Download or read book Recent Developments and Applications of the Strip Theory to Calculate Ship Motions written by J. Gerritsma and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of the Modified Strip Theory for the Calculation of Ship Motions and Wave Bending Moments written by J. Gerritsma and published by . This book was released on 1967 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Ship Motions and Drag Reduction written by Johannes Krzywinski Lunde and published by . This book was released on 1966 with total page 1182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Rational Strip Theory of Ship Motions written by T. Francis Ogilvie and published by . This book was released on 1969 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: The exact ideal-fluid boundary-value problem is formulated for a ship forced to heave and pitch sinusoidally in otherwise calm water. This problem is then simplified by applying three restrictions: (1) the body must be slender; (2) the motions must be small in amplitude compared with ship beam or draft; (3) the frequency of oscillation must be high. The hydrodynamic problem is then recast as a singular perturbation problem which is solved by the method of matched asymptotic expansions. Formulas are derived for the hydrodynamic heave force and pitch moment, from which added-mass and damping coefficients can be easily obtained. The latter are similar but not identical to those used in several other versions of 'strip theory;' in particular, the forward-speed effects have the symmetry required by the theorem of Timman and Newman, a result which has not been realized in previous versions of strip theory. In order to calculate the coefficients by the formulas derived, it is necessary to solve numerically a set of boundary-value problems in two dimensions, namely, the problem of a cylinder oscillating vertically in the free surface. At least two practical procedures are available for this purpose. (Author).
Download or read book Numerical Methods for Seakeeping Problems written by Bettar O. el Moctar and published by Springer. This book was released on 2021-02-18 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book describes currently applied and newly developed advanced numerical methods for wave-induced ship motions and loads. Besides well-established computational methods based on strip theory, panel methods and finite volume methods for unsteady Reynolds-averaged Navier-Stokes equations (URANS), recent advances like a fully nonlinear Rankine panel method, URANS calculations including elastic hull deformations, and an improved method to predict added resistance in waves are explained in detail. Furthermore, statistical methods to assess extreme motions and loads are described both for linear and nonlinear responses in a stationary seaway as well as during long-term ship operations. Results of motions and loads, computed using the various methods, are compared with each other and with results of model experiments. Introductory chapters on fluid dynamics, motions of rigid and elastic ship hulls, numerical methods to compute fluid flows associated with wind waves, and the development and simulation of seaways complement the volume. The book will be of interest to post-graduate students, PhD candidates, as well as engineers in the field of naval architecture, ocean, and marine engineering.
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.
Download or read book Calculations of Struck ship Motions by Using the Cummins Equations with Strip Theory Potential Coefficients written by and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Improved Strip Theory Program for Ship Motions and Sea Loads in Waves written by and published by . This book was released on 1997 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes enhancements to the strip theory program SHIPMO, with the goal of producing a robust code for predicting both ship motions and sea loads in waves. A new boundary element method was introduced which eliminates irregular frequencies of sectional hydrodynamic coefficients. Problems with predictions at low encounter frequencies are circumvented with a new extrapolation scheme. These improvements remove two sources of potentially large errors for predicted motions and sea loads. A new added resistance capability uses two different near-field methods for short and long wavelength regimes. Motion and sea load predictions include appendage and viscous forces for the lateral plane. Validation results for a warship are presented showing degree of agreement of predicted motions and sea loads with experiments.
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:
Download or read book A Rational Strip Theory of Ship Motions written by Odd Magnus Faltinsen and published by . This book was released on 1971 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: The exact ideal-fluid boundary-value problem is formulated for the diffraction of head-sea regular waves by a restrained ship. The problem is then simplified by applying four restrictions. The problem is solved by using matched asymptotic expansions. The result shows that the wave is attenuated as it propagates along the ship. The result is not expected to be valid near the bow or stern of the ship. The pressure distribution and force distribution along a ship model with circular cross-sections were calculated. The total force on the ship was compared with the value predicted by the Khaskind relation. The agreement is good. The experimental and theoretical pressure distribution along a prolate spheroid was compared. The predicted attenuation of the peak pressure is very well confirmed by the experiments. In addition, theory and experiment agree that the peak pressure near the ship generally leads the Froude-Kriloff pressure peak by 45 degrees. (Author).
Download or read book SHIPMO7 written by Kevin A. McTaggart and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This manual describes a new version of the ship motion program SHIPMO, called SHIPMO7. The new version introduces several improvements over previous versions. A new boundary element method for computing sectional hydrodynamic coefficients eliminates problems with irregular frequencies. The revised program computes sea loads, including appendage forces and viscous forces, with special attention to the consistent treatment of forces acting on the ship during both motion and load predictions. The program also has revised input and output format to improve consistency and clarity. SHIPMO7 also gives derived responses, including local accelerations, slamming, deck wetness, motion-induced interruptions, and added resistance in waves. Information is included on running the program, and sample inputs and outputs are appended.
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.
Download or read book The Maritime Engineering Reference Book written by Anthony F. Molland and published by Elsevier. This book was released on 2011-10-13 with total page 921 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Maritime Engineering Reference Book is a one-stop source for engineers involved in marine engineering and naval architecture. In this essential reference, Anthony F. Molland has brought together the work of a number of the world's leading writers in the field to create an inclusive volume for a wide audience of marine engineers, naval architects and those involved in marine operations, insurance and other related fields. Coverage ranges from the basics to more advanced topics in ship design, construction and operation. All the key areas are covered, including ship flotation and stability, ship structures, propulsion, seakeeping and maneuvering. The marine environment and maritime safety are explored as well as new technologies, such as computer aided ship design and remotely operated vehicles (ROVs).Facts, figures and data from world-leading experts makes this an invaluable ready-reference for those involved in the field of maritime engineering.Professor A.F. Molland, BSc, MSc, PhD, CEng, FRINA. is Emeritus Professor of Ship Design at the University of Southampton, UK. He has lectured ship design and operation for many years. He has carried out extensive research and published widely on ship design and various aspects of ship hydrodynamics.* A comprehensive overview from best-selling authors including Bryan Barrass, Rawson and Tupper, and David Eyres* Covers basic and advanced material on marine engineering and Naval Architecture topics* Have key facts, figures and data to hand in one complete reference book
Download or read book SHIPMO6 an Updated Strip Theory Ship Motion Program written by Kevin A. McTaggart and published by Dartmouth, N.S. : Defence Research Establishment Atlantic. This book was released on 1993 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Application of the Strip Theory to Nonlinear Motions of Ships in Regular Waves written by Weiguang Bao and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comparison of Force and Motion Predictions Using Strip Theory and a Three Dimensional Method for Hulls at Zero Speed in Waves written by H. T. Wang and published by . This book was released on 1982 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comparison is presented of ship added mass, damping, exciting force, and motion coefficients calculated by Program SMP which uses strip theory and Program MOTIONSO which uses a three-dimensional singularity method. The comparison is made for four ship hulls at zero speed in waves. A summary is given of similarities and differences between the two methods. For the vertical modes of motion: surge, heave, and pitch, the comparison between the two methods generally shows the expected trend of poor agreement at lower frequencies and better agreement at higher frequencies. For the lateral modes of motion: sway, roll, and yaw, the agreement is more dependent upon the shape of the hull and the density and distribution of points used by MOTIONSO to represent the hull. Comparison of calculated and measured motions for one ship hull shows that the agreement is fair. (Author).
