Calculation of Cutoff Frequency for Polynomial Families
Öz
If the coefficients of a polynomial depend on uncertainty parameter then a polynomial family is under consideration [1,4]. In many stability problems the investigation of pure imaginary roots for a polynomial family is very important. Given a pure imaginary complex number, the set of all images of uncertainty vectors is called the value set corresponding to this pure imaginary complex number. The question whether these sets contain the origin is very important from robust stability point of view of a polynomial family. Cutoff frequency guarantees the noninclusion of the origin to the value set for large frequencies. In this paper we give a procedure for more strict estimation of cutoff frequency and applications the obtained result to the constant inertia problem of polynomial family.
Anahtar Kelimeler
Cutoff frequency,Constant regular inertia,Multilinear polynomial families,Hurwitz stability
Kaynakça
- B. R. Barmish. New Tools for Robustness of Linear Systems. Macmillan, New York, 1994.
- H. Akyar, T. Büyükköroğlu and V. Dzhafarov, On stability of parametrized families of polynomials and matrices, Abstract and Applied Analysis, vol. 2010, Article ID 687951, 16 pages, 2010.
- L.H. Keel, Bhattacharyya S.P., Robust stability via sign-definite decomposition, IEEE Transactions on Automatic Control, 55 (11), pp. 2500-2510, 2010.
- Bhattacharyya S.P., Chapellat H. and Keel L.H., Robust Control: The Parametric Approach, Prentice Hall PTR (1995).