金瑞佳 ,郭 泉,陈松贵 ,柳 叶 ,耿宝磊
AuthorsHTML:金瑞佳 ^1,2，郭 泉 ^2,3，陈松贵 ² ，柳 叶 ^{2, 4}，耿宝磊 ²
AuthorsListE:Jin Ruijia,Guo Quan,Chen Songgu,Liu Ye,Geng Baolei
AuthorsHTMLE:Jin Ruijia^{1, 2}，Guo Quan^{2, 3}，Chen Songguⁱ²，Liu Ye^{2, 4}，Geng Baolei²
Unit:1. 中国海洋大学工程学院，青岛 266100；
2. 交通运输部天津水运工程科学研究院港口水工建筑技术国家工程实验室&工程泥沙 交通行业重点实验室，天津 300456；
3. 河海大学港口海岸与近海工程学院，南京 210098；
4. 天津大学水利工程仿真与安全国家重点实验室，天津 300072

Unit_EngLish:1. College of Engineering，Ocean University of China，Qingdao 266100，China；
2. National Engineering Laboratory for Port Hydraulic Construction Technology & Key Laboratory of Engineering Sediment of Ministry of Communications，Tianjin Research Institute of Water Transport Engineering，Tianjin 300456，China；
3. College of Harbour，Coastal and Offshore Engineering，Hohai University，Nanjing 210098，China；
4. Skate Key Laboratory of Hydraulic Engineering Simulation and Safety，Tianjin University，Tianjin 300072，China

Abstract_Chinese:针对一种新型自由站立式防台风隔水立管系统，在 3 种不同浮筒净浮力条件下，通过几何比尺 1∶21 的大 水槽物理模型试验，研究了纯水流以及波流联合作用下隔水立管整体的涡激振动和运动轨迹情况，统计了不同测点 顺流向位移的平均值和横流向位移的均方根，并对比了纯水流和波流联合工况下立管涡激响应的差异性．研究表 明，浮筒净浮力对新型立管的固有频率和运动响应有较大影响，可以通过调整浮筒净浮力来避免立管自振频率与外 界激励频率锁定，保证结构安全；纯水流工况下新式立管的涡激振动现象明显，同时通过分析立管不同位置的运动 轨迹发现由于结构的复杂性和外部荷载的不稳定性会激发频率为固有频率偶数倍的非对称振动．在波流联合工况 下，波浪在一定程度上抑制了隔水立管的涡激振动，使其整体偏移量减小；在横流向，波流联合工况下新式隔水立 管的涡激振动相比于纯水流工况发生明显变化，波浪频率成为控制其振动响应的主导频率，此时立管位移的最大值 未出现于顶端测点处，而是出现在距离表面波影响较小的测点处．
Abstract_English:The vortex-induced vibration(VIV)of a new type of self-standing riser system against typhoons is studied under three different net buoyancy conditions by a physical model test with a length scale of 1∶21. The VIV and motion trace of riser under the only current and wave-current combined condition is studied；additionally，the average value of the displacements in the in-line direction and the root mean square of the displacements in the cross flow(CF)direction are calculated，and the difference is compared under different conditions. Buoyancy has a significant influence on the natural frequency and motion response of the new riser. The buoyancy of the buoy can be adjusted to avoid the lock-in between the natural frequency of the riser and the external excitation frequency to ensure structural safety. Under the only current condition，the VIV of the new riser is obvious. Simultaneously，analysis ofthe motion traces of different positions of the riser shows that because of the complexity of the structure and the insta\u0002bility of the external load，asymmetric vibrations with an even multiple of natural frequency will be excited. However，under the wave-current combined condition，the wave suppresses the VIV of the riser in a certain degree. Moreover，in the CF direction，the VIV of the new riser under the wave-current coupling condition is significantly different from that under the pure current condition. This time，the wave frequency becomes the dominant frequency to control the vibration response of the riser，and the maximum displacement of the riser appears at the place where the influence of surface wave is small, not at the top measuring point.
Keyword_Chinese:隔水立管；波流联合作用；涡激振动；大比尺波浪水槽
Keywords_English:riser；wave-current combined action；vortex-induced vibration；large-scale wave flume

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