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Volume 19, Issue 38 (4-2023)                   Marine Engineering 2023, 19(38): 62-76 | Back to browse issues page

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Emami A, Mostafa Gharabaghi A R. Improvement of the heave motion of a semi-submersible platform with damping sheets subjected to sea waves. Marine Engineering 2023; 19 (38) :62-76
URL: http://marine-eng.ir/article-1-1007-en.html
Improvement of the heave motion of a semi-submersible platform with damping sheets subjected to sea waves
Aerfeh Emami * 1, Ahmad Reza Mostafa Gharabaghi2
1- Assistant Professor, Hormozgan University
2- Professor, Sahand University of Technology
Abstract:   (991 Views)
In this study, the damping sheets were attached to a semi-submersible platform to mitigate the heave motions. We first examined a typical GVA4000 semi-sub under a monochromatic linear wave train in deep water. an analytical method based on diffraction theory was used to determine the heave motion response. The results revealed that the analytical results show good agreement with available experimental data. Then, the damping sheets were attached to the pontoons of the GVA4000 semi-sub under study. The heave motion response was evaluated with the changing numbers and widths of sheets under constant thickness in different sea waves conditions. The results showed that with increasing damping sheet width, the heave motion response is improved. Moreover, the heave natural frequency of semi-sub is shifted far away from the monochromatic wave frequency, so, the resonant phenomenon significantly decreases. Based on the proposed method, it is concluded that the solution to reducing heave motion response of the semi-submersible platform is simple, effective, economical and practicable.
Keywords: Heave motion, Semi-submersible platform, Analytical solution, Damping sheets, Eigenfunction Expansion Method, Diffraction theory
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Type of Study: Research Paper | Subject: Offshore Structure
Received: 2022/10/19 | Accepted: 2023/02/24
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International Journal of Maritime Technology is licensed under a

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