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On the impact of arbitrary two-dimensional sections

IP.com Disclosure Number: IPCOM000128034D
Original Publication Date: 1998-Dec-31
Included in the Prior Art Database: 2005-Sep-14
Document File: 5 page(s) / 20K

Publishing Venue

Software Patent Institute

Related People

Mei, Xiaoming: AUTHOR [+3]

Related Documents

http://theses.mit.edu:80/Dienst/UI/2.0/Describe/0018.mit.theses/1998-208: URL

Abstract

When an object drops into the water a slamming load with high pressure on the body happens. Such an impact force often causes serious structure damage to the ships and offshore structures. The study of the water-entry impact problem is thus of fundamental interest and practical significance in naval architecture and marine engineering.

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On The Impact Of Arbitrary Two-Dimensional Sections

by

Xiaoming Mei*
B.S., University 4f Science&Technology Of China (1995) Submitted in partial fulfillment of the requirements for the degree of Master of Science in Ocean Engineering

at the Massachusetts Institute of Technology

June 1998
SIGNATURE OF author: [[signature omitted]]

Department of Ocean Engineering

February 15, 1995
CERTIFIED BY: [[SIGNATURE OMITTED]]

Dick K. P. Yue Professor Of Hydrodynamics And Ocean Engineering Thesis Supervisor ACCEPTED BY: [[SIGNATURE OMITTED]]
J. Kim Vandiver

Chairman, Department Committee on Graduate Students ARCHIVES MASSACHUSETTS INSTITUTE OF TECHNOLOGY LIBRARIES OCT 23 1998

Massachusetts Institute of Technology Page 1 Dec 31, 1998

Page 2 of 5

On the impact of arbitrary two-dimensional sections

On The Impact Of Arbitrary Two-Dimensional Sections

by Xiaoming Mei

Submitted to the Department of Ocean Engineering on February 15, 1998, in partial fulfillment of the requirements for the degree of Master of Science in Ocean Engineering

Abstract

When an object drops into the water a slamming load with high pressure on the body happens. Such an impact force often causes serious structure damage to the ships and offshore structures. The study of the water-entry impact problem is thus of fundamental interest and practical significance in naval architecture and marine engineering.

We analytically study the water-entry problem of an arbitrary two-dimensional object. The linearized formulation of Wagner (1932) for wedges of smell deadrise angles is adopted and extended to general body geometries with the boundary condition on the body satisfied exactly. For wedges and circular cylinders, we derive closed form solutions by using the conformal mapping techniques for the exact solution of the boundary-value problem at any instant. The analytical solutions are confirmed by comparisons to the physical experiments and the fully- nonlinear simulation results for wedges and by comparisons to the existing experiments for circular cylinders. For arbitrary ship-like bodies, we also develop a general solution scheme based on the use of Lewis-form representation of the body geometry. It is applied to wedge and circular cylinder and agrees with the exact solutions very well. For illustration, the solutions for the case of parabolic section and a bow flare section are also presented.

Thesis Supervisor: Dick K. P. Yue Title: Professor Of Hydrodynamics And Ocean Engineering

Acknowledgments

I would like to express my deepest appreciation to Professor Dick K. P. Yue for his guidance and support during this research. During the past years his approach to the engineering science influenced me a lot. The present work coul...