Abstract
The hydroelastic response of a very large floating structure in regular waves suffering an external moving point load is considered. The linearized velocity potential theory is adopted to describe the fluid flow. To take into account the coupled effects of the structure deformation and fluid motion, the structure is divided into multiple segments and connected by an elastic beam. Then through adding a stiffness matrix arising from the elastic beam into the multiple bodies coupled motion equations, the hydroelastic response is considered. By applying the Fourier transform to the obtained frequency domain coefficients, the motion equation is transformed into the time domain and the external point load is further considered. The accuracy and effectiveness of the proposed method are verified through the comparison with experimental results. Finally, extensive results are provided, and the effects of the moving point load on the hydroelastic response of the very large floating structure are investigated in detail.
Highlights
Very large floating structure (VLFS) can be used as floating airports and bridges and for many other purposes
The effects of mass and moving velocity of the point loading on the hydroelastic response of the VLFS in waves are investigated in detail
Within the computational range of moving velocity, there is no evidence to show that the vertical displacement or the bending moment increase or decrease with the moving velocity
Summary
Very large floating structure (VLFS) can be used as floating airports and bridges and for many other purposes. Traditional hydroelasticity methods may be categorized into two different approaches, i.e., direct method and modesuperposition method For the former, the equation of motion for a flexible structure is solved directly using conceptually full modes of the discretized system [1,2,3]. Different from the direct and mode-superposition methods, Lu et al [6] proposed a frequency domain discrete-module-beam-bending based hydroelasticity method for a continuous flexible structure in waves. One advantage of this approach is that it avoids the need for predetermination of the flexible modes, which may be difficult for complicated geometric (or connection) features of the flexible structure. The effects of mass and moving velocity of the point loading on the hydroelastic response of the VLFS in waves are investigated in detail
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