Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering ConferenceShanghai, China, June 5–10, 2022
Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE)
ISBN 978-1-880653-81-4; ISSN 1098-6189

www.isope.org

Study On Motion Measurement of Single Floating Anti-heave Device By Two Test Methods
Wei Wang1,2,3, Liqun Xu1, Yonghe Xie3
1.School of Naval Architecture and Maritime, Zhejiang Ocean University, Zhoushan,Zhejiang,China
2.School of Naval Architecture Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai,China
3.Marine Design and Research Institute of China,Shanghai,China.

ABSTRACT2017). However, due to the large restoring force and restoring momentof its main body and part of it comes from catenary mooring, the power
generation efficiency of wind turbine will be reduced and the tower andplatform may overturn (Yu, Liu and Bao, 2012).
The floating wind power platform is subjected to the combined actionof wind, wave and current load at sea. The stability of its platform
structure and good hydrodynamic performance are the fundamental
guarantee for the safe, sustainable and effective operation of floating
wind turbine (Karimirad and Moan, 2012). Heave plate has theadvantages of increasing damping coefficient and added masscoefficient in floating platform, which can effectively increase theresistance of the platform, affect the heave motion of semi-submersible
platform, effectively reduce the amplitude of heave and pitch andenhance the stability of the platform (Karimirad and Moan, 2011).
Tao and Dray (2008) used the forced oscillation test to obtain thehydrodynamic coefficients of solid and porous heave plates throughforce measurement, and analyzed and compared the effects of heave
amplitude, frequency and opening rate on the hydrodynamic
characteristics of heave plates. Molin (2001) studied the hydrodynamic
performance of heave plates with different opening sizes, and studied
the influence of vibration amplitude and opening size on thehydrodynamic performance of heave plates in forced oscillation motion.
The effects of opening size, KC number and oscillation frequency onhydrodynamic coefficient are studied.
Chamfering the anti-heave plate can further increase the resistance of
the anti-heave plate and inhibit the movement of the floating wind
power platform. The analysis and research on its hydrodynamicperformance, especially the heave movement, can not only ensure thesafety and stability of the floating platform structure, avoid damage tothe wind power platform due to excessive heave, but also an important
way to improve the power generation efficiency of offshore generator
units.
Therefore, taking a single pontoon in deep Cwind wind power platform
as the research object, referring to the previous experimental results,
under the condition of selecting an opening size and opening rate withobvious anti surge effect, the anti-heave performance of heave platewith 35 ° opening chamfer is studied and analyzed. Through the data of
two different experimental measurement methods, the heave of thesingle pontoon anti surge device with the two measurement methods
under different wave periods and wave heights is compared, andWhen the offshore wind power platform operates in bad sea conditions,in order to ensure its safety, the anti-heave device can slow down its
oscillation effect under the action of waves and improve its
environmental adaptability. Therefore, the measurement of this effect isparticularly critical. Taking the single pontoon in the deep Cwind
power platform as the model, selects a special anti-heave device, firstcarries out the preliminary numerical simulation, and then the model
test is carried out by two measurement methods: acceleration sensor
and displacement sensor, and the motion observation of pontoon
motion is studied.

KEY WORDS: deep Cwind power platform; anti-heave device;single pontoon; model test; two measurement methods; motion
observation.

INTRODUCTION
At present, the research on floating wind turbine platform carried out
by scholars all over the world is basically based on four conceptualmodels: ITI Energy Barge, MIT/NRELTLP, OC3-Hywind Spar Buoy
and OC4-deep Cwind, which are essentially barge type, tension legtype, single column type and semi-submersible type (Jonkman andMatha, 2009).
Among them, although the TLP and Spar platform have goodhydrodynamic performance, the TLP is prone to resonance and elastic
vibration, and the tension tendon is prone to head shaking, and therelative cost is high; Spar platform is easy to induce vortex excitationand large heave movement, and the main body is large, which isdifficult to install and construct; compared with other types ofplatforms, semi-submersible platform has the advantages of flexible
water depth setting, convenient assembly and maintenance (Li, Ye andGao,2013).
The main body of the semi-submersible platform is located near thefree sea surface. The position and stability of the platform are
maintained through the balance of gravity, buoyancy and catenary
tension. Restraining the sway motion of floating wind turbine platform
in complex marine environment is of great significance to ensure thesafe and stable operation of floating wind turbine (Huang, Li and Ding,2109