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Method for evaluating vortex-induced vibration of deep-sea riser under internal and external flow effect

A technology of vortex-induced vibration and deep-sea riser, which is applied in vibration testing, testing of machine/structural components, measuring devices, etc., and can solve problems such as unreasonable design, little consideration of fluid flow in the tube, and unsafety

Inactive Publication Date: 2019-05-31
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the research on the dynamic design of marine risers focuses more on the outflow effect, and seldom considers the flow effect of the fluid in the pipe. Such a design is unreasonable and unsafe. In the research work of induced vibration, only the lateral single-degree-of-freedom vortex-induced vibration is considered, and the coupling effect of the flow direction and the cross-flow direction in the vortex-induced vibration is ignored, but because the frequency of the vortex-induced vibration in the direction of flow is generally twice the frequency , so the influence of cross-flow and forward-flow coupling effects on the fatigue damage of standpipe vortex-induced vibration can not be ignored

Method used

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  • Method for evaluating vortex-induced vibration of deep-sea riser under internal and external flow effect
  • Method for evaluating vortex-induced vibration of deep-sea riser under internal and external flow effect
  • Method for evaluating vortex-induced vibration of deep-sea riser under internal and external flow effect

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Embodiment Construction

[0053] The present invention is described in further detail below in conjunction with accompanying drawing:

[0054] The deep-sea riser usually has a relatively large slenderness ratio and a small difference in radial deformation, so the shear deformation of the riser can be ignored. The Cartesian coordinate system is selected, the x-axis is the downstream direction, the y-axis is the transverse flow direction, and the z-axis is the vertical direction , the equilibrium relationship of the motion equation of the riser structure is:

[0055] The geometric relationship is:

[0056]

[0057] The stress-strain relationship is:

[0058]

[0059] The equilibrium condition is:

[0060]

[0061] The boundary conditions are:

[0062]

[0063] Among them, κ x and κ y is the curvature of the riser after deformation, M x and M y is the section moment, Q x and Q y is the section shear force, I is the section bending moment of inertia, and the bending differential equati...

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Abstract

The invention discloses a method for evaluating the vortex-induced vibration of a deep-sea riser under an internal and external flow effect. The method includes the steps of firstly, building a Cartesian coordinate system, and considering additional load centrifugal force and Coriolis force generated when oil and gas in working state pass a bent pipeline to build a riser vortex-induced vibration equation comprising a pipeline internal flow speed term and Coriolis force; secondly, considering the riser structure and a fluid linear coupling term to simulate vortex-induced vibration acting forceon the riser; thirdly, using Hermit interpolation function discrete to obtain a matrix equation set; fourthly, using a Newark-beta method to perform step-by-step integration on the matrix equation setto obtain the displacement, speed and acceleration of the riser at the moment t1, and using the displacement, speed and acceleration of the riser at the moment t1 to obtain the displacement, speed and acceleration of the riser at each moment. By the method, the vortex-induced vibration of the deep-sea riser under the internal and external flow effect can be evaluated.

Description

technical field [0001] The invention belongs to the technical field of submarine oil and gas pipeline transportation, and relates to a method for evaluating vortex-induced vibration of a deep-sea riser under the action of internal and external flows. Background technique [0002] With the continuous development of submarine energy development to the deep sea, vortex-induced vibration fatigue has become a major failure mode of deep-sea risers. Once failure occurs, it will cause very serious economic losses and environmental pollution. Therefore, accurate prediction of vortex-induced vibration Vibration plays an important role in the design of the riser. Now, with the unfavorable impact of the fluid inside the pipeline on the actual working pipeline, and the huge economic losses and environmental disasters caused by some projects, the research on the fluid action in the standpipe in vortex induced vibration is particularly urgent and important. [0003] For the dynamic respon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/06
Inventor 骆正山蔡梦倩田珮琦秦樾黄仁惠骆济豪
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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