Robust multivariable controller design methodology: stability and performance requirements

1991 ◽  
Vol 46 (5-6) ◽  
pp. 1299-1310 ◽  
Author(s):  
J.L. Figueroa ◽  
O.E. Agamennoni ◽  
A.C. Desages ◽  
J.A. Romagnoli
Keyword(s):  
Design Methodology ◽  
Controller Design ◽  
Performance Requirements ◽  
Multivariable Controller ◽  
And Performance

A New Structured Multimodel Control of Nonlinear Systems by Integrating Stability Margin and Performance

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
Mahdi Ahmadi ◽  
Mohammad Haeri
Keyword(s):  
Nonlinear Systems ◽  
Controller Design ◽  
A Priori ◽  
Design Procedure ◽  
Stability Margin ◽  
Point Tracking ◽  
Performance Requirements ◽  
Performance Specifications ◽  
And Performance ◽  
Model Redundancy

This paper deals with a new systematic multimodel controller design for nonlinear systems. The design of local controllers based on performance requirements is incorporated with the concept of local models selection as an optimization problem. Gap metric and stability margin are used as measuring tool and operation space dividing criterion, respectively. The developed method provides support to design a simple structured multiple proportional-integral (PI) controller which guarantees both robust stability and time-domain performance specifications. The main advantages of the proposed method are avoiding model redundancy, not needing a priori knowledge about system, having simple structure, and easing the implementation. To evaluate the presented multimodel controller design procedure, three benchmark nonlinear systems are studied. Both simulations and experimental results prove the effectiveness of the proposed method in set point tracking and disturbance rejection.

A New QFT Design Methodology for Feedback Systems Under Input Saturation

1999 ◽  
Vol 123 (2) ◽  
pp. 225-232 ◽  
Author(s):  
Wei Wu ◽  
Suhada Jayasuriya
Keyword(s):  
Robust Stability ◽  
Design Methodology ◽  
Design Method ◽  
Input Saturation ◽  
Function Technique ◽  
Feedback Systems ◽  
Robust Performance ◽  
Saturation Nonlinearity ◽  
Performance Requirements ◽  
And Performance

Presented in this paper is a design methodology for robust stability and robust performance for a large class of plants subject to an input saturation nonlinearity. Based on Horowitz’s 3-DOF linear design method, a more general form for the additional loop transmission around the saturating element is proposed to design the third degree of freedom Hs, for Type n plants, n⩾1. Robust stability is established with the circle criterion and the describing function technique, and robust performance is improved by imposing nonovershooting conditions. All stability and performance requirements are then transferred into frequency domain design bounds which are easily obtained using QFT design techniques. This procedure applies to all SISO, Type n, stable plants with uncertainties (parametric or nonparametric), and to marginally stable and conditionally stable plants as well.

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