Research on the Structural Strength of Floating Offshore Wind Turbine Platform Based on Long and Short Term Design Waves

doi:10.12141/j.issn.1000-565X.240165

Abstract

Abstract:

Stability and safety of floating wind turbine platforms in deep and distant sea environments are the core issues of floating offshore wind turbine systems. This paper analyzed the effects of multiple load control parameters on the design wave parameters under extreme wave loads by numerical simulation based on two design wave methods of long and short-term, and evaluated the structural strength of the floating offshore wind turbine platform using different design wave methods. The results show that: the traditional load control parameters of mid-longitudinal profile, mid-transverse profile and waterline plane cannot accurately capture the most dangerous loading conditions suffered by the floating offshore wind turbine platform, and the structural strength analysis of the floating offshore wind turbine platform also needs to take into account the stress concentration phenomenon at different structural connection locations, and thus needs to consider the influence of more load control parameters on the structural strength; the long term statistical design wave method can reflect the complexity of the marine environment more comprehensively, and can obtain the structural strength of the floating offshore wind turbine platform using different design wave methods. The long-term statistical design wave method can more comprehensively reflect the complexity of the marine environment and obtain the design wave parameters of the floating offshore wind turbine platform in the most dangerous state, while the short-term design wave method has the advantage of quickly assessing the structural strength of extreme wave conditions. The two can be used in conjunction with each other in accordance with the different design stages of the floating offshore wind turbine platform. The search for the most dangerous working conditions through the design wave method can not be compared with only the height of the wave parameters in the design.Calculation results show that the maximum stress obtained from two different design wave methods does not necessarily correspond to the highest wave height. This indicates that the wave height alone cannot determine the most critical condition. A comprehensive analysis of factors such as wave height, wave period, wave direction, and phase is required to assess their impact on structural strength. These findings are of significant importance for the structural design and safety evaluation of floating wind turbine platforms.

Key words: floating offshore wind turbine, structural strength, long-term design wave, short-term design wave

CLC Number:

U663.2

LI Ping, WANG Hongbo, CHEN Chaohe. Research on the Structural Strength of Floating Offshore Wind Turbine Platform Based on Long and Short Term Design Waves[J]. Journal of South China University of Technology(Natural Science Edition), 2025, 53(2): 92-106.

Figures/Tables 27

Fig.1

Table 1

Fig.2

Fig.3

Fig.4

Fig.5

Table 2

Table 3

Table 4

Fig.6

Fig.7

Table 5

Table 6

Fig.8

Fig.9

Table 7

Table 8

Table 9

Fig.10

Table 10

Fig.11

Table 11

Fig.12

Table 12

Fig.13

Fig.14

Fig.15

References 27

1	RAVINTHRAKUMAR S， LEIRA B J， HAVER S， et al. Evaluation of extreme design wave loads for hull girder strength assessment［J］．Trends in the Analysis and Design of Marine Structures，2019，2（1）：23-30.
2	SOHN J M， CHEON H， HONG K，et al ．Equivalent design wave approach for structural analysis of floating pendulum wave energy converter［J］．Ships and Offshore Structures，2016，11（6）：645-654.
3	LI H， REN H， WEI T， et al ．Study on the Wave Loads and Strength Assessment Method on Semi-Submersible Platform［C］∥Proceedings of the 28th International Conference on Offshore Mechanics and Arctic Engineering．Honolulu：OMAE，2009：463-471.
4	Column-Stabilized unit：DNVGL-RP-C103—2015 ［S］．
5	DONG Y， ZHANG J， ZHONG S，et al ．Simplified strength assessment for preliminary structural design of floating offshore wind turbine semi-submersible platform［J］．Journal of Marine Science and Engineering，2024，12（2）：259-276.
6	孙寅博，窦培林．Truss Spar 结构浮式风机基础总体强度分析［J］．舰船科学技术，2021，43（4）：107-110.
	SUN Yinbo， DOU Peilin ．Overall strength analysis of truss spar floating wind turbine foundation［J］．Ship Science and Technology，2021，43（4）：107-110.
7	YANG Y， CHEN C， ZHAO W，et al ．An innovative method of assessing yield strength of floater hull for semi-submersible floating wind turbine in whole life period［J］．Ocean Engineering，2023，270：113679/1-16.
8	LIN J， WU W， PENG Z ．Overall strength analysis of floating offshore wind turbine foundation［J］．Journal of Physics：Conference Series，2023，2419（1）：012017/1-10.
9	唐友刚，王涵，陶海成，等．海上风机半潜型浮式基础结构设计及整体强度分析［J］．中国造船，2013，54（3）：85-93.
	TANG Yougang， WANG Han， TAO Haicheng，et al ．Structure design and global strength analysis for semi-submersible floating foundation of offshore wind turbine［J］．Shipbuilding of China，2013，54（3）：85-93
10	桑松，于梅，石晓，等．基于设计波法的半潜型浮式风力机结构强度校核［J］．太阳能学报，2019，40（1）：185-191.
	SANG Song， YU Mei， SHI Xiao，et al ．Strength check on deep sea semi-submersible floating wind turbine based on design wave method［J］．Acta Energiae Solaris Sinica，2019，40（1）：185-191.
11	聂焱．浮式风机基础结构强度设计［J］．水电与新能源，2019，33（4）：74-78.
	NIE Yan ．Structural strength design of the floating wind turbine Foundation［J］．Hydropower and New Engegy，2019，33（4）：74-78.
12	宋兆波．大型浮式海上风机平台结构设计和动力特性研究［D］．大连：大连理工大学，2022.
13	范文华，滕斌，丛培文，等．准陷波现象对多柱平台特征内力影响的研究［J］．中国海洋平台，2016，31（2）：68-74.
	FAN Wenhua， TENG Bin， CONG Peiwen，et al ．Near-trapping effect on characteristic internal forces of the multi-cylinder platform［J］．China Offshore Platform，2016，31（2）：68-74.
14	方钟圣．西北太平洋波浪统计集［M］．北京：国防工业出版社，1996.
15	张朝阳．深水半潜平台总体强度分析中波浪载荷计算与简化建模方法研究［D］．上海：上海交通大学，2012.
16	中国船级社．海上浮动设施入级规范［R］．北京：人民交通出版社，2023.
17	廖海翔．基于SVR的非结构网格变形技术研究［D］．长沙：国防科技大学，2020.
18	SILVA De SO E， BERTHELSEN P A， ELIASSEN L，et al ．Definition of the INO Windmoor 12 MW base case floating wind turbine［J］．Sintef Ocean，2021，11（1）：1-82.
19	BOGE S N， EKERHOVD D W ．A hydro-aerodynamic analysis of a floating offshore wind turbine to assist in floater selection［D］．Trondheim：NTNU，2022.
20	李红涛，邓贤锋．半潜式平台整体结构设计的波浪载荷研究［J］．中国海上油气，2015，27（2）：98-103.
	LI Hongtao， DENG Xianfeng ．Study on wave loads for global structural design of semi-submersibles［J］．China Offshore Oil and Gas，2015，27（2）： 98-103.
21	梁双令，齐江辉，章红雨，等．基于设计波法的海洋核动力平台波浪载荷计算［J］．舰船科学技术，2019，41（7）：90-94.
	LIANG Shuangling， QI Jianghui， ZHANG Hongyu，et al ．Wave loads calculation of marine nuclear power platform based on design wave methods［J］．Ship Science and Technology，2019，41（7）：90-94.
22	吉华宇．深水半潜平台总体强度设计波分析方法研究［D］．上海：上海交通大学，2019.
23	Structural design of offshore units- method：DNVGL-OS-C201—2017［S］．
24	Wind turbines-Part 3-1，design requirements for fixed offshore wind turbines：［S］．
25	Part 3-2：design requirements for floating offshore wind turbines：［S］．
26	中国船级社．海上浮式风机平台指南［R］．北京：人民交通出版社，2021.
27	中国船级社．海上浮式装置入级规范［R］．北京：人民交通出版社，2020.

有义波高/m	概率
有义波高/m	3.5^1）	4^1）	5^1）	6^1）	7^1）	8^1）	9^1）	10^1）	11^1）
0~0.50	0.001	0.010	0.029	0.029	0.015	0.005	0.001	—	—
0.50~0.85	—	0.008	0.031	0.037	0.021	0.008	0.002	—	—
0.85~1.25	—	0.007	0.034	0.050	0.033	0.013	0.004	0.001	—
1.25~1.85	—	0.005	0.037	0.072	0.057	0.025	0.008	0.002	—
1.85~2.50	—	0.001	0.019	0.055	0.057	0.03	0.010	0.002	—
2.50~3.25	—	—	0.007	0.032	0.046	0.031	0.012	0.003	0.001
3.25~4.00	—	—	0.001	0.011	0.024	0.022	0.010	0.003	0.001
4.00~5.00	—	—	—	0.002	0.012	0.017	0.010	0.003	0.001
5.00~6.00	—	—	—	—	0.002	0.006	0.006	0.002	0.001
6.00~7.50	—	—	—	—	—	0.002	0.003	0.002	0.001
7.50~9.00	—	—	—	—	—	—	0.001	0.001	—

浮式风机平台参数	数值
立柱直径/m	15.0
立柱高度/m	31.0
下浮箱宽/m	10.0
下浮箱高/m	4.0
立柱中心距离/m	61.0
横撑宽/m	3.5
横撑高/m	3.5
排水量/t	14 176.1

风机参数	数值
额定功率/MW	12.0
风机转子直径/m	216.9
轮毂直径/m	5.0
叶片长度/m	105.4
轮毂高度/m	131.7
切入、额定、切出风速/（m·s^-1）	4.0、10.6、25.0
单个叶片质量/kg	63 024
轮毂质量/kg	60 000
机舱质量/kg	600 000

位置	线位移约束			角位移约束
位置	δ_x	δ_y	δ_z	θ_x	θ_y	θ_z
s_p1	—	—	固定	—	—	—
s_p2	固定	固定	固定	—	—	—
s_p3	固定	—	固定	—	—	—

参数	数值
波浪谱	Pierson-Moscowitz（PM）谱^［4］
波浪散布图	中国南海S₄海域^［14］
设计水深/m	300
浪向/（°）	0°~360°，间隔为30°
波浪周期/s	3、4、5、6、7、8、9、10、11、12、13、14、15、16、17、18、19、20、21、22、23、24、26、28、30