TY - JOUR ID - 149344 TI - Application of tuned liquid column damper for motion reduction of semisubmersible platforms JO - International Journal Of Coastal, Offshore And Environmental Engineering(ijcoe) JA - IJCOE LA - en SN - AU - Feizian, Hamid Reza AU - Shafieefar, Mehdi AU - Panahi, Roozbeh AD - Tarbiat Modares University Y1 - 2020 PY - 2020 VL - 5 IS - 2 SP - 23 EP - 40 KW - Tuned liquid column damper KW - Semisubmersible platform KW - Low-frequency motion KW - Irregular waves DO - 10.22034/ijcoe.2020.149344 N2 - 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.  UR - https://www.ijcoe.org/article_149344.html L1 - https://www.ijcoe.org/article_149344_41c5bfd8e0b5bde8c6287029a02d7d24.pdf ER -