By Graziano Chesi

The balance of equilibrium issues performs a basic function in dynamical structures. For nonlinear dynamical structures, which characterize the vast majority of actual crops, an research of balance calls for the characterization of the area of charm (DA) of an equilibrium aspect, i.e., the set of preliminary stipulations from which the trajectory of the procedure converges to this kind of element. it truly is famous that estimating the DA, or maybe extra trying to regulate it, are very tricky difficulties due to the advanced courting of this set with the version of the system.

The publication additionally bargains a concise and straightforward description of the most good points of SOS programming which might be utilized in learn and educating. particularly, it introduces quite a few periods of SOS polynomials and their characterization through LMIs and addresses regular difficulties resembling institution of positivity or non-positivity of polynomials and matrix polynomials, deciding upon the minimal of rational capabilities, and fixing platforms of polynomial equations, in situations of either unconstrained and limited variables. The innovations provided during this publication are available the MATLAB® toolbox SMRSOFT, which are downloaded from http://www.eee.hku.hk/~chesi.

Domain of Attraction addresses the estimation and regulate of the DA of equilibrium issues utilizing the radical SOS programming scheme, i.e., optimization options which were lately built in response to polynomials which are sums of squares of polynomials (SOS polynomials) and that quantity to fixing convex optimization issues of linear matrix inequality (LMI) constraints, sometimes called semidefinite courses (SDPs). For the 1st time within the literature, a way of facing those matters is gifted in a unified framework for varied circumstances looking on the character of the nonlinear structures thought of, together with the circumstances of polynomial platforms, doubtful polynomial platforms, and nonlinear (possibly doubtful) non-polynomial platforms. The equipment proposed during this e-book are illustrated in various actual structures and simulated platforms with randomly selected constructions and/or coefficients which include chemical reactors, electrical circuits, mechanical units, and social versions.

The ebook additionally bargains a concise and straightforward description of the most good points of SOS programming which are utilized in examine and instructing. particularly, it introduces numerous sessions of SOS polynomials and their characterization through LMIs and addresses regular difficulties reminiscent of institution of positivity or non-positivity of polynomials and matrix polynomials, choosing the minimal of rational features, and fixing platforms of polynomial equations, in circumstances of either unconstrained and restricted variables. The concepts provided during this ebook come in the MATLAB® toolbox SMRSOFT, which might be downloaded from http://www.eee.hku.hk/~chesi.

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Additional info for Domain of Attraction: Analysis and Control via SOS Programming

Example text

Then, f (x) is SOS if and only if λ pol ( f ) ≥ 0. 59) Proof. 53). Lastly, if f = 0, one has that λ pol ( f ) = 0 and f (x) is SOS since f (x) = 0. 14. Clearly: 1. f (x) is nonnegative if and only if μ pol ( f ) ≥ 0. 2. f (x) is positive if μ pol ( f ) > 0. The following result provides a relationship between the SOS index and the positivity index. 7. Consider f ∈ Pn . Then, λ pol ( f ) ≤ μ pol ( f ). 62) Proof. 58) by b pol (x, m) and b pol (x, m), respectively. 58) holds. Lastly, if f = 0, one simply has that λ pol ( f ) = μ pol ( f ) = 0.

Proof. Suppose that f (x) is SOS. 53) holds. For such an α , one can write F + L(α ) = H H according to the Cholesky decomposition for some H ∈ Rd pol (n,m)×d pol (n,m) . Let G ∈ Rk×d pol (n,m) be the submatrix of H containing only the rows of H that are not null. It follows that k ≤ d pol (n, m) and that G G = F + L(α ). 54). In order to further characterize SOS polynomials, we introduce the following index. 14 (SOS Index). Consider f ∈ Pn , and define f = COE pol ( f ) and F + L(α ) = CSMR pol ( f ).

Consider f ∈ Pn and suppose that (n, ∂ f ) ∈ E . Suppose also that f (x) is positive and that its highest degree form is positive definite. e. ∃F > 0 : f (x) = b pol (x, m) Fb pol (x, m). 210) Proof. Suppose that f (x) is positive and that its highest degree form is positive definite. 7 Notes and References 43 where a = min x f (x) b pol (x, m) 2 . We have that a > 0 and that g(x) is nonnegative. 9 that g(x) is SOS. Hence, there exists G ≥ 0 such that g(x) = b pol (x, m) Gb pol (x, m). Now, let us express f (x) as f (x) = b pol (x, m) Fb pol (x, m).

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