International Journal Of Coastal, Offshore And Environmental Engineering(ijcoe)

International Journal Of Coastal, Offshore And Environmental Engineering(ijcoe)

Application of tuned liquid column damper for motion reduction of semisubmersible platforms

Authors
Hamid Reza Feizian
Mehdi Shafieefar
Roozbeh Panahi
Tarbiat Modares University
10.22034/ijcoe.2020.149344
Abstract
Incorporation of a tuned liquid column damper (TLCD) into a semisubmersible drilling platform is numerically investigated in this paper. First, a governing equation for liquid fluctuation in the TLCD is derived for the planar motion of the TLCD in conjunction with the motion of the platform. Then, the real-time response of the platform under irregular waves is analyzed using radiation/diffraction theory in which TLCD loading is exerted on the platform at each time-step. This facilitates capture of the difference-frequency and sum frequency second order wave forces and the low-frequency motion of the platform. The results show that the effect of the rotational motion of the platform on the TLCD is significant and the TLCD has a reciprocal effect on this rotational motion of the platform. It is shown that the TLCD decreases the low-frequency motion of the platform and has no considerable effect on the wave-frequency motion. Also, the sensitivity of the platform motion to the main specifications of the TLCD is assessed by a parametric study. 
Keywords
Tuned liquid column damper
Semisubmersible platform
Low-frequency motion
Irregular waves
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