Full text
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| Author(s): |
Vinícius Leal Ferreira Matos
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Escola Politécnica (EP/BC) |
| Defense date: | 2001-03-26 |
| Examining board members: |
Jose Augusto Penteado Aranha;
Antonio Carlos Fernandes;
Celso Pupo Pesce
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| Advisor: | Jose Augusto Penteado Aranha |
| Abstract | |
One of the most recent concepts of deep waters fluctuant systems is the TLP platform (Tension Leg Platforms). The project critic point for this type of system is the fatigue in the tendons caused by exciting forces due to waves that act on the hull of the platform. With the aim to minimize these effects, increasing the technical and economical feasibility of this type of system, some two dimensional geometries optimized in relation to diffraction forces were proposed in the master dissertation of SIMOS (1997). These geometries could be used as transversal sections in pontoons of platforms. These sections were synthesized with the methodology proposed by ARANHA; PINTO (1994) and it is based in an analytical extension for the inertial term of the Known Morison formula, valid for all range of excitation frequencies. This formalism uses the potential theory not considering free-surfaces and viscous effects. With the intent to validate some geometries that were synthesized with the analytical process - and analyzing some effects not considered initially -, some analyzing tools were used and applied in the transversal sections proposed. Besides tank experiments, a numerical program based in variational method in infinite fluid was used, and also the program WAMIT that uses panel method. The results obtained with the differente tools were compared to assume reliability of the conclusion of this study. (AU) | |