摘要
海底悬空管道在受到波浪或海流的涡激振动作用时易发生共振,严重时会导致管道失效,为了减少或避免共振的发生,有必要弄清导致海底管道发生共振的各因素相关联系。以海底天然气管道为研究对象,在ANSYS中建立了管道模型;采用ANSYS模态分析方法,对海底天然气管道的固有频率进行了研究,分析了管道跨长、边界条件和管径三个影响因素对天然气管道固有频率的影响。总体来说,管道跨度越短,固有频率越大;管道两端约束条件越少,固有频率也越小;管径越小,固有频率越小。这样可以通过改变或优化管道跨长、约束条件和管道尺寸来减少或避免海底悬跨管道发生共振。
Resonance vibration will happen to suspended submarine pipeline in case of vortex induced vibration resulted from wave or current and violent resonance vibration may lead to pipeline failure.To prevent or decrease occurrence of resonance vibration,it is necessary to understand the relationship between various factors resulting in pipeline resonance vibration.Established is submarine gas pipeline model in ANSYS,analyzed is natural frequency of pipeline by using ANSYS modal analysis method and analyzed are such factors as pipeline diameter,its span length and boundary conditions affecting the natural frequency of pipeline.Analysis results show that pipeline diameter,its span length and boundary conditions have direct effects on the natural frequency of pipeline.Therefore,such measures may be taken as shortening pipeline span length and optimizing its diameter and boundary conditions in order to prevent or decrease occurrence of resonance vibration in suspended submarine gas pipeline.
出处
《天然气与石油》
2011年第6期20-23,6,共4页
Natural Gas and Oil
