Stochastic and deterministic interaction among eigen-modes of a structure exposed to random excitation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F19%3A00506016" target="_blank" >RIV/68378297:_____/19:00506016 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Stochastic and deterministic interaction among eigen-modes of a structure exposed to random excitation

Original language description

The paper investigates the influence of both stochastic and deterministic interactions of eigen-modes on the along random response of slender structures exposed to the wind. The stochastic interaction originates from spatial distribution and correlation of the random wind excitation along the structure. The latter interaction i.e. deterministic is caused by application of non-classical damping, e.g., due to the presence of vibration absorber. The random excitation is expressed by means of the spectral density function, which characterizes the wind pressure fluctuation. The stationary Gaussian character of the excitation processes enables to express the general solution of the response in terms of stationary solution using correlation matrix in generalized coordinates. The off-diagonal elements of the response correlation matrix in the modal space provide the information about the level of general interaction among particular eigen-modes. A large number of numerical simulations was carried out on a computational model of a real tower with the vibration absorber in order to quantitatively and qualitatively determine the differences between responses obtained by conventional method and procedure recently proposed. Influence of stochastic and dynamic interactions to these differences were determined for various damping ratios of the absorber. The results obtained indicate certain underestimation of the vibration level due to the deterministic and stochastic interactions neglecting.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20101 - Civil engineering

Project

<a href="/en/project/GA19-21817S" target="_blank" >GA19-21817S: Nonholonomic interaction and dynamical stability of aeroelastic systems</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

COMPDYN Proceedings. 7th International Conference on Computational Methods in Structural Dynamics and Earthquake

ISBN

978-618828446-3

ISSN

2623-3347

e-ISSN

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Number of pages

13

Pages from-to

808-820

Publisher name

National Technical University of Athens

Place of publication

Atheny

Event location

Hersonissos

Event date

Jun 24, 2019

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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