Hydroelasticity theory, considering the second-order fluid forces induced by the coupling of first-order wave potentials, is introduced briefly in this paper. Based on the numerical results of second-order principal coordinates induced by the difference-frequency and sum-frequency fluid forces in multidirectional irregular waves, the bending moments, as well as the vertical displacements of a floating plate used as a numerical example are obtained in an efficient manner. As the phase angle components of the multidirectional waves are random variables, the principal coordinates, the vertical displacements, and the bending moments are all random variables. Extreme values of bending moments are predicted on the basis of the theory of stationary stochastic processes. The predicted linear and nonlinear results of bending moments show that the influences of nonlinear fluid forces are different not only for the different wave phase angles, but also for the different incident wave angles. In the example very large floating structure (VLFS) considered in this paper, the influence of nonlinear fluid force on the predicted extreme bending moment may be as large as 22% of the linear wave exciting forces. For an elastic body with large rigidity, the influence of nonlinear fluid force on the responses may be larger than the first-order exciting forces and should be considered in the hydroelastic analysis.
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November 2010
Structures, Safety and Reliability
Extreme Response of Very Large Floating Structure Considering Second-Order Hydroelastic Effects in Multidirectional Irregular Waves
Xujun Chen,
Xujun Chen
Engineering Institute of Engineering Corps,
e-mail: xjchen@sjtu.edu.cn
PLA University of Science and Technology
, Nanjing 210007, China; Centre for Ships and Ocean Structures, Norwegian University of Science and Technology
, N-7491 Trondheim, Norway
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Torgeir Moan,
Torgeir Moan
Centre for Ships and Ocean Structures,
Norwegian University of Science and Technology
, N-7491 Trondheim, Norway
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Shixiao Fu
Shixiao Fu
Centre for Ships and Ocean Structures,
Norwegian University of Science and Technology
, N-7491, Trondheim, Norway; State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University
, Shanghai 200030, China
Search for other works by this author on:
Xujun Chen
Engineering Institute of Engineering Corps,
PLA University of Science and Technology
, Nanjing 210007, China; Centre for Ships and Ocean Structures, Norwegian University of Science and Technology
, N-7491 Trondheim, Norwaye-mail: xjchen@sjtu.edu.cn
Torgeir Moan
Centre for Ships and Ocean Structures,
Norwegian University of Science and Technology
, N-7491 Trondheim, Norway
Shixiao Fu
Centre for Ships and Ocean Structures,
Norwegian University of Science and Technology
, N-7491, Trondheim, Norway; State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University
, Shanghai 200030, ChinaJ. Offshore Mech. Arct. Eng. Nov 2010, 132(4): 041601 (11 pages)
Published Online: September 23, 2010
Article history
Received:
April 6, 2008
Revised:
February 14, 2009
Online:
September 23, 2010
Published:
September 23, 2010
Citation
Chen, X., Moan, T., and Fu, S. (September 23, 2010). "Extreme Response of Very Large Floating Structure Considering Second-Order Hydroelastic Effects in Multidirectional Irregular Waves." ASME. J. Offshore Mech. Arct. Eng. November 2010; 132(4): 041601. https://doi.org/10.1115/1.4001415
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