PROPOSED METHOD FOR CALCULATION OF SPECTRAL RESPONSE TO RANDOM WAVE LOADING USING TOP-DOWN FINITE ELEMENT MODELLING

PDF

Authors
  1. Stredulinsky, D.C.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Ship structural design and analysis is moving away from empirical static design wave balance and towards more rational methods involving computer modelling of the sea load and structural response. A ship load history is usually only known or predicted in terms of an operational profile defined by the time spent in many combinations of different ship speeds, headings and sea environments. Each combination of speed, heading and the wave frequency spectrum defining the sea environment can be used to derive a frequency spectrum of the local structural response (such as stress, strain or stress intensity factor) at a location or region of the ship. The resulting response spectra can then be applied in a fatigue or ultimate strength assessment. The report proposes a method for the calculation of the frequency spectrum of the structural response based on the use of regular wave hull pressure loads and rigid body accelerations provided by PRECAL (a linear frequency domain hydrodynamics code based on 3D potential flow) and a top-down quasi-static structural analysis procedure to be implemented in the DND suite of finite element codes called VAST. Static finite element analyses are conducted for unit hydrodynamic facet pressure and rigid body acceleration load cases. TRUNCATED
Keywords
Ocean wave spectra;Random response;Hull pressure;Computer programs (PRECAL);Structural response
Report Number
DREA-TM-97-209 — Technical Memorandum
Date of publication
01 Nov 1996
Number of Pages
32
DSTKIM No
97-03792
CANDIS No
503810
Format(s):
Hardcopy;Document Image stored on Optical Disk

Permanent link

Document 1 of 1

Date modified: