Domain of Attraction: Analysis and Control via SOS by Graziano Chesi

By Graziano Chesi

The balance of equilibrium issues performs a primary position in dynamical platforms. For nonlinear dynamical platforms, which signify nearly all of genuine 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 approach converges to this sort of aspect. it's famous that estimating the DA, or maybe extra trying to keep an eye on 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 easy description of the most positive factors of SOS programming which are utilized in study and instructing. particularly, it introduces a number of periods 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, identifying the minimal of rational services, and fixing structures of polynomial equations, in situations of either unconstrained and restricted variables. The ideas awarded during this ebook come in the MATLAB® toolbox SMRSOFT, that are downloaded from http://www.eee.hku.hk/~chesi.

Domain of Attraction addresses the estimation and keep an eye on of the DA of equilibrium issues utilizing the unconventional SOS programming scheme, i.e., optimization ideas which have been lately built in accordance with 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 method of facing those concerns is gifted in a unified framework for numerous circumstances reckoning on the character of the nonlinear structures thought of, together with the situations of polynomial structures, doubtful polynomial structures, and nonlinear (possibly doubtful) non-polynomial platforms. The tools proposed during this publication are illustrated in various actual platforms and simulated platforms with randomly selected buildings and/or coefficients inclusive of chemical reactors, electrical circuits, mechanical units, and social types.

The e-book additionally bargains a concise and easy description of the most positive aspects of SOS programming which might be utilized in learn and instructing. particularly, it introduces numerous sessions of SOS polynomials and their characterization through LMIs and addresses standard difficulties reminiscent of institution of positivity or non-positivity of polynomials and matrix polynomials, opting for the minimal of rational services, and fixing structures of polynomial equations, in circumstances of either unconstrained and limited variables. The recommendations awarded during this booklet come in the MATLAB® toolbox SMRSOFT, which might be downloaded from http://www.eee.hku.hk/~chesi.

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Example text

T. 3) P(Q) + L(α ) = CSMR pol (p) p(x) = q(x) f (x) q(x) = b pol (x, k) Qb pol (x, k). 4) Then, λ pol ( f , k) is called generalized SOS index of f (x). As it can be observed from its definition and as it will become clearer in the sequel, the generalized SOS index is a measure of how a polynomial is the ratio of two SOS polynomials. 3) corresponds to the maximum achievable z under the condition that q(x) f (x) − z b pol (x, m) 2 and q(x) are SOS, with q(x) not identically zero and m = m0 + k = ∂ q f /2 .

By repeating this procedure for all i = 1, . . 184). Case VIII. 178) when u satisfies m + 1 ≤ u ≤ n(m − 1) + 1. 189) Clearly, this implies that n ≥ 2. 164) with x i , . . , xm i x j1 , x j1 xi , . . , x j1 xim−2 .. 190) x jk , x jk xi , . . 183). 184). 13. 178) with ⎛ ⎞ ⎞ ⎛ x1 1 5 ⎜ x2 ⎟ ⎜ 3 −3 ⎟ ⎜ 2 ⎟ ⎟ ⎜ ⎜ ⎟ ⎟ blin (x, m) = ⎜ x1 ⎟ , V = ⎜ ⎜ 5 7 ⎟. ⎝ x1 x2 ⎠ ⎝ −3 3 ⎠ 9 −9 x22 We have that n = 2, m = 2 and u = 2. 179) is satisfied, and let us proceed as in Case V. 182), the set of candidates −1 , 3 Xˆ = 2 0 .

A parameter-dependent polynomial f (x, θ ) is said SOS if there exist k ∈ N and k g ∈ Pn,n such that θ k f (x, θ ) = ∑ gi (x, θ )2 . 91) holds for some k ∈ N and g ∈ Pn,n . 92) The SMR allows one to establish whether a parameter-dependent polynomial is SOS. 4 for the case of polynomials, one has that f (x, θ ) is SOS if and only if there exists α satisfying the LMI F + L(α ) ≥ 0. 5 for the case of SOS polynomials. The SOS index for parameterdependent polynomials is defined as follows. 18 (SOS Index (continued)).

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