Time-Domain Analysis of Ship Motions and Hydrodynamic Pressures on a Ship Hull in Waves

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Authors
  1. Cong, L.Z.
  2. Huang, Z.J.
  3. Ando, S.
  4. Hsiung, C.C.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
This paper describes the development of a three-dimensional time-domain numerical model for calculating hull pressures as well as hydroelastic analysis of a ship hull in waves. In this work, hydrodynamic forces and pressures due to the radiated and diffracted waves are expressed as convolution products of a response function with either the velocity of ship motion or the wave elevation. The present method significantly reduces the need for numerical evaluation of the time-domain Green function in the convolution of memory effects. The response functions of forces and pressures of radiated and diffracted waves are obtained by numerically solving the Fredholm integral equation of the first kind. The present method based on the Fourier transformation, since the latter is fraught with numerical difficulties. In the equations of motion, maneuvering and rudder forces as well as the radiation and diffraction forces, nonlinear restoring and Froude-Krylov forces are taken into account.
Keywords
Time domain;Froude-Krylov;Frequency domain;Hull pressure;Sea loads
Report Number
DREA-P-1998-ANDO-1 — Paper
Date of publication
01 Dec 1998
Number of Pages
14
DSTKIM No
CA001294
CANDIS No
513124
Format(s):
Hardcopy;Document Image stored on Optical Disk

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