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Design and analysis of hybrid titanium-composite hull structures under extreme wave and slamming loadsUnknown Date (has links)
A finite element tool has been developed to design and investigate a multi-hull
composite ship structure, and a hybrid hull of identical length and beam. Hybrid hull
structure is assembled by Titanium alloy (Ti-6Al-4V) frame and sandwich composite
panels. Wave loads and slamming loads acting on both hull structures have been
calculated according to ABS rules at sea state 5 with a ship velocity of 40 knots.
Comparisons of deformations and stresses between two sets of loadings demonstrate that
slamming loads have more detrimental effects on ship structure. Deformation under
slamming is almost one order higher than that caused by wave loads. Also, Titanium
frame in hybrid hull significantly reduces both deformation and stresses when compared
to composite hull due to enhancement of in plane strength and stiffness of the hull.
A 73m long hybrid hull has also been investigated under wave and slamming loads in time
domain for dynamic analysis. / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2013.
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On the diffraction of free surface waves by a slender shipSclavounos, Paul D. January 1981 (has links)
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1981. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Bibliography: leaves 124-126. / by Paul Sclavounos. / Ph.D.
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Sediment dynamics on the shore slopes of the Puget Island reach of the Columbia River, Oregon and WashingtonAbbe, Timothy 01 January 1989 (has links)
Water waves generated by wind and ships; ebb tidal currents; water level fluctuations; and dredging impact sediment transport in shallow water of the lower Columbia River. Observations were made over a one-year period after sand dredged from the navigation channel was placed at three study sites in the Puget Island region, 46°15'N 123°25'W, Oregon and Washington. Sediment composition is fine to medium grained, low density dacitic volcanics with small percentages of pumice, heavy minerals, and basalt.
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Los Angeles-Long Beach Harbor Pier 400 harbor resonance study using numerical model, CGWAVE /Li, Dongcheng, January 2002 (has links)
Thesis (M.S.) in Mechanical Engineering--University of Maine, 2002. / Includes vita. Includes bibliographical references (leaves 46-49).
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Mass transport due to surface waves in a water-mud systemHuang, Lingyan., 黃凌燕. January 2005 (has links)
published_or_final_version / abstract / Mechanical Engineering / Doctoral / Doctor of Philosophy
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Rainfall runoff model improvements incorporating a dynamic wave model and synthetic stream networks /Cui, Gurong. January 1999 (has links)
Thesis (Ph. D.)--University of Newcastle, 1999. / Department of Civil, Surveying and Environmental Engineering. Includes bibliographical references (leaves 246-255). Also available online.
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Wave energy converter performance modeling and cost of electricity assessment a thesis /Jarocki, Dmitri. Crockett, Robert S. January 1900 (has links)
Thesis (M.S.)--California Polytechnic State University, 2010. / Title from PDF title page; viewed on May 15, 2010. Major professor: Robert S. Crockett, Ph.D. "Presented to the faculty of California Polytechnic State University, San Luis Obispo." "In partial fulfillment of the requirements for the degree [of] Master of Science in Engineering." "March 2010." Includes bibliographical references (p. 64-65).
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Interação de ondas aquáticas com obstáculos quase circulares finos e submersosGama, Rômulo Lima da January 2015 (has links)
A força hidrodinâmica em termos dos coeficientes de massa adicional e amortecimento, para obstáculos aproximadamente circulares, finos e submersos sob uma superfície livre aquática, é calculada numericamente usando um método espectral. Primeiramente, é apresentado um modelo matemático para ondas aquáticas de superfície e em seguida, o problema de difração de ondas devido à presença de um obstáculo é descrito. Quando o obstáculo é submerso e fino, o problema pode ser formulado em termos de uma equação integral hipersingular. Usando um mapeamento conforme sobre um disco circular, é mostrado que a solução pode ser obtida através de um método espectral onde a hipersingularidade é avaliada analiticamente em termos de polinômios ortogonais. Os coeficientes da força hidrodinâmica, em função do número de onda, são obtidos para obstáculos quase circulares. A ocorrência de frequências ressoantes ´e observada para submersões suficientemente pequenas e subpicos de ressonância aparecem para valores moderados da submersão, em comparação com o caso do disco circular. / The hydrodynamic force, in terms of the added mass and damping coefficients, for thin and submerged nearly circular obstacles below a water free surface is computed by a spectral method. Firstly, a mathematical model for surface water waves is presented. Next, the diffraction problem of waves due to the presence of an obstacle is described. When the body is thin and submerged, the problem can be formulated in terms of a hypersingular integral equation. Using a conformal mapping over a circular disc, it is shown that the solution can be obtained by means of a spectral method where the hipersingularity is analytically evaluated in terms of orthogonal polynomials. The hydrodynamics coefficients, in function of the wavenumber, are computed and shown for nearly circular obstacles. The occurrence of resonant frequencies is observed for sufficiently small submergences and subpeaks of resonances appear for moderate values of the submergence, in comparison with the case of a circular disc.
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Interação de ondas aquáticas com obstáculos quase circulares finos e submersosGama, Rômulo Lima da January 2015 (has links)
A força hidrodinâmica em termos dos coeficientes de massa adicional e amortecimento, para obstáculos aproximadamente circulares, finos e submersos sob uma superfície livre aquática, é calculada numericamente usando um método espectral. Primeiramente, é apresentado um modelo matemático para ondas aquáticas de superfície e em seguida, o problema de difração de ondas devido à presença de um obstáculo é descrito. Quando o obstáculo é submerso e fino, o problema pode ser formulado em termos de uma equação integral hipersingular. Usando um mapeamento conforme sobre um disco circular, é mostrado que a solução pode ser obtida através de um método espectral onde a hipersingularidade é avaliada analiticamente em termos de polinômios ortogonais. Os coeficientes da força hidrodinâmica, em função do número de onda, são obtidos para obstáculos quase circulares. A ocorrência de frequências ressoantes ´e observada para submersões suficientemente pequenas e subpicos de ressonância aparecem para valores moderados da submersão, em comparação com o caso do disco circular. / The hydrodynamic force, in terms of the added mass and damping coefficients, for thin and submerged nearly circular obstacles below a water free surface is computed by a spectral method. Firstly, a mathematical model for surface water waves is presented. Next, the diffraction problem of waves due to the presence of an obstacle is described. When the body is thin and submerged, the problem can be formulated in terms of a hypersingular integral equation. Using a conformal mapping over a circular disc, it is shown that the solution can be obtained by means of a spectral method where the hipersingularity is analytically evaluated in terms of orthogonal polynomials. The hydrodynamics coefficients, in function of the wavenumber, are computed and shown for nearly circular obstacles. The occurrence of resonant frequencies is observed for sufficiently small submergences and subpeaks of resonances appear for moderate values of the submergence, in comparison with the case of a circular disc.
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Interação de ondas aquáticas com obstáculos quase circulares finos e submersosGama, Rômulo Lima da January 2015 (has links)
A força hidrodinâmica em termos dos coeficientes de massa adicional e amortecimento, para obstáculos aproximadamente circulares, finos e submersos sob uma superfície livre aquática, é calculada numericamente usando um método espectral. Primeiramente, é apresentado um modelo matemático para ondas aquáticas de superfície e em seguida, o problema de difração de ondas devido à presença de um obstáculo é descrito. Quando o obstáculo é submerso e fino, o problema pode ser formulado em termos de uma equação integral hipersingular. Usando um mapeamento conforme sobre um disco circular, é mostrado que a solução pode ser obtida através de um método espectral onde a hipersingularidade é avaliada analiticamente em termos de polinômios ortogonais. Os coeficientes da força hidrodinâmica, em função do número de onda, são obtidos para obstáculos quase circulares. A ocorrência de frequências ressoantes ´e observada para submersões suficientemente pequenas e subpicos de ressonância aparecem para valores moderados da submersão, em comparação com o caso do disco circular. / The hydrodynamic force, in terms of the added mass and damping coefficients, for thin and submerged nearly circular obstacles below a water free surface is computed by a spectral method. Firstly, a mathematical model for surface water waves is presented. Next, the diffraction problem of waves due to the presence of an obstacle is described. When the body is thin and submerged, the problem can be formulated in terms of a hypersingular integral equation. Using a conformal mapping over a circular disc, it is shown that the solution can be obtained by means of a spectral method where the hipersingularity is analytically evaluated in terms of orthogonal polynomials. The hydrodynamics coefficients, in function of the wavenumber, are computed and shown for nearly circular obstacles. The occurrence of resonant frequencies is observed for sufficiently small submergences and subpeaks of resonances appear for moderate values of the submergence, in comparison with the case of a circular disc.
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