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

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.

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
Number of pages:Str. 561-573
Numbering:Vol. 31, št. 6
PID:20.500.12556/RUL-125099 This link opens in a new window
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
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Title:Wind and structures
Shortened title:Wind Struct.
COBISS.SI-ID:961377 This link opens in a new window


License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
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

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


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

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