图解法预报悬跨管道涡激振动响应

Graphical Solution on Prediction of Vortex Induced Vibration Response for Free Spans Pipeline

利用水动力经验模型,用简易的图解法预报不同功能载荷和边界条件下的深水悬跨管道涡激振动响应频率和振幅。分析内流流速、阻尼和管土耦合作用等因素对涡激振动响应及锁定范围的影响。指出对于低流速内流,特别是有效张力比较大的时候,内流流速对结构固有频率影响很小;管土耦合边界对悬跨振动响应的主要作用在于减小结构固有频率和提高阻尼,有利于减少疲劳累积损伤预报值。

Based on the empirical hydrodynamic coefficients model and graphical solution, the vortex induced vibration （VIV） response frequencies and amplitudes were acquired under different functional loads and boundaries. The research in frequency domain focused on the effect parameters of VIV response and lock in range, such as inner flow velocity, damping and pipe-soil interaction （PSI）. It was found that low inner flow velocity has little effect on eigen-frequency, especially under high axial tension, and the primary effects of PSI on response are that PSI decreases the dominant frequency of the structure＇s vibrations and increases damping, which will be benefited for decreasing the fatigue failure.