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Measurements Of Pressures On A Heaving Prolate Spheriod
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Book Synopsis Measurements of Pressures on a Heaving Prolate Spheroid by : Choung Mook Lee
Download or read book Measurements of Pressures on a Heaving Prolate Spheroid written by Choung Mook Lee and published by . This book was released on 1966 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The damping and added mass coefficients for a shiplike form oscillating at a free surface are usually approximated by a 'strip calculation' in which two-dimensional values for shapes similar to sections of the body are summed over the length. For the three-dimensional body the real section values differ from the local values used in this procedure because of the three-dimensional nature of the real flow caused by body geometry and forward speed. This report presents experimental results which show the magnitude of the three-dimensional effect for a prolate spheroid undergoing forced heaving oscillations while moving longitudinally in calm water. Local hydrodynamic forces on a spheroid model were measured by a number of flush pressure gauges distributed around the girth of the model at several sections. The sectional added mass and damping were than obtained by resolving the integral of pressure at each section into in phase and quadrature components. Total constraint forces were measured and checked against the longitudinally integrated pressure forces. Results were compared with strip computations using two-dimensional cylinder data. In general, the greatest discrepancies were found at the ends of the model. At amidships, measured values agreed quite clsosely with two-dimensional results. At high frequencies, forward speed was found to have small effect on added mass. However, at high frequencies and high forward speed, negative damping was found at some sections. (Author).
Book Synopsis Measurements of Pressures on a Heaving Prolate Spheriod by : Choung Mook Lee
Download or read book Measurements of Pressures on a Heaving Prolate Spheriod written by Choung Mook Lee and published by . This book was released on 1966 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: The damping and added mass coefficients for a shiplike form oscillating at a free surface are usually approximated by a "strip calculation" in which two-dimensional values for shapes similar to sections of the body are summed over the length. For the three-dimensional body the real section values differ from the local values used in this procedure because of the three-dimensional nature of the real flow caused by body geometry and forward speed. This report presents experimental results which show the magnitude of the three-dimensional effect for a prolate spheriod undergoing forced heaving oscillations while moving longitudunally in calm water. Local hydrodynamic forces on a spheroid model were measured by a number of flush pressure gauges distributed around the girth of the model at several sections. The sectional added mass and damping were then obtained by resolving the integral of pressure at each section into in phase and quadrature components. Total constraint forces were measured and checked against the longitudinally integrated pressure forces.
Author :University of California, Berkeley. Institute of Engineering Research Publisher : ISBN 13 : Total Pages :79 pages Book Rating :4.:/5 (227 download)
Book Synopsis Heaving Forces and Pitching Moments on a Semi-submerged and Restrained Prolate Spheroid Proceeding in Regular Head Waves by : University of California, Berkeley. Institute of Engineering Research
Download or read book Heaving Forces and Pitching Moments on a Semi-submerged and Restrained Prolate Spheroid Proceeding in Regular Head Waves written by University of California, Berkeley. Institute of Engineering Research and published by . This book was released on 1964 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes experiments in which heaving forces and pitching moments were measured on a semi-submerged and restrained prolate spheroid which was towed at a constant speed in regular head waves. By measuring the pressures on the wetted surface of the model and integrating these around each section, longitudinal distributions of vertical force were obtained for different wave lengths and speeds of advance. The total force and moment as obtained by integration of pressure over the wetted surface were compared with direct total force and moment measurements. The present work demonstrates the feasibility of investigating local hydrodynamic forces on small three-dimensional bodies by the use of miniature pressure gages. (Author).
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