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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.1997.tde-21052024-083317
Document
Author
Full name
André Luís Condino Fujarra
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1997
Supervisor
Committee
Pesce, Celso Pupo (President)
Aranha, Jose Augusto Penteado
Estefen, Segen Farid
Title in Portuguese
Estudo em modelo reduzido de tubo, flexível e liso, submetido ao fenômeno de Vibração Induzida pela Vorticidade (Vortex Induced Vibration)
Keywords in Portuguese
Tubos
Vibrações
Abstract in Portuguese
Experimentos com um modelo reduzido, flexível e liso, foram conduzidos com o intuito de investigar o fenômeno de Vibração Induzida pela Vorticidade - VIV. Catorze seções de um modelo tubular, verticalmente suspenso e submerso, foram instrumentadas com pares de extensômetros e, em alguns casos, um acelerômetro foi usado na extremidade inferior deste modelo. Sinais temporais de deformação foram obtidos em um intervalo de Número de Reynolds variando aproximadamente entre 6x'10POT.3' e 4x'10 POT.4'. Neste intervalo o primeiro modo natural foi excitado e os sinais, mediante algum tratamento, mostraram resultados bastante consistentes e com um quadro de histerese na porção superior da faixa de "lock-in", assim como discutido em Parra & Aranha (1996), por exemplo. O principal objetivo deste estudo foi comparar os resultados experimentais com aqueles provenientes de um método baseado no comportamento de "lock-in", método este suportado pelo modelo analítico de Iwan & Blevins, identificando a sua real condição de consistência. Outro objetivo foi analisar a correlação entre medições efetuadas ao longo do modelo ensaiado
Title in English
Untitled in english
Keywords in English
Tubes
Vibrations
Abstract in English
Experiments have been conducted with a reduced model, flexible and smooth, in order to investigate the vortex induced vibration phenomenon V.I.V..Fourteen sections of a vertically suspended submerged tube (cantilever beam) were instrumented by pairs of strain gages and in some cases na accelerometer was used at lower extremity of the model. Time histories of deformation were taken in a range of Reynolds number from approximately 6x103 to 4x104. In this range, the frist mode was excited and the obtained signals, under some treatment, showed results so consistents and with an hysteresis panorama at superior part of lock-in range, as well as discussed by Parra & Aranha (1996), for example. The mainly aim of this study was to compare experimental results with those coming from a lock-in based method, supported by V.I.V. Iwan & Blevins Model, trying to identify its real consistency. Another aim was to analyze the correlation between measurements along the experimented model.
 
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Publishing Date
2024-05-22
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • PESCE, C. P., and FUJARRA, André Luís Condino. Vortex-Induced Vibrations and Jump Phenomenon: an experimental investigation with a clamped flexible cylinder in water. International Journal of Offshore and Polar Engineering, 2000, vol. 10, nº 1, p. 26-33.
  • FUJARRA, André Luís Condino, et al. An Investigation Of Vortex-Induced Vibrations Of A Circular Cylinder In Water. In ASME Fluids Engineering Division Summer Meeting, June 21-25, 1998, Washington DC, 1998. ASME - Proccedings CDROM.N.Y : ASME, 1998.
  • FUJARRA, André Luís Condino, and PESCE, C. P. Some Remarks on Vortex-Induced Vibrations of Flexible Cylinders. In Workshop on Vortex Induced Vibrations of Offshore Structures, S.Paulo, 2000. Livro de Extended Abstracts.S. Paulo : Escola Politécnica da IUSP, 2000. Abstract. Available from: http://www.mcef.ep.usp.br/wvivos.
  • FUJARRA, André Luís Condino, PESCE, C. P., and PARRA, P. C. H. Vortex-Induced Vibration Experiments On A Flexible Cylinder. In ISOPE'98, International Offshore and Polar Engineering Conference, Montreal, 1998. Proceedings.Golden, Colorado : ISOPE, 1998.
  • FUJARRA, André Luís Condino, PESCE, C. P., e FRANCISS, Ricardo. Investigação Analítico-Numérica Sobre A Dinâmica de Tubos Verticalmente Suspensos Sujeitos À Ação do Fenômeno de Vibração Induzida Por Vorticidade. In Congreso Panamericano de Ingenieria Naval y Portuaria, Montevideo, 1997. Proceedings. : IPIN, 1997.
  • PESCE, C. P., et al. Analytical And Closed Form Solutions For Deep Water Riser-Like Eigenvalue Problem. In ISOPE'99, Brest, 1999. 9th Internacional Offshore and Polar Engineering Conference., 1999.
  • PESCE, C. P., et al. Vortex-Induced Vibrations of a Flexible Cantilever. In IUTAM Symposium on Bluff Body Wakes and Vortex-Induced Vibrations, Marseilles, France, 2000. IUTAM Symposium on Bluff Body Wakes and Vortex-Induced Vibrations., 2000. Abstract.
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