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Time Domain Analysis Of Ship Motions And Hydrodynamic Pressures On A Ship Hull In Waves
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Book Synopsis Time-domain Analysis of Ship Motions and Hydrodynamic Pressures on a Ship Hull in Waves by :
Download or read book Time-domain Analysis of Ship Motions and Hydrodynamic Pressures on a Ship Hull in Waves written by and published by . This book was released on 1998 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes the development of a three-dimensional time-domain numerical model for calculating hull pressures as well for as hydroelastic analysis of a ship hull in waves. In this work, hydrodynamic forces & pressures due to radiated & diffracted waves are expressed as convolution products of a response function with either the velocity of ship motion or the wave elevation. The method significantly reduces the need for numerical evaluation of the time-domain Green function in the convolution of memory effects. The response functions of forces & pressures of radiated & diffracted waves are obtained by numerically solving the Fredholm integral equation of the first kind. In the equations of motion, maneuvering & rudder forces, radiation & diffraction forces, and non-linear restoring & Froude-Krylov forces are taken into account. Numerical examples are presented to compare computed & measured results.
Book Synopsis Twenty-Second Symposium on Naval Hydrodynamics by : National Research Council
Download or read book Twenty-Second Symposium on Naval Hydrodynamics written by National Research Council and published by National Academies Press. This book was released on 2000-03-02 with total page 1039 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Twenty-Second Symposium on Naval Hydrodynamics was held in Washington, D.C., from August 9-14, 1998. It coincided with the 100th anniversary of the David Taylor Model Basin. This international symposium was organized jointly by the Office of Naval Research (Mechanics and Energy Conversion S&T Division), the National Research Council (Naval Studies Board), and the Naval Surface Warfare Center, Carderock Division (David Taylor Model Basin). This biennial symposium promotes the technical exchange of naval research developments of common interest to all the countries of the world. The forum encourages both formal and informal discussion of the presented papers, and the occasion provides an opportunity for direct communication between international peers.
Book Synopsis Validation of WAVELOAD, a 3-D Frequency-domain Computer Program for Ship Motions and Hull Pressures by :
Download or read book Validation of WAVELOAD, a 3-D Frequency-domain Computer Program for Ship Motions and Hull Pressures written by and published by . This book was released on 1999 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The prediction of ship motions, sea loads, and hydrodynamic pressure distributions over a ship hull is an essential component of ship structural design. The immediate goal is to provide accurate hull pressure input for finite element structural analysis. To this end, a frequency-domain computer program (WAVELOAD), based on the three-dimensional panel-method, has been developed to predict ship motions, wave loads, and hydrodynamic pressures. The purpose of this paper is to describe the theoretical background of WAVELOAD and its experimental validation using the data from model tests with a destroyer model in head seas. Total factor error (TFE) was used as an index of correlation of predicted & measured transfer functions. TFE analysis was applied to the predictions by other computer programs (PRECAL & SHIPMO7) as well as to those by WAVELOAD. The results showed whether WAVELOAD is a reliable software package for sea-load predictions.
Book Synopsis Twenty-Third Symposium on Naval Hydrodynamics by : National Research Council
Download or read book Twenty-Third Symposium on Naval Hydrodynamics written by National Research Council and published by National Academies Press. This book was released on 2002-01-01 with total page 1024 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Vive la Revolution!" was the theme of the Twenty-Third Symposium on Naval Hydrodynamics held in Val de Reuil, France, from September 17-22, 2000 as more than 140 experts in ship design, construction, and operation came together to exchange naval research developments. The forum encouraged both formal and informal discussion of presented papers, and the occasion provides an opportunity for direct communication between international peers. This book includes sixty-three papers presented at the symposium which was organized jointly by the Office of Naval Research, the National Research Council (Naval Studies Board), and the Bassin d'Essais des Carènes. This book includes the ten topical areas discussed at the symposium: wave-induced motions and loads, hydrodynamics in ship design, propulsor hydrodynamics and hydroacoustics, CFD validation, viscous ship hydrodynamics, cavitation and bubbly flow, wave hydrodynamics, wake dynamics, shallow water hydrodynamics, and fluid dynamics in the naval context.
Book Synopsis Twenty-First Symposium on Naval Hydrodynamics by : National Research Council
Download or read book Twenty-First Symposium on Naval Hydrodynamics written by National Research Council and published by National Academies Press. This book was released on 1997-09-11 with total page 1100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Time-domain Simulation of Nonlinear Ship Motions and Wave Loads by :
Download or read book Time-domain Simulation of Nonlinear Ship Motions and Wave Loads written by and published by . This book was released on 1999 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the assessment of the ability of a ship structure to withstand specified sea environments with an acceptable risk of failure, accurately predicted loads are vital. Of paramount importance are extreme loads on the hull structure, which usually occur when a ship undergoes large heaving & pitching motions in rough seas, sometimes accompanied by impacts between the bow & waves. This paper describes the application of strip theory to time domain calculations of non-linear ship motions and hull-girder loads in head seas. In this approach, the differential equations of ship motion are solved numerically by calculating hydrodynamic forces & coefficients at each time step by strip theory, taking into account nonlinearities relating to large relative motion between waves & the ship hull. The results indicate the usefulness of this approach compared to the conventional linear frequency-domain approach.
Book Synopsis Twenty-Fourth Symposium on Naval Hydrodynamics by : National Research Council
Download or read book Twenty-Fourth Symposium on Naval Hydrodynamics written by National Research Council and published by National Academies Press. This book was released on 2003-11-15 with total page 1018 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is part of a series of reports that summarize this regular event. The report discusses research developments in ship design, construction, and operation in a forum that encouraged both formal and informal discussion of presented papers.
Book Synopsis Time-domain Simulation of Wave-induced Ship Motions by a Rankine Panel Method by : Junshi Wang
Download or read book Time-domain Simulation of Wave-induced Ship Motions by a Rankine Panel Method written by Junshi Wang and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, a numerical program has been developed to simulate the wave-induced ship motions in the time domain. Wave-body interactions have been studied for various ships and floating bodies through forced motion and free motion simulations in a wide range of wave frequencies. A three-dimensional Rankine panel method is applied to solve the boundary value problem for the wave-body interactions. The velocity potentials and normal velocities on the boundaries are obtained in the time domain by solving the mixed boundary integral equations in relation to the source and dipole distributions. The hydrodynamic forces are calculated by the integration of the instantaneous hydrodynamic pressures over the body surface. The equations of ship motion are solved simultaneously with the boundary value problem for each time step. The wave elevation is computed by applying the linear free surface conditions. A numerical damping zone is adopted to absorb the outgoing waves in order to satisfy the radiation condition for the truncated free surface. A numerical filter is applied on the free surface for the smoothing of the wave elevation. Good convergence has been reached for both forced motion simulations and free motion simulations. The computed added-mass and damping coefficients, wave exciting forces, and motion responses for ships and floating bodies are in good agreement with the numerical results from other programs and experimental data.
Book Synopsis Hydroelasticity of Ships by : Richard Evelyn Donohue Bishop
Download or read book Hydroelasticity of Ships written by Richard Evelyn Donohue Bishop and published by Cambridge University Press. This book was released on 1979-12-27 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Good,No Highlights,No Markup,all pages are intact, Slight Shelfwear,may have the corners slightly dented, may have slight color changes/slightly damaged spine.
Book Synopsis Three Dimensional Time Domain Simulation of Ship Motions and Loads in Large Amplitude Head Waves by : Olgun Guven Hizir
Download or read book Three Dimensional Time Domain Simulation of Ship Motions and Loads in Large Amplitude Head Waves written by Olgun Guven Hizir and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This PhD thesis presents the development of a practical computational tool named Large Amplitude RESponse (LARes), based on 3D quasi-non-linear time-domain technique, to predict ship motions and loads in large amplitude waves which can be accessible to ship designers. Firstly, a linear 3-D Green source panel code (LARes L1) was developed to perform linear time-domain analysis ship motion and internal load simulations based on the frequency-domain hydrodynamic coefficients which were calculated in the linear PRECAL software. Linear simulations are validated with the linear time-domain PRETTI software results using rectangular barge geometry. The motions, internal loads, global and sectional hydrodynamic forces were agreed well with the linear PRETTI model results in zero and forward speed simulations. Then, non-linear time-domain panel code (LARes L2) was developed in order to predict ship motions and loads in large amplitude waves using the Froude-Krylov nonlinearity level. At each time step, the exact wetted area of the ship surface under the wave profile was calculated and fed in the time-domain motion and load equations while the diffraction and radiation forces were kept as linear. The present program achieved good agreement with the non-linear PRETTI model results both for the barge and S175 container geometries at zero and forward speed conditions in small amplitude waves. Moreover, the S175 container ship results are compared with the available experimental data and agreed well with the experimental results in forward speed case. It has been observed that PRETTI code is over-estimating motion and load responses especially around the resonant frequency due to the surge motion influence in the memory forces evaluations. In the Froude-Krylov nonlinear level predictions, it has been observed that PRETTI diverges from the experimental results when the wave steepness is higher than 0.08 due to the linear radiation and diffraction forces. Based on the same framework, a more advanced nonlinear time-domain panel code (LARes L3) was developed in order to investigate the effects of quasi-non-linear diffraction and radiation forces in large amplitude ship simulations. A new mesh generator was introduced in order to cut and correct the original panels under the still water level in the updated position of the ship after displacements and rotations. The quasi-non-linear diffraction and radiation forces were calculated at the pre-defined position cases and stored in a database. In order to lower the computational cost multi-dimensional integration and interpolation codes were generated. The S-175 containership was tested in 120 different position cases and resulting hydrodynamic coefficients and forces were stored in the database. The results of the LARes L3 model were compared with the available experimental data using the S-175 containership in forward speed. The computed motion responses showed a good agreement with the experimental data. Moreover, three of the developed models are compared with the experiments and their performances were investigated with respect to the increasing wave slope. In addition to that, the effect of the wave length and ship speed in large amplitude waves are investigated in detail. Non-linear behaviors of the codes were compared with the experimental results which showed a good agreement. Finally, the Vertical Shear Force (VSF) and Vertical Bending Moment (VBM) responses were investigated in large amplitude motions. It was observed that, in the validation section, numerical model peak amplitudes showed well agreement with the experimental results, but they were observed to be shifted to the higher frequencies compared to the experimental results. The reason for that was attributed to the longitudinal mass distribution on the ship in the experimental setup which had not been provided in detail in the published experimental results.
Book Synopsis Hydrodynamic Forces and Motions in the Time Domain for an Unappended Ship Hull by : Kevin A. McTaggart
Download or read book Hydrodynamic Forces and Motions in the Time Domain for an Unappended Ship Hull written by Kevin A. McTaggart and published by . This book was released on 2003 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Large-amplitude ship motions in the time domain by : Allan R. Magee
Download or read book Large-amplitude ship motions in the time domain written by Allan R. Magee and published by . This book was released on 1991 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of time-domain analysis of predicting ship motions is investigated. In the method, the hydrodynamic problem is solved directly in the time domain as an initial value problem starting from rest rather than using the more conventional frequency-domain formulation.
Book Synopsis Water Waves and Ship Hydrodynamics by : A.J. Hermans
Download or read book Water Waves and Ship Hydrodynamics written by A.J. Hermans and published by Springer Science & Business Media. This book was released on 2010-10-21 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book an introduction is given to aspects of water waves that play a role in ship hydrodynamics and offshore engineering. At first the equations and linearized boundary conditions are derived describing the non-viscous free surface water waves, with special attention to the combination of steady and non-steady flow fields. Then some simple kinds of free wave solutions are derived, such as plane waves and cylindrical waves. For several situations, steady and unsteady, the source singularity function is derived. These functions play a role in numerical codes used to describe the motion of ships and offshore structures. These codes are mostly based on a boundary integral formulation; therefore we give an introduction to these methods. It is shown how first order ship motions can be determined. In offshore engineering the second order wave drift motions play an important role. An introduction to this phenomenon is given and the effects which have to be taken into account are explained by means of a simple example where we can determine nearly all the aspects analytically. An interesting example that is worked out is the motion of very large floating flexible platforms with finite draft. Finally an introduction to the theory of shallow water non-linear dispersive waves is presented, and shallow water ship hydrodynamics, that plays a role in coastal areas and channels is treated. Here attention is paid to the interaction between passing ships in restricted water. In the appendix a short introduction to some of the mathematical tools is given.
Book Synopsis Stability and Seakeeping of Marine Vessels by : Ermina Begovic
Download or read book Stability and Seakeeping of Marine Vessels written by Ermina Begovic and published by Mdpi AG. This book was released on 2021-08-30 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the papers accepted into the Special Issue "Stability and Seakeeping of Marine Vessels" and includes nine contributions to this Special Issue published in 2020. The overall aim of the collection is to improve knowledge about the most relevant and recent topics in ship stability and seakeeping. Specifically, the articles cover a wide range of topics and reflect the recent scientific efforts in the 2nd generation intact stability criteria evaluation and modelling of the ship dynamics assessment in intact or damaged conditions. These topics were investigated mainly through direct assessments performed both via numerical methods and tools, and experimental approaches. The book is addressed to individuals from universities, research organizations, industry, government agencies and certifying authorities, as well as designers, operators and owners who contribute to improved knowledge about "stability and seakeeping".
Book Synopsis Sea Loads on Ships and Offshore Structures by : O. Faltinsen
Download or read book Sea Loads on Ships and Offshore Structures written by O. Faltinsen and published by Cambridge University Press. This book was released on 1993-09-23 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: After introducing the theory of the structural loading on ships and offshore structures based on the motions of wind, waves and currents, this text demonstrates its applications to conventional and non-conventional sea vessels, including extensive exercises and examples.
Book Synopsis The Hydrodynamic Forces and Ship Motions in Waves by : Jan Hendrik Vugts
Download or read book The Hydrodynamic Forces and Ship Motions in Waves written by Jan Hendrik Vugts and published by . This book was released on 1970 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrodynamics of High-Speed Marine Vehicles by : Odd M. Faltinsen
Download or read book Hydrodynamics of High-Speed Marine Vehicles written by Odd M. Faltinsen and published by Cambridge University Press. This book was released on 2006-01-09 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrodynamics of High-Speed Marine Vehicles, first published in 2006, discusses the three main categories of high-speed marine vehicles - vessels supported by submerged hulls, air cushions or foils. The wave environment, resistance, propulsion, seakeeping, sea loads and manoeuvring are extensively covered based on rational and simplified methods. Links to automatic control and structural mechanics are emphasized. A detailed description of waterjet propulsion is given and the effect of water depth on wash, resistance, sinkage and trim is discussed. Chapter topics include resistance and wash; slamming; air cushion-supported vessels, including a detailed discussion of wave-excited resonant oscillations in air cushion; and hydrofoil vessels. The book contains numerous illustrations, examples and exercises.
