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 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 SHIPMO7 an Updated Strip Theory Program for Predicting Ship Motions and Sea Loads in Waves written by Kevin A. McTaggart and published by Dartmouth, N.S. : Defence Research Establishment Atlantic. This book was released on 1997 with total page 118 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 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 Validation of a Strip Theory Based Ship Motion Prediction Program written by Kadir Sariöz and published by . This book was released on 2000 with total page 51 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 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 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).

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 152 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 Improved Boundary Element Methods for Predicting Sectional Hydrodynamic Coefficients for Strip Theory Ship Motion Programs written by Kevin A. McTaggart and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Time domain non linear strip theory for ship motions written by Yun Tao Fan and published by . This book was released on 2004 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comparison of Ship motion Theory and Experiment for Mariner Hull and a Destroyer Hull with Bow Modification written by N. Salvesen and published by . This book was released on 1971 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to evaluate more precisely the accuracy of ship-motion strip theory for ships in head seas. Theoretical and experimental results were compared for the Mariner hull and for a destroyer hull with and without a bow modification. In view of the good agreement found, it was concluded that for practical design purposes, strip theory can be used to predict head-seas motions with satisfactory accuracy provided there is adequate station representation. (Author).

Download or read book Ship Motions and Capsizing in Astern Seas written by and published by . This book was released on 1974 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analytical and experimental study of ship motions and capsizing in extreme seas has been conducted. The analysis of linear and quasi-linear one-dimensional roll models has revealed motion anomalies not apparent from the usual linearized ship motion theory. Extensive tests have been conducted using two radio-controlled models in the wind generated seas of San Francisco Bay. Directional spectra were computed, using a variety of techniques, from the wave measurements by an array of wave gages. Comparisons of the experimentally determined motions and a linear strip theory prediction are presented. A time domain numerical simulation program for motions and capsizing has been used to investigate motions in a variety of wave group configurations. The results show good agreement with observed capsizing phenomena and have revealed a number of important characteristics associated with large geometry changes in waves.