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Mémoire de Maîtrise
DOI
https://doi.org/10.11606/D.3.2006.tde-19092006-165959
Document
Auteur
Nom complet
Odilon Rodrigues Filho
Adresse Mail
Unité de l'USP
Domain de Connaissance
Date de Soutenance
Editeur
São Paulo, 2006
Directeur
Jury
Souza Junior, Jesse D'Assuncao Rebello de (Président)
Conti, Mardel Bongiovanni de
Neves, Marcelo de Almeida Santos
Titre en portugais
Estudo da influência do nível de alagamento sobre a estabilidade dinâmica de pesqueiros.
Mots-clés en portugais
Estabilidade de embarcações
Navio pesqueiro
Resumé en portugais
Embarcações pesqueiras representam uma parcela expressiva nas estatísticas de acidentes ocorridos no mar. Dentre estas, aquela que se destaca por impor uma perda sensível em vidas humanas é a ocorrência de emborcamentos. Quando tais embarcações passam a ser submetidas a um alagamento intermediário, sua situação de estabilidade pode ser diferente daquela prevista pela Arquitetura Naval Clássica que considera apenas efeitos estáticos. Assim, este trabalho propõe, a partir de duas simples modelagens, caracterizar o comportamento dinâmico do alagamento sob diferentes níveis e sua influência positiva ou negativa sobre a estabilidade da embarcação pesqueira realizando análises sobre o regime transiente e permanente do movimento.
Titre en anglais
On the influence of the level of flooding in the dynamic capsizing of ships.
Mots-clés en anglais
Fishing vessels
Stability of ships
Resumé en anglais
When a large compartment of a ship is flooded the water will affect the ship dynamic behaviour, and may have a significant impact on the vessel’s ability to withstand the action of waves. It is well known that complex dynamics can be associated with the loss of dynamic stability even for an intact ship, and these phenomena have been shown to be particularly relevant for fishing. We investigate here the effect of several levels of partial flooding on the dynamic processes that lead to loss of dynamic stability and capsize in waves. Two mathematical models are used in the present analysis. The first is a simplified model in which the vessel is acted upon by trains of regular beam waves. The free surface in this model is assumed to remain flat. The dynamic interaction between the vessel and the water inside it is modeled in such a way that the ensuing equations are those of a nonlinear inverted double pendulum. Drawing on this observation, an even simpler model was developed based on the idea of an equivalent mechanical pendulum. Since transient capsize in waves is a rapid phenomenon when compared to the flooding of a compartment, the analyses consider the percentage of flooding as a varying parameter.
 
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MPNVedrev.pdf (12.48 Kbytes)
Date de Publication
2006-11-17
 
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