The hydrodynamic damping and added mass coefficients resulted by the use of the heave plates placed at the floating offshore wind turbine (FOWT) platform are discussed and presented via an experimental approach. Different diameters of the heave plates are designed. The objective of this paper is to investigate the contribution to the damping and added mass coefficients for different diameters of the heave plates by using forced oscillations of the FOWT. The effects of Keulegan-Carpenter (KC) number range from 0.18 to 1.11 and frequency of forced oscillation range from 0.40 Hz to 1.43 Hz and heave plate drafts range from 0.34 m to 0.42 m to the hydrodynamic coefficients were also analyzed. Over a variable Dd / Dc(D - the diameter of the heave plates, Dc -the diameter of the column) range from 1.5 to 2.5, calculations indicate that the diameter of the heave plates affect the hydrodynamic coefficients of the FOWT platforms. In addition, the hydrodynamic coefficients of the heave plates are quite different with different KC numbers.
Compared with traditional offshore oil and gas industry(Peng et al., 2021), Floating offshore wind turbines (FOWTs) are considered to be good designs to exploit the tremendous wind energies in deep waters (Cheng et al., 2021; Ren et al., 2022; Wu et al., 2019). Among all the types of FOWTs, semisubmersible FOWTs have attracted more attention due to the low construction cost, competitive mooring system cost, and wide applicability of water depth (Liu et al., 2016; Wang et al., 2022). The semisubmersible FOWTs mainly consist of three columns connected by a set of braces (Zhang et al., 2020; Zhao et al., 2021). Large heave motion responses, will threaten the safety of the mooring systems and affect the efficiency of the power generation (Tao and Dray, 2008). To reduce the heave motions, heave plates are often attached at the bottom of the columns of semisubmersible FOWTs (Kvittem et al., 2012; Roddier et al., 2010).
