Two-degree-of-freedom output feedback controllers for nonlinear processes

2000 ◽  
Author(s):  
R.A. Wright ◽  
C. Kravaris
Keyword(s):  
Output Feedback ◽  
Degree Of Freedom ◽  
Nonlinear Processes ◽  
Feedback Controllers ◽  
Two Degree Of Freedom

Design of Robust Two-Degree-of-Freedom Controllers for Position Servos Using H-Infinity Theory

1992 ◽  
Vol 206 (2) ◽  
pp. 135-142 ◽  
Author(s):  
R Piché ◽  
S Pohjolainen ◽  
T Virvalo
Keyword(s):  
Closed Loop ◽  
Synthesis Method ◽  
Degree Of Freedom ◽  
Linear Feedback ◽  
Closed Loop System ◽  
Feedback Controllers ◽  
H Infinity ◽  
Structured Singular Value ◽  
Performance Specifications ◽  
Two Degree Of Freedom

Linear feedback controllers for position servos are designed using the structured singular value optimization (Doyle's μ-synthesis) method. The method produces a two-degree-of-freedom controller, including both the feedback and the prefilter, which is ‘performance robust’, in the sense that the closed-loop system is guaranteed to meet performance specifications in the presence of unmodelled dynamics. A detailed design of a low-order controller for a hydraulic position servo, including numerical non-linear simulation results, is presented.

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