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RESEARCH PAPERS: Offshore Mechanics

Three-Dimensional Nonlinear Dynamic Analysis Method of Underwater Line Structure and Its Validation

[+] Author and Article Information
H. Suzuki, K. Yoshida

Department of Naval Architecture and Ocean Engineering, University of Tokyo, Tokyo, Japan

J. Offshore Mech. Arct. Eng 114(3), 139-145 (Aug 01, 1992) (7 pages) doi:10.1115/1.2919965 History: Received August 06, 1991; Revised February 21, 1992; Online June 12, 2008

Abstract

A 3-dimensional nonlinear method for analysis of underwater line structures is presented. This analysis method is formulated by the finite element method, and dynamic behavior of the structures is solved in time domain. The motion equations are solved by Newmark time integration scheme. The method can handle all nonlinearities relating to the dynamic motion of the line structures such as hydrodynamic nonlinearity, geometrical nonlinearity, nonlinear boundary condition, and so on. The Newton method is employed to improve stability of the iteration solution when a dynamic equilibrium condition is obtained. The computational method has been verified through comparison with model tests conducted by the authors. These tests required the development of a general-purpose ultrasonic ranging system, which is described briefly. Usually high accuracy is required for the ranging system because of the small size of models used in the basin test, and high frequency is employed. By this system, coordinates of maximum 16 points can be determined at an accuracy of 1 mm.

Copyright © 1992 by The American Society of Mechanical Engineers
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