海底管线涡激振动响应动力特性

海底管线管跨段的涡激振动，尤其是管跨在涡激振动下的频率锁定现象，是引发海底管线断裂失效的主要因素之一．通过对不同尺寸管道在不同流速条件下的漩涡发放频率、结构自振频率以及振幅的测量实验，找出了圆形管道在稳定流中涡激振动的规律，提出了由约化速度来控制涡激振动的方法为了将模型实验结果与理论计算结果进行比较，建立经验参数与不同实验条件下的物理参数之间的关系，利用尾流振子模型方法计算模型的涡激振动动力响应．通过模型实验说明尾流振子模型方法求解管道涡激振动的可行性，计算结果与实验结果吻合较好．

Dynamic Characteristics of Vortex-Induced Vibration of Submarine Pipeline

The vortex-induced vibration （ VIV ） of span is one of the main factors resulting in failure of submarine pipelines, especially when its frequency is at lock-in. Through testing the vortex frequencies, structural natural frequencies and amplitudes of vibration of different pipeline models at different flow speeds, and the rules of VIV in steady current were obtained. A method for VIV control was found based on reduced velocities. To compare test results with calculation results, the relationship between experimental and physical parameters was built. Dynamic response of VIV was calculated using the wake-oscillator model. The feasibility of solving VIV was illuminated through a model test when the wake-oscillator model was applied. Calculation results were in agreement with experimental results.