Wm. Lu et Jc. Doyle, ROBUSTNESS ANALYSIS AND SYNTHESIS FOR NONLINEAR UNCERTAIN SYSTEMS, IEEE transactions on automatic control, 42(12), 1997, pp. 1654-1662
Citations number
38
Categorie Soggetti
Controlo Theory & Cybernetics","Robotics & Automatic Control","Engineering, Eletrical & Electronic
A state-space characterization of robustness analysis and synthesis fo
r nonlinear uncertain systems is proposed, The robustness of a class o
f nonlinear systems subject to L-2-bounded structured uncertainties is
characterized in terms of a nonlinear matrix inequality (NLMI), which
yields a convex feasibility problem, As ire the linear case, scalings
are used to find a Lyapunov or storage function that give sufficient
conditions for robust stability and performances, Sufficient condition
s for the solvability of robustness synthesis problems are represented
in terms of NLMI's as well, With the proposed NLMI characterizations,
it is shown that the computation needed for robustness analysis and s
ynthesis is not more difficult than that for checking Lyapunov stabili
ty; the numerical solutions for robustness problems are approximated b
y the use of finite element methods or finite difference schemes, and
the computations are reduced to solving linear matrix inequalities. Un
fortunately, while the development in this paper parallels the corresp
onding linear theory, the resulting computational consequences are, of
course, not as favorable.