中文摘要：

开展剪切流作用下隔水管涡激振动实验,分析剪切流作用下隔水管涡激振动特征参数及振动响应机理。实验中基于光纤光栅传感器测试技术采集剪切流作用下隔水管在流向和横向的涡激振动响应,实验数据处理时消除了实测信号中隔水管轴向预张力的影响并采用模态分析法求取隔水管位移响应。实验数据分析表明,剪切流作用下：隔水管不同位置处同一方向涡激振动响应频率一致;涡激振动锁定现象发生在涡泄频率对应的最大阶次固有频率附近且涡激振动受该阶次固有频率主导;受模态竞争的影响,剪切流涡激振动呈现多频响应形式;隔水管在流向的主导频率是横向主导频率的2倍;受相位角影响,实验中隔水管单个振动周期的运动轨迹呈扁斜“8”字形,多个轨迹重叠后呈“新月”形。图8表1参27

英文摘要：

Vortex-induced vibration of the drilling riser under shear flow was studied by experimental method, and the characteristic parameters of vortex-induced vibration under the shear flow were obtained. The vortex-induced vibration response in both in-line and cross-flow directions were captured by measuring technique based on the fiber Bragg. The influence of the pre-tension during the experiment was eliminated and the experimental data was analyzed by modal analysis method. Results show that, under the shear flow, the dominant frequencies of the drilling riser at different locations are the same, however the shedding frequencies at different locations are different; when the vortex shedding frequency is close to the maximum order of the natural frequency, the lock-in phenomenon occurs, and the dominant frequency equals to this natural frequency; the vortex-induced vibration caused by shear flow is in the form of multi-modal for the influence of modal competition; the in-line direction response frequency is twice the cross-flow direction one; a single vibration period of the riser＇s displacement trajectory appears as an inclined “8” shape, and the multiple vibration period of the riser＇s overlapped displacement trajectory appears as a crescent shape.