Download or read book Efficient Predictions of Wave induced Ship Motions for Ship Defence Models written by Kevin A. McTaggart and published by [Dartmouth, N.S.] : Defence R&D Canada - Atlantic. This book was released on 2004 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book PHM Hullborne Wave induced Motions a Comparison of Predictions with Model Test Measurements written by Canada. Department of National Defence. Research and Development Branch and published by Dartmouth, N.S. : Defence Research Establishment Atlantic. This book was released on 1976 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Statistical Distribution Patterns of Ocean Waves and of Wave Induced Ship Stresses and Motions written by Norman Hans Jasper and published by . This book was released on 1956 with total page 96 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 Numerical Methods for Seakeeping Problems written by Bettar Ould el Moctar and published by Springer. This book was released on 2022-01-20 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 Prediction of Ship Motions in Regular and Irregular Head Waves written by E. N. Hubble and published by . This book was released on 1975 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current techniques for the prediction of ship motions in long-crested head waves are discussed. Addition of a speed term to the theoretical pitch damping coeffieient is correlated with experimental data. The relationship between absolute and relative motion along the ship length is discussed. Practical limits are established for integrating the spectral density functions for irregular-sea responses. Recommendations are made for updating computer program YF17, computing irregular wave responses with either idealized or real sea spectra such as the Station INDIA data.
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 An Investigation of the Utility of Computer Simulation to Predict Ship Structural Response in Waves written by P. Kaplan and published by . This book was released on 1969 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Methods of computer simulation of ship structural response in waves are described, with emphasis given to the slowly varying bending moments due to waves and to slamming responses. Analog, digital, and hybrid computer systems are analyzed, and results obtained by use of the most efficient computational procedures for each type of structural response. The vertical and lateral bending moments due to waves are determined by use of a digital computer, and sample computations illustrated for determining frequency domain outputs. Time history outputs of vertical bending moments due to nonlinear slamming are obtained using a modal model of the ship structural dynamic representations, together with time histories of the wave-induced vertical bending moment due to the same wave system. The capabilities of various computer systems to obtain the required responses, the form of the mathematical model appropriate for computational means, and the time requirements for carrying out the operations are also presented. The rapid assessment of spectral responses and their related statistical properties by means of digital computation, together with time history responses at rates faster than real time, provides a useful tool for determining many aspects of ship structural response characteristics by means of computer simulation. (Author).
Download or read book On the Wave Induced Motions of Ships written by M. Honkanen and published by . This book was released on 1976 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Prediction of Ship Roll Sway and Yaw Motions in Oblique Waves written by Defence Research Establishment Atlantic and published by Dartmouth, N.S. : Defence Research Establishment Atlantic. This book was released on 1977 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical model is developed for the prediction of ship lateral motions in oblique seas. The asymptotic behavior of this model in waves that are long relative to ship beam is examined, with particular emphasis on the classical problem of rolling in beam seas. The theoretical prediction of roll damping is discussed, and the importance of including dynamic lift on appendages is emphasized. Fairly extensive comparisons of predicted and measured roll response are made, with good agreement at all headings considered. (Author).
Download or read book Wave induced Loads and Ship Motions written by Lars Bergdahl and published by . This book was released on 2008 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Correlation of Wave Loads Predicted by the Extended SHIPMO Computer Program with Experiments written by Ando, Samon and published by Dartmouth, N.S. : Defence Research Establishment Atlantic. This book was released on 1985 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wave loads predicted by the extended SHIPMO computer program were compared with experimental data in an attempt to assess the range of validity and to estimate the uncertainty of the predictions. In general, the agreement between theory and experiment was good for the vertical bending moment, but fair to poor for the horizontal bending moment. The predicted torsional moment was found to be in gross disagreement with the measured values in terms of both magnitude and trend. It was not possible to find any correlation of the pattern of the discrepancy between theory and experiment with the principal design characteristics, such as hull form or weight distribution. The present comparison shows that the prediction of ship motions in oblique seas needs to be further improved. Also, systematic model tests covering a wide range of the variables are required to assess the uncertainty of the measurement, and hence, to determine the range of confidence of the predicted loads more clearly. (Author).
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.
Download or read book Validation of WAVELOAD Version 1 0 for the Case of a Destroyer in Regular Head Waves written by and published by . This book was released on 1998 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: The prediction of ship motions, sea loads, & hydrodynamic pressure distribution over a ship hull is an essential component of ship structural design. An important use of such data is to provide accurate hull pressure input for finite-element structural analysis. To this end, the computer program WAVELOAD version 1.0 has been developed to predict ship motions, wave loads, and hydrodynamic pressure in the frequency domain based on the three-dimensional panel method. This report describes the experimental tests with a destroyer model in head seas. Total factor error (TFE) was used as an index of correlation of predicted & measured transfer functions. By examining TFE values, one can assess not only the degree of correlation quantitatively, but also the reliability of the experimental data. The TFE analysis was applied to the predictions by two other computer programs, PRECAL and SHIPMO7, as well as to those by WAVELOAD. The results show whether WAVELOAD is a reliable software package for sea-load predictions.
Download or read book Appendage and Viscous Forces for Ship Motions in Waves written by Kevin A. McTaggart and published by . This book was released on 2004 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the inclusion of appendage & viscous forces in the library of the ShipMo3D ship motion software. Those forces must be considered for accurate prediction of ship motions in sway, roll, & yaw. After an introduction, section 2 describes the axis system used for computing forces on a ship hull and on appendages such as keels, rudders, propellers, and stabilizers. Sections 3 & 4 respectively describe the prediction of forces on ship appendages and hull viscous forces. The inclusion of appendages in hull radiation & diffraction computations is described in section 5. Section 6 covers the modelling of a simple autopilot, which is important for simulating lateral plane motions in waves. Sections 7 & 8 review the numerical implementation of this work and its validation using experimental data for a steered warship model. The final sections include recommendations for future work.
Download or read book Predicting the Motions of SWATH Ships in Waves A Validated Mathematical Model written by and published by . This book was released on 1995 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: A mathematical model for predicting the motions of SWATH ships in waves in the frequency domain is presented. This mathematical model requires definition of only geometric and mass properties. While the mathematical model for the vertical plane presented here differs little from the one which has been used for about a decade, the transverse plane model differs from the previous model in various ways. Predictions are compared to measured model experimental responses to regular waves. These results show that the responses to regular waves are well-predicted for a range of hull forms and conditions.
