规则波作用下悬跨海缆垂向动力响应试验研究  

Experimental study on vertical dynamic response of submarine cable under regular waves

作　　者：黄惠明[1,2] 黄贤涛 蓝尹余 张俞[1] HUANG Huiming;HUANG Xiantao;LAN Yinyu;ZHANG Yu(College of Port Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China;Key Laboratory of Coastal Disaster and Protection,Ministry of Education,Hohai University,Nanjing 210098,China;Datang Hydropower Science&Technology Research Institute Co.,Ltd,Chengdu 610074,China;Fujian Institute of Oceanography,Xiamen 361013,China;Fujian Key Laboratory of Coast and Island Management Technology,Xiamen 361013,China)

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210098 [2]河海大学海岸灾害及防护教育部重点实验室,江苏南京210098 [3]大唐水电科学技术研究院有限公司,四川成都610074 [4]福建海洋研究所,福建厦门361013 [5]福建省海岛与海岸带管理技术研究重点实验室,福建厦门361013

出　　处：《哈尔滨工程大学学报》2024年第10期1913-1921,1949,共10页Journal of Harbin Engineering University

基　　金：国家重点研发计划(2022YFC3106100);国家自然科学基金项目(51979096);福建省海岛与海岸带管理技术研究重点实验室资助课题(FJCIMTS2022-03);装备预研教育部联合基金项目(8091B022123).

摘　　要：为探究不同规则波要素下悬跨海缆垂向动力响应的变化规律,本文开展了波浪作用下海缆振动模型试验。基于水弹性相似原理制作海缆模型,改变试验波高以及波周期,并引入Morison方程描述海缆所受垂向力。试验结果表明:波浪作用下海缆的振动频率以波浪频率为主,同时伴随着海缆表面弱涡脱落活动产生的波浪多倍频;波高的增大使得海缆周围水质点水平运动速度增大,导致漩涡脱落所引发的升力增大,进而垂向力增大;波周期的减小使得水质点垂向运动速度增加,海缆所受垂向波浪力增强,进而垂向力增大;海缆自振存在约2.8 N的临界垂向力,低于临界垂向力时,海缆未产生自振,大于临界垂向力时,波浪动力作用增强,海缆出现波浪周期的间歇性自振,垂向力增大,应变幅值显著增大。In order to explore the variation law of the vertical dynamic response of the suspended submarine cable under different regular wave elements,the vibration model experiment of the submarine cable under waves was carried out.Based on the principle of hydroelastic similarity,the model of the submarine cable was made,the test wave height and wave period were changed,and the Morrison equation was introduced to describe the vertical force of the submarine cable.The experimental results indicate that the vibration frequency of the submarine cable under wave action is primarily determined by the wave frequency,accompanied by higher harmonics generated by the shedding of weak vortices on the cable surface.An increase in wave height leads to an increase in the horizontal velocity of water particles around the cable,resulting in increased lift force caused by vortex shedding and consequently an increase in vertical force.A decrease in wave period leads to an increase in the vertical velocity of water particles and a stronger vertical wave force acting on the cable,resulting in an increase in vertical force.The submarine cable has a critical vertical force of approximately 2.8 N for its self-resonance.When the vertical force is below this critical value,the cable does not self-resonate.However,when the vertical force exceeds the critical value,the wave-induced dynamic action strengthens,causing intermittent self-resonance of the cable in a wave period and an increase in vertical force,leading to a significant increase in strain amplitude.

关 键 词：海底电缆 规则波 垂向振动 模型试验 动力响应 Morison方程 应变过程 频率分析 

分 类 号：P756.1[天文地球—海洋科学]