A method to estimate the hydroelastic behaviour of VLFS based on multi-rigid-body dynamics and beam bending

ABSTRACT This paper introduces a new method which is based on multi-body hydrodynamics and Euler–Bernoulli beam assumption to study hydroelastic behaviours of very large floating structures (VLFSs). A continuous VLFS is divided into several modules, being multi-module floating structures. The section between two adjacent modules’ centre is seen as a beam element. Based on the above assumption, the six-degree-of-freedom motion of a module's centre is both affected by the hydrodynamic interaction with its adjacent module and restricted by the deformation condition of the equivalent beam between two modules. Then the motion equation of the equivalent multi-module floating structures can be established utilising the potential flow theory and Euler–Bernoulli beam hypothesis. The results calculated by the present method are compared with experimental results and numerically calculated data by three-dimensional hydroelastic theory, which shows rather good agreement.

[1]  Goo,et al.  A numerical method for huge semisubmersible responses in waves , 1990 .

[2]  Arthur W. Lees,et al.  A conforming unified finite element formulation for the vibration of thick beams and frames , 2005, International Journal for Numerical Methods in Engineering.

[3]  S. R. Heller,et al.  HYDROELASTICITY: A NEW NAVAL SCIENCE , 2009 .

[4]  Pandeli Temarel,et al.  Antisymmetric behaviour of pontoon and semi-submersible types of very large floating structure in regular oblique waves , 2004 .

[5]  H. R. Riggs,et al.  The hydrostatic stiffness of flexible floating structures for linear hydroelasticity , 2000 .

[6]  Prasanta K. Sahoo,et al.  Numerical study of hydrodynamic response of mooring lines for large floating structure in South China Sea , 2016 .

[7]  W. Cui,et al.  Hydroelastic analysis of flexible floating interconnected structures , 2007 .

[8]  W. G. Price,et al.  GENERALISED ANTISYMMETRIC FLUID FORCES APPLIED TO A SHIP IN A SEAWAY , 1977 .

[9]  Bing Wang,et al.  Influence of the legs underwater on the hydrodynamic response of the multi-leg floating structure , 2014 .

[10]  Shigeki Sakai,et al.  TIME DOMAIN ANALYSIS ON THE DYNAMIC RESPONSE OF A FLEXIBLE FLOATING STRUCTURE TO WAVES , 2002 .

[11]  Cui Wei-cheng.  Current Status and Future Directions in Predicting the Hydroelastic Response of Very Large Floating Structures , 2002 .

[12]  Hisayoshi Endo,et al.  On the Hydroelastic Response of Box-Shaped Floating Structure with Shallow Draft , 1996 .

[13]  W. G. Price,et al.  THE SYMMETRIC GENERALISED FLUID FORCES APPLIED TO A SHIP IN A SEAWAY , 1977 .