Linear Control Theory: Structure, Robustness, and by Shankar P. Bhattacharyya, Aniruddha Datta, Lee H. Keel

By Shankar P. Bhattacharyya, Aniruddha Datta, Lee H. Keel

Successfully classroom-tested on the graduate point, Linear regulate conception: Structure, Robustness, and Optimization covers 3 significant parts of keep watch over engineering (PID regulate, strong regulate, and optimum control). It presents balanced assurance of chic mathematical idea and worthy engineering-oriented results.

The first a part of the booklet develops effects with regards to the layout of PID and first-order controllers for non-stop and discrete-time linear structures with attainable delays. the second one part bargains with the powerful balance and function of platforms less than parametric and unstructured uncertainty. This part describes a number of stylish and sharp effects, akin to Kharitonov’s theorem and its extensions, the sting theorem, and the mapping theorem. concentrating on the optimum keep watch over of linear platforms, the 3rd half discusses the traditional theories of the linear quadratic regulator, Hinfinity  and l1 optimum keep watch over, and linked effects.

Written by way of well-known leaders within the box, this booklet explains how keep watch over thought may be utilized to the layout of real-world platforms. It exhibits that the strategies of 3 time period controllers, in addition to the implications on strong and optimum keep an eye on, are worthwhile to constructing and fixing study difficulties in lots of parts of engineering.

 

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Additional resources for Linear Control Theory: Structure, Robustness, and Optimization (Automation and Control Engineering)

Example text

18) can be rewritten as ∆∞ 0 ∠p(jω) = π sgn[pi (0+ )] sgn[pr (0)] − 2sgn[pr (ω1 )] + 2sgn[pr (ω2 )] 2 −2sgn[pr (ω4 )] + sgn[pr (∞)] . 20) +π 0 −π 2 −π ω2 ω3 1 and ∆ω 0 ∠p(jω), ∆ω1 ∠p(jω), ∆ω2 ∠p(jω) are as before whereas ∆∞ ω3 ∠p(jω) = π sgn[pi (ω3+ )]sgn[pr (ω3 )]. 2(b), ∆∞ 0 ∠p(jω) = π sgn[pi (0+ )] sgn[pr (0)] − 2sgn[pr (ω1 )] + 2sgn[pr (ω2 )] 2 −2sgn[pr (ω3 )] . 1. 1 Let p(s) be a polynomial of degree n with real coefficients, without zeros on the imaginary axis. Write p(jω) = pr (ω) + jpi (ω) and let ω0 , ω1 , ω3 , · · ·, ωl−1 denote the real nonnegative zeros of pi (ω) with odd multiplicities with ω0 = 0.

2 j=1  (−1)j sgn[pr (ωj )] . Alternative Signature Expression In the previous subsection, we gave expressions for the signature of a polynomial p(s) in terms of the signs of the real part of p(jω) at the zeros of the imaginary part. Here we dualize these formulas, that is, we develop signature expressions in terms of the signs of the imaginary part at the zeros of the real part. Let v(s) denote a polynomial of degree n with real coefficients without jω axis zeros. Write as before v(s) = veven (s2 ) + svodd (s2 ) so that v(jω) = vr (ω) + jvi (ω) with vr (ω) = veven (−ω 2 ), vi (ω) = ωvodd (−ω 2 ).

Astr¨ om and H¨ agglund [7] recommend Tt to be larger than kkd and smaller than kki . 3 Conditional Integration Conditional integration is an alternative to the back-calculation technique. It simply consists of switching off the integral action when the control is far from the steady state. This means that the integral action is only used when certain conditions are fulfilled, otherwise the integral term is kept constant. We now consider a couple of these switching conditions. One simple approach is to switch off the integral action when the control error e(t) is large.

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