Title :
A QFT design methodology for feedback systems under input saturation
Author :
Wu, Wei ; Jayasuriya, Suhada
Author_Institution :
Dept. of Mech. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
Presents 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 (1983), a more general form for the additional loop transmission around the saturating element is proposed to design the 3rd DOF H(s), for Type n stable plants, n⩾1. Robust stability is established with the circle criterion and the describing function technique, and robust performance is improved by imposing non-overshooting conditions. All stability and performance requirements are then transformed into frequency domain design bounds which are easily obtained using QFT design techniques
Keywords :
closed loop systems; control nonlinearities; control system synthesis; describing functions; feedback; frequency-domain synthesis; robust control; stability criteria; transfer functions; 3-DOF linear design method; QFT design methodology; Type n stable plants; circle criterion; describing function technique; feedback systems; frequency domain design bounds; input saturation nonlinearity; nonovershooting conditions; quantitative feedback theory; robust performance; robust stability; Control systems; Degradation; Design methodology; Feedback; Frequency domain analysis; Limit-cycles; Mechanical engineering; Robust stability; Transfer functions; Uncertainty;
Conference_Titel :
American Control Conference, 2000. Proceedings of the 2000
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-5519-9
DOI :
10.1109/ACC.2000.876700
