainty ◽  
Uncertainty Modeling ◽  
Control Synthesis

Application of CRONE Control to a Sampled Time Varying System With Periodic Coefficients

2008 ◽  
Vol 130 (6) ◽  
Author(s):  
Jocelyn Sabatier ◽  
Aitor Garcia Iturricha ◽  
Mathieu Moze ◽  
Alain Oustaloup
Keyword(s):  
Robust Control ◽  
Frequency Domain ◽  
Discrete Time ◽  
Time Varying ◽  
Periodic Coefficients ◽  
Crone Control ◽  
Time Varying Systems

An application of CRONE robust control extended to discrete-time-varying systems with periodic coefficients is presented. The application is carried out in the frequency domain through the representation of considered systems using time varying z-transforms and time varying pseudofrequency responses.

Estimating Model Uncertainty using Confidence Interval Networks: Applications to Robust Control

2005 ◽  
Vol 128 (3) ◽  
pp. 626-635 ◽  
Author(s):  
Gregory D. Buckner ◽  
Heeju Choi ◽  
Nathan S. Gibson
Keyword(s):  
Robust Control ◽  
Confidence Interval ◽  
Soft Computing ◽  
Model Uncertainty ◽  
Intelligent System ◽  
Magnetic Bearing ◽  
Active Magnetic Bearing ◽  
Control Synthesis ◽  
Model Parameters ◽  
Computing Approach

Robust control techniques require a dynamic model of the plant and bounds on model uncertainty to formulate control laws with guaranteed stability. Although techniques for modeling dynamic systems and estimating model parameters are well established, very few procedures exist for estimating uncertainty bounds. In the case of H∞ control synthesis, a conservative weighting function for model uncertainty is usually chosen to ensure closed-loop stability over the entire operating space. The primary drawback of this conservative, “hard computing” approach is reduced performance. This paper demonstrates a novel “soft computing” approach to estimate bounds of model uncertainty resulting from parameter variations, unmodeled dynamics, and nondeterministic processes in dynamic plants. This approach uses confidence interval networks (CINs), radial basis function networks trained using asymmetric bilinear error cost functions, to estimate confidence intervals associated with nominal models for robust control synthesis. This research couples the “hard computing” features of H∞ control with the “soft computing” characteristics of intelligent system identification, and realizes the combined advantages of both. Simulations and experimental demonstrations conducted on an active magnetic bearing test rig confirm these capabilities.

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