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Download e-book for iPad: Analytic Curve Frequency-Sweeping Stability Tests for by Xu-Guang Li, Silviu-Iulian Niculescu, Arben Cela

By Xu-Guang Li, Silviu-Iulian Niculescu, Arben Cela

ISBN-10: 3319157167

ISBN-13: 9783319157160

ISBN-10: 3319157175

ISBN-13: 9783319157177

In this short the authors identify a brand new frequency-sweeping framework to resolve the total balance challenge for time-delay structures with commensurate delays. The textual content describes an analytic curve point of view which permits a deeper realizing of spectral homes concentrating on the asymptotic habit of the attribute roots situated at the imaginary axis in addition to on homes invariant with admire to the hold up parameters. This asymptotic habit is proven to be similar via one other novel inspiration, the twin Puiseux sequence which is helping make frequency-sweeping curves necessary within the learn of basic time-delay structures. The comparability of Puiseux and twin Puiseux sequence ends up in 3 vital results:

  • an specific functionality of the variety of volatile roots simplifying research and layout of time-delay structures in order that to some extent they're handled as finite-dimensional systems;
  • categorization of all time-delay platforms into 3 forms in accordance with their final balance homes; and
  • a basic frequency-sweeping criterion permitting asymptotic habit research of severe imaginary roots for all confident severe delays by means of observation.

Academic researchers and graduate scholars drawn to time-delay platforms and practitioners operating in various fields – engineering, economics and the existence sciences regarding move of fabrics, power or details that are inherently non-instantaneous, will locate the consequences offered the following valuable in tackling a few of the complex difficulties posed via delays.

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Additional resources for Analytic Curve Frequency-Sweeping Stability Tests for Systems with Commensurate Delays

Example text

More precisely, we followed the ideas proposed by [15, 60, 91, 121] in order to introduce some of the In fact, each x μi may have multiple values. We may choose any one among them. As will be illustrated by the examples in Chap. 4, the value set of all the Puiseux series is identical for any choice. 4 26 2 Introduction to Analytic Curves notions and properties needed in the forthcoming chapters. From the next chapter, we will apply these results to study the complete stability problem of time-delay systems.

We may either compute the derivative of λ with respect to τ by using the implicit function theorem (see [97]) or observe the frequency-sweeping curve (see [21]). 0025 j from right to left. 1002. 7178). 9913); . .. As the invariance property has been proved for the simple critical imaginary root case, we have stronger results: Each time τ increases near some τ0,k (τ1,k ), two roots cross C0 from right to left (from left to right). Moreover, such results can be directly known from the frequency-sweeping curve.

1. All the three quasipolynomials have a triple critical imaginary root. However, they exhibit different types of Puiseux series. Next, we present an example with g > n. To the best of the authors’ knowledge, such cases have not been sufficiently discussed in the literature. Finally, we consider an example with a critical imaginary root at the origin. 1)). For τ = π , λ = j is a triple critical imaginary root ( f λ ( j, π ) = f λλ ( j, π ) = 0 and f λ3 ( j, π ) = 0). As 40 4 Computing Puiseux Series for a Critical Pair f τ ( j, π ) = f τ τ ( j, π ) = 0 and f τ 3 ( j, π ) = 0, g = 3.

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