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中文摘要：
基于挪威海洋技术研究所（MARINTEK）和挪威科技大学（NTNU）共同研发的VIVANA模型,编制了一个基于频率响应法的海底悬跨管道涡激振动预报程序,其计算结果与VIVANA符合得较好。应用所编制的程序分析在不同流速条件下海底悬跨管道的涡激振动响应及响应频率的特征,对不同悬跨长度、不同截面特征、具有简单边界的海底悬跨管道涡激振动响应和响应频率进行了计算,给出位移和应力沿管跨的分布及响应频率的变化规律。
英文摘要：
Vortex induced vibrations （VIV） contribute significantly to fatigue damage for free spanning pipehnes. This paper discusses various models for VIV of free spanning pipelines, and develops a frequency computer program for the calculation of VIV of free spanning pipelines. The code uses the frequency response method, based on VIVANA model developed by MARINTEK and NTNU in Norway. It is shown that the computation results are good with the results from VIVANA. The dynamic response of VIV of free span pipelines with hinged supports at two ends are calculated for different free span lengths and different section configurations. The displacement and stress distributions along the free spanning pipelines are given and the properties of vortex induced vibrations at different current speeds are discussed.
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