Baza Publikacji Pracowników Politechniki Lubelskiej

Status:
Autorzy:	Warmiński Jerzy, Warmińska Anna
Wersja dokumentu:	Drukowana \| Elektroniczna
Arkusze wydawnicze:	0,5
Język:	angielski
Strony:	1 - 6
Scopus® Cytowania:	0
Bazy:	Scopus
Efekt badań statutowych	NIE
Materiał konferencyjny:	TAK
Nazwa konferencji:	ASME Design Engineering Technical Conferences and Computers and Information in Engineering Conference (DETC)
Termin konferencji:	17 sierpnia 2014 do 20 sierpnia 2014
Miasto konferencji:	Buffalo
Państwo konferencji:	STANY ZJEDNOCZONE
Publikacja OA:	NIE
Abstrakty:	angielski
	Vibrations of a nonlinear self-excited system driven by parametric and/or external excitations are studied in the paper. The model is composed of a self-excitation term represented by a nonlinear van der Pol function, periodically varied stiffness which represents parametric excitation and external harmonic force. Interactions between self and parametric or/and external force lead to complex behaviours observed by quasi-periodic or chaotic motions but under specific conditions, near resonance zones the response is harmonie. The transition from quasiperiodicity to periodic oscillations is caused by so called the frequency locking phenomenon which in fact corresponds to the second kind Hopf bifurcation (Neimark-Sacker bifurcation). The periodic resonances can be determined analytically, quasi-periodic oscillations however are imestigated mainly numerically. The goal of this paper is to determine quasi-periodic dynamics and Hopf bifurcations analytically by using the multiple time scale method (MSM) in two steps: (1) to determine periodic solutions of the fast flow by the first order MSM and (2) to determine periodic solutions of the slow-flow by the second order MSM. The analytical solutions obtained in both scales allow determining bifurcation points of the system.

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Hopf bifurcations, quasi-periodic oscillations and frequency locking zones in a self-excited system driven by parametric and external excitations

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