Sum of Squares Optimization
Sum of Squares Optimization
in the Analysis and Synthesis of Control Systems
Pablo A. Parrilo
mit.edu/~parrilo
Laboratory for Information and Decision Systems Electrical Engineering and Computer Science Massachusetts Institute of Technology
ACC 2006 - Sum of squares optimization ? p. 1/39
Outline
Motivating examples: problems we want to solve Analysis and synthesis for nonlinear systems Partial differential inequalities Polynomial systems and semialgebraic games.
Sum of squares programs Convexity, relationships with semidefinite programming Interpretations
Exploiting structure for efficiency Algebraic and Numerical techniques.
Perspectives, limitations, and challenges
ACC 2006 - Sum of squares optimization ? p. 2/39
Control problems
How to provide "satisfactory" computational solutions? For instance: How to prove stability of a nonlinear dynamical system? Region of attraction of a given equilibrium? What about performance guarantees? If uncertain/robust, how to compute stability margins? What changes (if anything) for switched/hybrid systems?
ACC 2006 - Sum of squares optimization ? p. 3/39
Control problems
How to provide "satisfactory" computational solutions? For instance: How to prove stability of a nonlinear dynamical system? Region of attraction of a given equilibrium? What about performance guarantees? If uncertain/robust, how to compute stability margins? What changes (if anything) for switched/hybrid systems?
Many undecidability/hardness results (e.g., Sontag, Braatz et al., Toker, Blondel & Tsitsiklis, etc.).
ACC 2006 - Sum of squares optimization ? p. 3/39
Control problems
How to provide "satisfactory" computational solutions? For instance: How to prove stability of a nonlinear dynamical system? Region of attraction of a given equilibrium? What about performance guarantees? If uncertain/robust, how to compute stability margins? What changes (if anything) for switched/hybrid systems?
Many undecidability/hardness results (e.g., Sontag, Braatz et al., Toker, Blondel & Tsitsiklis, etc.). "Good" bounds can be obtained by considering associated convex optimization problems (e.g., linearization, D-scales, IQCs, etc)
ACC 2006 - Sum of squares optimization ? p. 3/39
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