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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2016.tde-25082016-094543
Document
Author
Full name
Gabriel Borelli Martins
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2016
Supervisor
Committee
Assi, Gustavo Roque da Silva (President)
Marqui Junior, Carlos de
Nader, Gilder
Title in Portuguese
Projeto de dispositivo para realização de ensaios aeroelásticos em modelos seccionais de pontes em túnel de vento.
Keywords in Portuguese
Aerodinâmica
Base elástica
Elasticidade das estruturas
Fenômenos aeroelásticos
Modelo seccional de ponte
Pontes
Túnel de vento
Vórtices dos fluídos
Abstract in Portuguese
Uma base elástica para ensaios seccionais de pontes foi projetada a partir de mancais aerostáticos. Um sistema de dois graus de liberdade foi construído, de forma a possibilitar estudos de flutter, de galloping e de vibrações induzidas por vórtices em túneis de vento. A base mostrou-se bastante versátil, permitindo diversas configurações além da inicialmente prevista, o que possibilita a realização de estudos envolvendo diferentes fenômenos aeroelásticos nos mais variados modelos. Foram realizados ensaios para a caracterização de galloping em um prisma de seção quadrada e de flutter em um fólio NACA 0020. Os resultados de galloping obtidos, considerando o escoamento incidente perpendicular a uma das faces do prisma, foram condizentes com os encontrados na literatura. Por outro lado, as derivadas de flutter obtidas nos ensaios com o fólio não foram aquelas esperadas. Ensaios complementares deverão ser realizados no futuro com o objetivo de determinar as fontes das discrepâncias observadas.
Title in English
Design of an elastic suspension system for aeroelastic studies of bridge section models in wind tunnels.
Keywords in English
Aeroelastic phenomena
Bridge section model
Elastic suspension system
Wind tunnel
Abstract in English
A new elastic suspension system using air bearings for heaving and pitching motions was designed to test section models of suspended bridges in wind tunnels. The two-degrees-of-freedom system and its versatility makes possible the study of many aeroelastic phenomena, such as galloping, vortex-induced vibrations, buffeting and flutter. Moreover, as a modular system is proposed, degrees of freedom can be easily removed or added as desired. Therefore, it can be used to study not only bridge aeroelasticity, but also fluid-structure interaction of other geometries. In order to verify the suspension system, galloping tests, using a square cylinder, and flutter tests, using a foil NACA 0020, were done at IPT's wind tunnel facility. The galloping response obtained for the square cylinder was consistent with the literature. On the other hand, the flutter derivatives obtained for the foil differ from those expected. Therefore, other investigations must be done in the future in order to identify the sources of the discrepancies observed.
 
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Publishing Date
2016-08-25
 
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