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

In this short the authors determine a brand new frequency-sweeping framework to resolve the entire 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 targeting the asymptotic habit of the attribute roots positioned at the imaginary axis in addition to on houses invariant with recognize to the hold up parameters. This asymptotic habit is proven to be comparable through one other novel idea, the twin Puiseux sequence which is helping make frequency-sweeping curves necessary within the research of basic time-delay platforms. The comparability of Puiseux and twin Puiseux sequence ends up in 3 very important results:

  • an particular functionality of the variety of volatile roots simplifying research and layout of time-delay platforms in order that to some extent they are handled as finite-dimensional systems;
  • categorization of all time-delay structures into 3 forms in keeping with their final balance houses; and
  • a uncomplicated frequency-sweeping criterion permitting asymptotic habit research of serious imaginary roots for all confident severe delays by way of observation.

Academic researchers and graduate scholars drawn to time-delay platforms and practitioners operating in quite a few fields – engineering, economics and the existence sciences concerning move of fabrics, power or details that are inherently non-instantaneous, will locate the consequences provided right here worthy in tackling a number 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

Next, near a critical pair (λ∗ , ξ ∗ ) such that ρ(λ∗ , ξ ∗ ) = 0, we may expand ρ(λ, ξ ) as a twovariable Taylor series, which is exactly a power series of the Φ(y, x) type. , the point (x = 0, y = 0)) in the C2 plane. In other words, we study how y varies near “0” with respect to an infinitesimal variation of x near “0”. Such a local study will be extremely useful in the subsequent study of the asymptotic behavior of time-delay systems. Throughout this book, we define the notation ord( · ) as follows.

What is the reason causing different structures of the root loci? The answer is related to their respective dominating partial derivatives of the quasipolynomials. 1 Leaving the detailed analysis in Chap. 1), f λ3 = 0 (1) and f τ 3 = 0 and these two quantities are the dominant factors. For f (2) (λ, τ ) given 1 This argument will be verified later in Chap. 4. 5 4 τ Re(λ) Fig. 1). a Re(λ) versus Im(λ). 5 4 τ Re(λ) Fig. 2). a Re(λ) versus Im(λ). 2 −1 0 1 2 3 4 5 τ Fig. 3). a Re(λ) versus Im(λ). 2), f λ3 = 0, f λτ = 0, and f τ 2 = 0 are the dominant factors.

3) is a quasipolynomial, it is analytical with respect to variables λ and τ . Thus, in a small neighborhood of a critical pair (λα , τα,k ), the characteristic function f (λ, τ ) can be expanded as a convergent power series of the form: f (λ, τ ) = f (λα , τα,k ) + ( f λ Δλ + f τ Δτ ) + + f λλ (Δλ)2 + 2 f λτ ΔλΔτ + f τ τ (Δτ )2 2! f λ3 (Δλ)3 + 3 f λ2 τ (Δλ)2 Δτ + 3 f λτ 2 Δλ(Δτ )2 + f τ 3 (Δτ )3 + ··· , 3! 4) where λ = λα + Δλ and τ = τα,k + Δτ . 4) is a standard two-variable Taylor expansion of f (λ, τ ).

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