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A method for calculating the natural frequency of natural vibration of marine pipelines

A technology of natural frequency and calculation method, applied in the field of marine engineering, can solve the problems of not considering the influence of the initial curvature of the pipeline, and the coupling effect of the pipeline and the incoming flow, etc., to achieve the effect of simplifying the calculation process

Active Publication Date: 2022-08-09
JINAN UNIVERSITY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Although scholars at home and abroad have studied the vibration of marine pipelines, they generally do not consider the influence of the initial curvature of the pipeline, or even the coupling effect between the pipeline and the incoming flow.
This simplifies the difficulty of the problem to a certain extent, but has a certain error

Method used

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  • A method for calculating the natural frequency of natural vibration of marine pipelines
  • A method for calculating the natural frequency of natural vibration of marine pipelines
  • A method for calculating the natural frequency of natural vibration of marine pipelines

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Embodiment

[0046] S1, such as figure 1 As shown, this embodiment discloses a method for calculating the natural frequency of the free vibration of an ocean pipeline based on the plate-shell theory and considering the effect of fluid-structure interaction and the initial curvature of the pipeline. First, measure the geometric parameters of the marine pipeline and determine the material parameters of the marine pipeline, including: the radius R of the marine pipeline, the length L of the pipeline, the wall thickness h of the pipeline, the elastic modulus E, the Poisson's ratio μ; the density ρ of seawater f .

[0047] S2. Calculate the bending stiffness D of the marine pipeline, and the second kind of virtual quantity Bessel function K n (k m R / L), Bessel function of the second kind Y n (k m R / L) and their derivatives. Among them, the second kind of imaginary quantity Bessel function K n (k m R / L), Bessel function of the second kind Y n (k m The value of R / L) can be determined by ...

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Abstract

The invention discloses a method for calculating the natural frequency of marine pipeline natural vibration. The specific steps are: measuring the radius R, length L, wall thickness h and density ρ of the marine pipeline; determining the Young's modulus E and Poisson's ratio of the marine pipeline material μ; measure the density ρ of seawater f ; Calculate the natural frequency of the free vibration of the ocean pipeline when the fluid-structure interaction effect is considered by the natural frequency calculation formula. The invention is based on the plate and shell theory, considers the influence of the fluid-solid coupling effect of the fluid and the shell structure on the free vibration of the shell, analyzes the free vibration phenomenon of the marine pipeline as a whole, and proposes a more reasonable and simpler natural frequency calculation method.

Description

technical field [0001] The invention belongs to the field of marine engineering, and in particular relates to a method for calculating the natural frequency of natural vibration of an ocean pipeline that simultaneously considers the fluid-structure coupling effect and the influence of the initial curvature of the pipeline. Background technique [0002] Subsea pipelines are laid on the rugged seabed. Due to the combined action of the uneven seabed profile and the bottom current of the seabed, in some areas of the pipeline laying path, the pipelines are exposed to form suspended sections. Under the long-term action of environmental load, the suspended section is very easy to fatigue failure. Among various failure modes, vortex-induced vibration has the highest probability of occurrence and the greatest hazard. [0003] Under the above working conditions, the length of the suspended part of the pipeline is long, and the initial curvature of the pipeline has a great influence o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00G06F17/12
CPCG01H17/00G06F17/12Y02T90/00
Inventor 薛江红姚思诗何赞航夏飞金福松
Owner JINAN UNIVERSITY
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