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Warianty tytułu
Konferencja
German-Polish Workshop on Dynamical Problems in Mechanical Systems (6 ; 12-18.09.1999 ; Söllerhaus , German)
Języki publikacji
Abstrakty
The knowledge of linearized unsteady aerodynamic forces i. e. the aerodynamic transfer matrices related to small structural motion and gusts, is essential for stability analyses and to design of active flutter suppression and gust alleviation systems. The equations of motion of a flexible aircraft contain unsteady generalised aerodynamic force terms which when expressed in the Laplace domain, are transcendental functions. In practice, they are usually approximated with rational functions of the Laplace variable, which fit best a set of values of harmonic aerodynamic forces, calculated over a specified range of the frequency coefficients. In the paper, some analytical properties of the approximate aerodynamic transfer functions (in the subsonic range) are compared with exact results, obtained on the basis of numerical calculations. It will be shown, that there are some essential differences in the distribution of the singularities of transfer functions, which at high subsonic speeds may significantly delimit the accuracy of usual of usual approximations.
Słowa kluczowe
Czasopismo
Rocznik
Tom
Strony
141--153
Opis fizyczny
Bibliogr. 18 poz.
Twórcy
autor
- Institute of Fundamental Technological Research, PAS, Świętokrzyska 21, 00-049 Warsaw, Poland
Bibliografia
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWA1-0001-0992