Open AccessCondensation method in practical modal analysis of hull vibration with application of 3D FE model
Author(s) -
I Valeriy Sutyrin
Publication year - 2019
Publication title -
trudy krylovskogo gosudarstvennogo naučnogo centra
Language(s) - English
Resource type - Journals
eISSN - 2618-8244
pISSN - 2542-2324
DOI - 10.24937/2542-2324-2019-1-s-i-162-169
Subject(s) - hull , modal , vibration , modal analysis , finite element method , structuring , structural engineering , reduction (mathematics) , modal testing , boundary value problem , acoustics , computer science , engineering , mathematics , geometry , materials science , physics , marine engineering , mathematical analysis , finance , polymer chemistry , economics
This paper gives modal analysis results for mid-body of a refrigerator carrier ship by means of combined three-dimensional finite-element model with 1.5 million DOF. The study estimates the error of modal analysis for the ship structure if its boundaryconditions are specified in advance, i.e. approximately, as well as analyses the gain in time offered by structuring the analytical model as per reduction (condensation) method.Analytical approaches thus transformed can be successfully applied in filtering lower frequencies and modes of natural vibrations for structural elements and joints of hull in the direct vicinity of exciting force application points.