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Stability of two-degrees-of-freedom aero-elastic models with frequency and time variable parametric self-induced forces
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SYSNO ASEP 0447164 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Stability of two-degrees-of-freedom aero-elastic models with frequency and time variable parametric self-induced forces Author(s) Náprstek, Jiří (UTAM-F) RID, ORCID, SAI
Pospíšil, Stanislav (UTAM-F) RID, SAI, ORCID
Yau, J. D. (TW)Number of authors 3 Source Title Journal of Fluids and Structures. - : Elsevier - ISSN 0889-9746
Roč. 57, August (2015), s. 91-107Number of pages 17 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords aero-elastic system ; self-excited vibration ; dynamic stability ; Routh–Hurwitz conditions ; flutter derivatives ; divergence Subject RIV JM - Building Engineering R&D Projects LO1219 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GC13-34405J GA ČR - Czech Science Foundation (CSF) Institutional support UTAM-F - RVO:68378297 UT WOS 000361403500007 EID SCOPUS 84939856893 DOI 10.1016/j.jfluidstructs.2015.05.010 Annotation The lowest critical state of slender systems representing long suspension bridges can be investigated using two degree of freedom linear models.Initially,the neutral model with aero-elastic forces treated as constants can be used and such approach works well on the theoretical level.However,because time dependency is neglected,it is naturally limited to the very close neighborhood of the bifurcation point.Thus,an approach using aero- elastic coefficients known as flutter derivatives was introduced in the past.The present paper combines these models together on one common basis and establishes linkage to avoid the time–frequency duality.The stability limits are analysed by means of the generalized Routh–Hurwitz approach and Liénard theorems. Some examples of bridge stability analyses are provided using experimentally ascertained or literature based data. Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2016
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