Citation

Wang SP, Sun SL, Zhang AM, Chen HL. Baozha Yu Chongji 2011; 31(4): 367-372.

Copyright

(Copyright © 2011, Gai Kan Bianjibu)

DOI

unavailable

PMID

unavailable

Abstract

Aimed at the difficulties of underwater explosion load and instantaneous fluid-structure interaction in the numerical simulation of dynamic response of warship structures, based on the Geers-Hunter model, a modified model for calculating the underwater explosion bubble load was proposed by combining with the boundary element method. To overcome the shortcoming of the second-order doubly-asymptotic approximation (DAA2) method in treating the fluid-structure interaction with low frequency and large amplitude motion, a nonlinear double asymptotic approximation (NDAA) method was presented by considering the nonlinear factors such as the violent low-frequency response of the warship and its free surface effect. And a code was developed by combining the presented NDAA method with the finite element code to numerically investigate the dynamic response of warship structures subjected to underwater explosion shockwaves and bubbles. The mean error between numerical and experimental vertical vibration velocities at the different positions is about 16.8%, and it displays that the presented NDAA method is feasible.