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Nonparametric modeling of self-excited forces based on relations between flutter derivatives
ID Papinutti, Mitja (Avtor), ID Četina, Matjaž (Avtor), ID Brank, Boštjan (Avtor)

URLURL - Izvorni URL, za dostop obiščite http://dx.doi.org/10.12989/was.2020.31.6.561 Povezava se odpre v novem oknu

Izvleček
Unsteady self-excited forces are commonly represented by parametric models such as rational functions. However, this requires complex multiparametric nonlinear fitting, which can be a challenging task that requires knowhow. This paper explores the alternative nonparametric modeling of unsteady self-excited forces based on relations between flutter derivatives. By exploiting the properties of the transfer function of linear causal systems, we show that damping and stiffness aerodynamic derivatives are related by the Hilbert transform. This property is utilized to develop exact simplified expressions, where it is only necessary to consider the frequency dependency of either the aeroelastic damping or stiffness terms but not both simultaneously. This approach is useful if the experimental data on aerodynamic derivatives that are related to the damping are deemed more accurate than the data that are related to the stiffness or vice versa. The proposed numerical models are evaluated with numerical examples and with data from wind tunnel experiments. The presented method can evaluate any continuous fitted table of interpolation functions of various types, which are independently fitted to aeroelastic damping and stiffness terms. The evaluation results demonstrate that the proposed methodology performs very well and that the relations between the flutter derivatives can be used to improve the modeling of aerodynamic self-excited forces for bridge decks.

Jezik:Angleški jezik
Ključne besede:aerodynamic stability/instability, bridge aerodynamics, flutter, time-domain methods, wind loads
Vrsta gradiva:Znanstveno delo
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FGG - Fakulteta za gradbeništvo in geodezijo
Status publikacije:Objavljeno
Različica publikacije:Recenzirani rokopis
Leto izida:2020
Št. strani:Str. 561-573
Številčenje:Vol. 31, št. 6
PID:20.500.12556/RUL-125099 Povezava se odpre v novem oknu
UDK:624.04:004
ISSN pri članku:1226-6116
DOI:10.12989/was.2020.31.6.561 Povezava se odpre v novem oknu
COBISS.SI-ID:44979715 Povezava se odpre v novem oknu
Datum objave v RUL:04.03.2021
Število ogledov:1356
Število prenosov:107
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Gradivo je del revije

Naslov:Wind and structures
Skrajšan naslov:Wind Struct.
Založnik:Techno-Press
ISSN:1226-6116
COBISS.SI-ID:961377 Povezava se odpre v novem oknu

Licence

Licenca:CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
Opis:Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.
Začetek licenciranja:04.03.2021

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:aerodinamična stabilnost/nestabilnost, aerodinamika mostov, omahovanje, časovne integracijske metode, vetrne obtežbe

Projekti

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:J2-2490
Naslov:Podatkovno podprto modeliranje obnašanja gradbenih konstrukcij
Akronim:DataBridge

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