Abstract
With increasing demands for huge ship dimensions and the wide use of high-strength steel, the influence of slamming and elastic structure on structural strength cannot be ignored. Therefore, in this paper, a three-dimensional (3D) nonlinear hydroelastic theory is introduced, in which the nonlinear hydrostatic restoring force caused by instantaneous wetted surface as well as slamming force are taken into consideration, and the bending moments with/without slamming effects are calculated, respectively. Numerical simulations of the dynamic response of a flexible hull at different speeds are carried out using the finite element analysis software MSC/PATRAN. By comparison with the results of classical beam theory, the accuracy of the dynamic analysis method is studied. Finally, the dynamic response method is compared with the quasi-static method and classical beam theory. By analyzing and quantifying the influence of forward speed and nonlinear factors on structural responses, the reasonable applicable conditions for different methods are discussed, which can be used as reference in the structure design of bulk carriers.
Highlights
In order to take more factors into calculation to meet the requirement of practical engineering, some nonlinear terms, such as nonlinear restoring force and nonlinear wave exciting force caused by instantaneous wetted surface as well as slamming force are added to the motion
Before the contrast analysis dynamic response, loads of the section in time domain need to be predicted based on the nonlinear hydroelastic method, cross-section in time domain need to be predicted based on the nonlinear hydroelastic cross-section in time domain need to be predicted based on the nonlinear hydroelastic and thenand the time-domain bending stresses be obtained the classical theory
The wave loads of a bulk carrier are obtained by 3D nonlinear hydroelastic method
Summary
With the rapid development of the maritime transport industry and the speed of the construction of merchant ships, large-scale ships are becoming more and more popular. The load responses induced by waves have a very important impact on the structure safety assessment of hulls. Lavroff et al [7] studied the peak wave slamming loads based on a hydroelastic segmented model experiment of the 112 m INCAT. Lin et al [11] presented an approximate method of symmetric and asymmetric flare slamming analysis based on global ship response in the time domain. Some scholars have studied the wave loads and slamming problem of trimarans by means of model experiments [13,14]. The main objective of this study is efficient and accurate estimation of dynamic responses of a flexible hull For this purpose, a time-domain nonlinear hydroelastic method is developed. By analyzing and quantifying the influence of forward speed and nonlinear factors on structural responses, the reasonable applicable conditions for different methods are discussed
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