Nonparametric modeling of self-excited forces based on relations between flutter derivatives

Papinutti, Mitja (avtor), Četina, Matjaž (avtor), Brank, Boštjan (avtor)

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
• UDK: 624.04:004
• ISSN pri članku: 1226-6116
• DOI: 10.12989/was.2020.31.6.561
• COBISS.SI-ID: 44979715
• Datum objave v RUL: 04.03.2021

Gradivo je del revije

• Naslov: Wind and structures
• Skrajšan naslov: Wind Struct.
• Založnik: Techno-Press
• ISSN: 1226-6116
• COBISS.SI-ID: 961377

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