By Patrizio Colaneri

ISBN-10: 0121791904

ISBN-13: 9780121791902

Keep an eye on structures layout methodologies have lengthy suffered the conventional and myopic dichotomy among time and frequency area ways, every one of them being really expert to deal with basically scarcely overlapping functionality requisites. This booklet is geared toward bridging the 2 methods by means of offering layout methodologies according to the minimization of the norm (H2/Hoo) of an appropriate move function.In a concise and self-contained demeanour this e-book offers uncomplicated history fabric on powerful keep watch over idea, in addition to more moderen achievements, corresponding to powerful balance and strong functionality within the presence of parameter uncertainties. It encompasses a new standpoint on classical LQC effects and additional sections on:. strong synthesis. nonclassical optimization difficulties. research and synthesis of doubtful systemsA systematic e-book in this subject is lengthy late and keep watch over idea and layout may be crucial studying for graduates and people getting into the learn box. As care has been taken to provide the entire required mathematical heritage, the publication is usually compatible for undergraduate scholars with a few wisdom of uncomplicated structures and keep watch over.

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Extra info for Control Theory and Design: An RH2 and RH Viewpoint

Example text

Eq. 5. POLES AND ZEROS 33 that XL = {s-X)~^v and, from eq. 15), [CXL-\-DW{S-X)-'^]{S-X) = yL{s-X) = 0. Since y{0) = 0 (eq. 15)), the conclusion is drawn that y{t) = 0, t > 0. In particular, if It; ^ 0 then condition ii) is verified, whereas, if i^ = 0, then eqs. 15) entail, in view of the PBH test, that condition i) holds. e. Ai A2 0 A3 B C=[Ci B2 0 where the pair (yli, Ci) is observable. If condition i) holds (namely A is an eigenvalue of A3) choose 2: = [0 ^' 0]', where ^ ^ 0 is such that {XI - A^)^ = 0.

15, it follows that i^i(s), Fs{s), ^4(5) and Feis) are elements of RL2. Moreover, ^4(5) and FQ{S) are also elements of RH2 and Fs(s) is an element of RH^. Finally, notice that Fi{s) s+1 (5 + 2 ) ( s - 3 ) Fis(s) + Fia{s) 5(s + 2) 5(s-3) where Fis{s) G RH2 and Fia{s) G RH^. Hence, an element of RL2 has been shown to equal the sum of a stable function and an antistable one. 20 In linear system theory, the norm of a function in RH2 lends itself to particularly significant characterizations. To put them into light, consider the time-invariant system X = Ax-\- Bw, x(0) = 0 z = Cx and assume that it is completely reachable and observable.

The square roots ai{A)^i — l , - - - m of the eigenvalues of A^A are called singular values of A. • Notice that the singular values of A are real and nonnegative, since A'^A is a hermitian and positive semidefinite matrix. Of course, m—rank [A] singular values of A are in fact zero. The singular values of A can be put into evidence by the so-called singular value decomposition of A^ whose existence is established in the theorem below. Its proof, which is reported in Appendix B, is based on a few preliminarily steps that provide a way, although not optimal for the computational burden, to determine such a decomposition.

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Control Theory and Design: An RH2 and RH Viewpoint by Patrizio Colaneri


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