摘要
受管道处海床的冲刷,立管与水平管道连接处常出现管道悬空,严重影响海底管道的安全运行。当管道悬空段较长时,抵抗变形的能力变弱,在管道自身和外部载荷等因素的综合作用下易发生破坏,造成巨大的经济损失和环境污染。在研究中基于土壤的Winkler线性理论,把管道与地基的相互作用用等距离的相同弹簧来代替;考虑轴向力、内压、外流和土壤刚度系数等因素的作用,根据Hamilton原理,建立振动微分方程;利用ANSYS有限元对三维海底悬空管道进行数值模拟和振动特性研究,分析轴向力、内压、外流和土壤刚度等因素对海底悬空管道振动特性的影响,计算出悬空管道的固有频率和临界长度。
Due to seawater erosion,pipeline segments at connection locations between submarine risers and horizontal pipelines will be suspended,which will seriously affect safe operation of these pipelines.The ability to resist deformation will become weak if suspended pipeline segments are long,combined action of such factors as pipeline itself loads and external loads will result in pipeline damage,which will lead to huge economic losses and environmental pollution.In the study,based on Winkler linear theory of soil,same springs with equal spaces are used stead of the interaction between pipeline and foundation,vibration differential equation is established according to Hamilton principle,ANSYS finite element is adopted to numerically simulate three-dimensional submarine suspended pipeline and study its vibration characteristics,analyzed are effects of such factors as axial force,internal pressure,outflow and soil rigidity coefficient on its vibration characteristics and obtained are natural frequency and critical length of submarine suspended pipeline.
出处
《天然气与石油》
2011年第4期9-11,91-92,共3页
Natural Gas and Oil
关键词
海底管道
悬空管道
固有频率
临界长度
有限元
Submarine pipeline
Suspended pipeline
Natural frequency
Critical length
Finite element
