Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Three Dimensional Time Domain Simulation Of Ship Motions And Loads In Large Amplitude Head Waves
Download Three Dimensional Time Domain Simulation Of Ship Motions And Loads In Large Amplitude Head Waves full books in PDF, epub, and Kindle. Read online Three Dimensional Time Domain Simulation Of Ship Motions And Loads In Large Amplitude Head Waves ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
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 2015 with total page 442 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 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 Time-domain Simulation of Large-amplitude Ship Motions Including Capsizing by : Tuanjie Liu
Download or read book Time-domain Simulation of Large-amplitude Ship Motions Including Capsizing written by Tuanjie Liu and published by . This book was released on 2002 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Numerical Simulation of Large Amplitude Ship Motions by : Shukui Liu
Download or read book Numerical Simulation of Large Amplitude Ship Motions written by Shukui Liu and published by LAP Lambert Academic Publishing. This book was released on 2012-04 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reliable prediction of the seakeeping behavior of ships in real seas is a demanding task for naval architects and of great interest to ship owners/operators, as it affects both the design and operation of ships. In this work, a set of methods, namely, a time domain transient Green function solver, alternatively a time domain hybrid solver for zero speed problems and the adopted hybrid solver for nonzero forward speed problem, are developed to study the seakeeping behavior of ships and floating structures in waves. Validation cases cover both simple mathematical geometries and practical ship hulls, either without or with forward speed. Obtained results include radiation/diffraction forces, wave making resistance, motion simulation and added resistance (drift force). It is proved that by properly selecting a solver the developed package is capable of simulating large amplitude motions of ships or floating structures in waves thus it can serve as an advanced tool for the assessment of ship design and operation. This work is expected to offer researchers in similar field a state of art review of the problem and certain amount of inspiration in terms of numerical implementation.
Book Synopsis Time domain simulation of ship motions in waves by : Edward John Ballard
Download or read book Time domain simulation of ship motions in waves written by Edward John Ballard and published by . This book was released on 2002 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Trends and Challenges in Maritime Energy Management by : Aykut I. Ölçer
Download or read book Trends and Challenges in Maritime Energy Management written by Aykut I. Ölçer and published by Springer. This book was released on 2018-05-03 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an overview of contemporary trends and challenges in maritime energy management (MEM). Coordinated action is necessary to achieve a low carbon and energy-efficient maritime future, and MEM is the prevailing framework aimed at reducing greenhouse gas emissions resulting from maritime industry activities. The book familiarizes readers with the status quo in the field, and paves the way for finding solutions to perceived challenges. The 34 contributions cover six important aspects: regulatory framework; energy-efficient ship design; energy efficient ship and port operation; economic and social dimensions; alternative fuels and wind-assisted ship propulsion; and marine renewable energy. This pioneering work is intended for researchers and academics as well as practitioners and policymakers involved in this important field.
Book Synopsis Model Testing and Numerical Simulations of Seakeeping Performance for High-Speed Vessels by :
Download or read book Model Testing and Numerical Simulations of Seakeeping Performance for High-Speed Vessels written by and published by . This book was released on 2004 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Time Domain Mathematical Model for Six-degree-of-freedom Motion in a Wave by : Joonyun Kang
Download or read book Time Domain Mathematical Model for Six-degree-of-freedom Motion in a Wave written by Joonyun Kang and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: To assess the behaviour of a ship in a seaway, this thesis presents the development of an integrated mathematical model describing a six-degree-of-freedom motion of a ship in a wave. This integrated mathematical model is developed with its fundamental base on both traditional seakeeping and manoeuvring theories and thus obtaining of hydrodynamic data sets as well as formulation of force component are needed in a theoretical manner. To obtain the hydrodynamic data sets, theoretical formulations and numerical implementations are carried out for a ship travelling in a wave. The theoretical formulation of three-dimensional potential flow leads boundary integral equations over mean wetted body surface with three-dimensional translating pulsating Green function. For numerical implementation Constant Panel Method and Higher-Order Panel Method are introduced as distribution technique of source singularities over the idealised body surface and compared for the estimation of hydrodynamic data set of Wigley and Todd Series 60. Mean second-order wave forces are formulated based on the solution of first-order problem and obtained by direct pressure integration over mean wetted body surface. The effects of forward speed and wave heading on the drift force and added resistance are investigated and compare with experimental data. An integrated mathematical model for manoeuvring motion is further developed with functional form of memory effect represented by convolution integrals of impulse response function to describe arbitrary ship motion in a seaway. For validation of developed numerical tool, benchmark tests have been performed for the prediction of large amplitude ship motion in following seas. Standard manoeuvring tests, turning circle and zig-zag manoeuvres, are presented to demonstrate the wave effects on the manoeuvring performance. The capability of numerical tool has been extended to the prediction of highly non-linear behaviours of parametric rolling phenomenon in longitudinal wave with reasonable accuracy.
Book Synopsis A Time Domain Simulation of Ship Motions in Waves by :
Download or read book A Time Domain Simulation of Ship Motions in Waves written by and published by . This book was released on 1988 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Time Domain Simulation of Hydroelastic Response of Ships in Large Amplitude Waves by : Jae-Hong Park
Download or read book Time Domain Simulation of Hydroelastic Response of Ships in Large Amplitude Waves written by Jae-Hong Park and published by . This book was released on 2006 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
