The pipe-soil interactions at shoulders can significantly affect the vortex-induced vibrations (VIV) of free-spanning pipes in the subsea. In this paper, the seabed soil reacting force on the pipe is directly calculat...The pipe-soil interactions at shoulders can significantly affect the vortex-induced vibrations (VIV) of free-spanning pipes in the subsea. In this paper, the seabed soil reacting force on the pipe is directly calculated with a nonlinear hysteretic soil model. For the VIV in the middle span, a classic van der Pol wake oscillator is adopted. Based on the Euler-Bernoulli beam theory, the vibration equations of the pipe are obtained which are different in the middle span and at the two end shoulders. The static configuration of the pipe is firstly calculated and then the VIV is simulated.The present model is validated with the comparisons of VIV experiment, pipe-soil interaction experiment and the simulation results of VIV of free-spanning pipes in which the seabed soil is modelled with spring-dashpots. With the present model, the influence of seabed soil on the VIV of a free-spanning pipe is analyzed. The parametric studies show that when the seabed soil has a larger suction area, the pipe vibrates with smaller bending stresses and is safer.While with the increase of the shear strength of the seabed soil, the bending stresses increase and the pipe faces more danger.展开更多
文章提出了海底悬空输流管道纯顺流向涡激振动预报的尾流振子模型,运用两类不同的van der Pol方程描述旋涡尾迹特性。重点分析了悬跨长度,内流因素和轴向力对纯顺流向涡激振动的影响。结果表明:大悬跨长度、小轴向力和高速内流介质可以...文章提出了海底悬空输流管道纯顺流向涡激振动预报的尾流振子模型,运用两类不同的van der Pol方程描述旋涡尾迹特性。重点分析了悬跨长度,内流因素和轴向力对纯顺流向涡激振动的影响。结果表明:大悬跨长度、小轴向力和高速内流介质可以降低纯顺流向涡激振动发生的速度范围,使其更容易发生。展开更多
基金This study was financially supported by the National Natural Science Foundation of China(Grant No.51679167)the Natural Science Foundation of Shandong Province of China(Grant No.ZR2018MEE032)。
文摘The pipe-soil interactions at shoulders can significantly affect the vortex-induced vibrations (VIV) of free-spanning pipes in the subsea. In this paper, the seabed soil reacting force on the pipe is directly calculated with a nonlinear hysteretic soil model. For the VIV in the middle span, a classic van der Pol wake oscillator is adopted. Based on the Euler-Bernoulli beam theory, the vibration equations of the pipe are obtained which are different in the middle span and at the two end shoulders. The static configuration of the pipe is firstly calculated and then the VIV is simulated.The present model is validated with the comparisons of VIV experiment, pipe-soil interaction experiment and the simulation results of VIV of free-spanning pipes in which the seabed soil is modelled with spring-dashpots. With the present model, the influence of seabed soil on the VIV of a free-spanning pipe is analyzed. The parametric studies show that when the seabed soil has a larger suction area, the pipe vibrates with smaller bending stresses and is safer.While with the increase of the shear strength of the seabed soil, the bending stresses increase and the pipe faces more danger.
基金Supported by China Postdoctoral Science Foundation funded project(2013M530116)the National Natural Science Foundation of China(Nos.51209161,51239008 and 51379144)the Major State Basic Research Development Program of China(973 Program)(No.2014CB046803)
文摘文章提出了海底悬空输流管道纯顺流向涡激振动预报的尾流振子模型,运用两类不同的van der Pol方程描述旋涡尾迹特性。重点分析了悬跨长度,内流因素和轴向力对纯顺流向涡激振动的影响。结果表明:大悬跨长度、小轴向力和高速内流介质可以降低纯顺流向涡激振动发生的速度范围,使其更容易发生。
