Abstract：In order to facilitate the transportation, installation and maintenance of wind turbines, offshore wind farms are mostly in busy waterways, resulting in a significant increase in the probability of offshore wind turbines being collided by ships. In order to enhance the anti-collision ability of offshore wind turbine, reduce the damage degree of collision area and improve its anti-risk performance, this paper proposes a new type of protection device with honeycomb structure characteristics. The explicit dynamic analysis software LS-DYNA was used to simulate the collision process between the 5000t ship and the tripod of the 4MW offshore wind turbine, and the difference between the new honeycomb structure protection device and the traditional solid structure protection device was studied. The results show that the new protective device with honeycomb structure can effectively prolong the contact time and reduce the contact force. Compared with the traditional solid protection device, the internal energy conversion capacity of the new device is increased by more than 15%, and the honeycomb structure plays a role in improving the internal energy conversion capacity. The honeycomb structure protection device has a good energy absorption and buffering effect, which can effectively reduce the internal energy and kinetic energy transferred to the wind turbine structure, reduce the foundation damage, and improve the safety of the offshore wind turbine with tripod.
[1] 毕志远，薛洋，胡金菊，等．新形势下我国海上风电产业发展趋势[J]．中国港口，2022，365(11)：6-8．
Bi Zhiyuan, Xue Yang, Hu Jinju, et al. The development trend of China's offshore wind power industry under the new situation[J]. China Ports, 2022, 365(11): 6-8.
[2] 王恰．中国风电产业40年发展成就与展望[J]．中国能源，2020，42(09)：28-32+9．
Wang Qia. Achievements and prospects of China’s wind power industry development for 40 years[J]. Energy of Energy, 42(09): 28-32+9.
[3] 石又．中国风电、光伏年发电量创历史新高[J]．油气与新能源，2023，35(01)：40．
Shi You. China's annual wind and photovoltaic power generation reached a record high[J]. Petroleum and New Energy, 2023, 35(01): 40.
[4] Caithness windfarm information forum. Wind turbine acctident compilation[EB/OL]. (2010-09)[2023-02]. http://www.caithnesswindfarms.co.uk.html.
[5] Global offshore Wind Health and Safety Organisation. 2020 Incident Data Report[R/OL]. (2021-11)[2022-03]. https://www.gplusoffshorewind.com/work-programme/workstreams/statistics.
[6] Ren Yongli, Meng Qingshen, Chen Chao, et al. Dynamic behavior and damage analysis of a spar-type floating offshore wind turbine under ship collision[J]. Ocean engineering, 2022, 227: 114815.
[7] 莫仁杰．海上风机桩式基础灌浆连接段可靠性研究[D]．大连：大连理工大学，2017．
Mo Renjie. Research on reliability of grouted connection for offshore wind turbine pile foundations[D] Dalian: Dalian university of Technology, 2017.
[8] 刘宇航，李春，周红杰，等．三种海上风力机支撑基础与船舶碰撞的动力响应分析[J]．中国机械工程，2019，30(14)：1646-1652．
Liu Yuhang, Li Chun, Zhou Hongjie, et al. Analysis of dynamic responses of collisions between between three types of offshore wind turbine foundations and ship[J]. China Mechanical Engineering, 2019, 30(14): 1646-1652.
[9] Wang Junjie, Song Yanchen, Wang Wei, et al. Evaluation of flexible floating anti- collision device subjected to ship impact using finite- element method[J]. Ocean engineering, 2019, 178: 321-330.
[10] Lee Kangsu. Effects on the various rubber fender of a tripod offshore wind turbine substructure collision strength due to boat[J]. Ocean Engineering, 2013, 72: 188-194.
[11] 韩志伟，李春，周红杰，等．海上风力机基础防护装置在船舶碰撞下的动态响应研究[J]．机械强度，2020，42(1)：21-28．
Han Zhiwei, Li Chun, Zhou Hongjie, et al. Research on dynamic response with crashworthy devices of offshore wind turbine fundation to ship impact[J]. Journal of mechanical strength, 2020, 42(1): 21-28.
[12] Ren Nianxin, Ou Jinping. A Crashworthy Device Against Ship-OWT Collision and Its Protection Effects on the Tower of Offshore Wind Farms[J]. China Ocean Engineering, 2009, 23(04): 593-602.
[13] Yue Xinzhi, Han Zhiwei, Li Chun, et al. The study on structure design of fender of offshore wind turbine based on fractal feature during collision with ship[J], Ocean Engineering, 2021, 236: 109100.
[14] Yamashita M, Hattori T, Nishimura N, et al. Quasi-static and dynamic axial crushing of various polygonal tubes[J]. Key Engineering Materials, 2007, 340: 1399-1404.
[15] 陈静，邱启艳．蜂窝夹层结构在飞机上的应用及发展[J]．新材料产业，2018(07)：63-67．
Chen Jing, Qiu Qiyan. Application and development of honeycomb sandwich structure in aircraft[J]. Advanced Materials Industry, 2018(07): 63-67.
[16] 韩志伟，李春，周红杰，等．海上风力机与船舶碰撞的动力响应及防碰护装置[J]．中国机械工程，2019，30(12)：1387-1394．
Han Zhiwei, Li Chun, Zhou Hongjie, et al. Dynamic response and anti collision devices of an offshore wind turbine subjected to ship impacts[J]. China Mechanical Engineering, 2019, 30(12): 1387-1394.
[17] 孟利平，程远征，张伦平，等．应变率和应力三轴度对Q345B钢动态力学性能的影响研究[J]．船舶力学，2019，23(10)：1210-1220．
Meng Liping, Cheng Yuanzheng, Zhang Lunping, et al. Influence of strain rate and stress triaxiality on the dynamic mechanical behavior of Q345B steel[J]. Journal of Ship Mechanics, 2019, 23(10): 1210-1220.
[18] 石少卿，康建功，王敏，等．Ansys/Ls-Dyna在爆炸与冲击领域内的工程应用[M]．北京：中国建筑工业出版社，2011．
Shi Shaoqing, Kang Jiangong, Wang Min, et al. ANSYS/LSDYNA in explosion and impact in the field of engineering application[M]. Beijing: China Architecture ＆ Building Press, 2011.
[19] 姜其斌，贾德民，杨军，等．橡胶材料在减震器中的应用[J]．橡胶工业，2004，051(002)：114-119.
Jiang Qibin, Jia Demin, Yang Jun, et al. Application of rubber material in shock absorber[J]. China Rubber Industry, 2004, 051(002): 114-119.
[20] Hallquist J. LS-DYNA keyword manual vol Ⅱ- material models[M]. Livermore: Livermore Software Technology Corporation, 2022.
[21] Wu, Shenrong. A variational principle for dynamic contact with large deformation[J]. Computer Methods in Applied Mechanics and Engineering, 2009, 198(21-26): 2009-2015.
[22] Hallquist J, Goudreau G, Benson D. Sliding interfaces with contact-impact in large-scale Lagrangian computations[J]. Computer Methods in Applied Mechanics and Engineering, 1985, 51: 107-137.
[23] 龚新华，李振坤，杨煜．蜂窝结构复合材料力学行为研究[J]．工程力学，2005，22(2)：126-129．
Gong Xinhua, Li Zhenkun, Yang Yu. Study on mechanical behavior of honeycomb composite materials[J]. Engineering Mechanics, 2005, 22(2): 126-129.
[24] Ma Fangwu, Zhao Ying, Liang Hongyu, et al. Effects of cell micro-to‐pology on the in-plane dynamic crushing analysis of re-entrant square cellular material[J]. Automotive Innovation, 2018, 1: 24-34.
[25] 卢子兴，李康．手性和反手性蜂窝材料的面内冲击性能研究[J]．振动与冲击，2017，36(21)：16-22.
Lu Zixing, Li Kang. In-plane dynamic crushing of chiral and anti-chiral honeycombs[J]. Journal of Vibration and Shock, 2017, 36(21): 16-22.
[26] 黄建．新型零泊松比蜂窝结构力学性能及其变弯度机翼应用研究[D]．哈尔滨：哈尔滨工业大学，2018.
Huang Jian. Mechanical performances of a novel honeycomb design with zero poisson’s ratio and its application in camber morphing wings[D]. Harbin: Harbin Institute of Technology, 2018.
[27] 徐强，张桂彬，陈健云，等．有限元中多边形单元的研究及应用[J]．人民长江，2018，49(12)：77-86.
Xu Qiang, Zhang Guibin, Chen Jianyun, et al. Research and application of polygonal elements in FEM[J]. Yangtze River, 2018, 49(12): 77-86.
[28] Hao Ertong, Liu Chunguang. Evaluation and comparison of anti-impact performance to offshore wind turbine foundations: Monopile, tripod, and jacket[J]. Ocean Engineering, 2017, 130: 218-227.
[29] Design of offshore wind turbine structures[S]. DNV-OS-J101 Offshore Standard, 2011: 26-34.
[30] DNV-RP-C204. Design against accidental laods[S]. Hovik: Det Norske Veritas, 2010.
[31] 赵鑫磊，韩志伟，李春，等．海上风力机设孔防护装置性能研究[J]．中国电机工程学报，2021，41(16)：5624-5634．
Zhao Xinlei, Han Zhiwei, Li Chun, et al. Research on protection performance of Via hole fender for offshore wind turbine[J]. Proceedings of the CSEE, 2021, 41(16): 5624-5634.
[32] Nokob, M.H., & Yeung Ronald W. Added mass of thin flat plates of arbitrary shapes with possible openings[J]. Applied Ocean Research, 2018, 79: 149-159.
[33] 王自力，蒋志勇，顾永宁．船舶碰撞数值仿真的附加质量模型[J]．爆炸与冲击，2002，22(4)：321-326.
Wang Zili, Jiang Zhiyong, Gu Yongning, et al. An added water mass model for numerical simulation of ship/ship collisions[J]. Explosion and shock waves，2002, 22(4): 321-326.
[34] 时党勇，李裕春，张胜民．基于ANSYS/LS-DYNA 8.1进行显式动力分析[M]．北京：清华大学出版社，2005．
Shi Dangyong, Li Yuchun, Zhang Shengmin. Explicit dynamic analysis based on ANSYS/LS-DYNA 8.1[M]. Beijing: Tsinghua University Press, 2005.
[35] Gladman B. LS-DYNA keyword user’s manual[M]. California: Livermore Software Technology Corporation, 2007: 1307-1312.
[36] 岳新智，韩志伟，李春，等．基于分形特征的海上风力机防护装置设计研究[J]．太阳能学报，2023，44(01)：148-155．
Yue Xinzhi, Han Zhiwei, Li Chun, et al. Research on protection device of offshore wind turbine based on fractal characteristics[J]. Acta Energiae Solaris Sinica, 2023, 44(01): 148-155.
