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

URLURL - Source URL, Visit http://dx.doi.org/10.12989/was.2020.31.6.561 This link opens in a new window

Abstract
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.

Language:English
Keywords:aerodynamic stability/instability, bridge aerodynamics, flutter, time-domain methods, wind loads
Work type:Scientific work
Typology:1.01 - Original Scientific Article
Organization:FGG - Faculty of Civil and Geodetic Engineering
Publication status:Published
Publication version:Author Accepted Manuscript
Year:2020
Number of pages:Str. 561-573
Numbering:Vol. 31, št. 6
PID:20.500.12556/RUL-125099 This link opens in a new window
UDC:624.04:004
ISSN on article:1226-6116
DOI:10.12989/was.2020.31.6.561 This link opens in a new window
COBISS.SI-ID:44979715 This link opens in a new window
Publication date in RUL:04.03.2021
Views:1265
Downloads:107
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Record is a part of a journal

Title:Wind and structures
Shortened title:Wind Struct.
Publisher:Techno-Press
ISSN:1226-6116
COBISS.SI-ID:961377 This link opens in a new window

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:04.03.2021

Secondary language

Language:Slovenian
Keywords:aerodinamična stabilnost/nestabilnost, aerodinamika mostov, omahovanje, časovne integracijske metode, vetrne obtežbe

Projects

Funder:ARRS - Slovenian Research Agency
Project number:J2-2490
Name:Podatkovno podprto modeliranje obnašanja gradbenih konstrukcij
Acronym:DataBridge

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