IMPROVED TIME-DOMAINE CODE FOR PREDICTION OF SHIP MOTION AND SEA LOADS IN HEAD AND FOLLOWING SEAS

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Authors
  1. Johnston, G.W.
  2. Yamane, D.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Aerospace Engineering and Research Consultants Ltd, Downsview ONT (CAN)
Abstract
The prediction methods and associated computer code developed earlier for the solution of the linear time domain hydrodynamic ship motion problem and restricted to head sea conditions has been extended to include following sea conditions. Both the incident Froude Krylov and diffracted waves forces are seaparately evaluated evaluated for following sea conditions using established linear time domain methods. Calculations are carried out in a ship-fixed, uniformly translating coordinate system, in order to exploit the well-known theoretical methods available for the analysis of time invariant linear systems. The system characterizing impusle response functions are determined using Fourier transform methods, with non-impulsive input functions. In the moving frame formulation the frequency content of the input functions used must be restricted, so that three separate impulse response functions must be calculated to define each of the incident and diffracted wave forces. After completing the necessary theoretical and computational extensions, a limited validation study was carried out to examine the performance of the improved hull motion prediction procedures. Both experimentally measured and numerically predicted hull motion data for three widely differing hull forms were compared to numerical predictions obtained from the present computational modelling. Both head sea and following sea data have been included in this study. TRUNCATED
Keywords
Following seas;Sea loads;Head seas
Report Number
DREA-CR-95-481 — Contractor Report (Final)
Date of publication
01 Oct 1995
Number of Pages
156
DSTKIM No
96-01460
CANDIS No
180661
Format(s):
Document Image stored on Optical Disk;Hardcopy

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