Method for calculating natural frequency of natural vibration of marine pipeline

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: 2021-03-12
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 pipe

Method used

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  • Method for calculating natural frequency of natural vibration of marine pipeline
  • Method for calculating natural frequency of natural vibration of marine pipeline
  • Method for calculating natural frequency of natural vibration of marine pipeline

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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 the marine pipeline based on the plate and shell theory and considering the effect of fluid-solid coupling and the influence of the initial curvature of the pipeline. First, measure the geometric parameters of the ocean pipeline and determine the material parameters of the ocean pipeline, including: the radius R of the ocean pipeline, the length L of the pipeline, the wall thickness h of the pipeline, the elastic modulus E, 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 imaginary parameter 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 imaginary quantity Bessel function K of the second kind n (k m R / L), Bessel function of the second kind Y n (k m The value of R / L) can b...

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Abstract

The invention discloses a method for calculating the natural frequency of natural vibration of a marine pipeline. The method comprises the following specific steps: measuring the radius R, the lengthL, the wall thickness h and the density [rho] of the marine pipeline; determining the Young modulus E and the Poisson's ratio [mu] of the marine pipeline material; measuring the density rhof of seawater; and calculating the free vibration inherent frequency of the marine pipeline through an inherent frequency calculation formula when the fluid-solid coupling effect is considered. Based on the plate-shell theory, the influence of the fluid-solid coupling effect of the fluid and the shell structure on free vibration of the shell is considered, the free vibration phenomenon of the marine pipelineis integrally analyzed, and a more reasonable, simpler and more convenient inherent frequency calculation method is provided.

Description

technical field [0001] The invention belongs to the field of ocean engineering, and in particular relates to a method for calculating the natural frequency of natural vibration of an ocean pipeline considering both the fluid-solid coupling effect and the influence of the initial curvature of the pipeline. Background technique [0002] Submarine pipelines are laid on the rugged seabed. Due to the joint action of factors such as uneven seabed contours and seabed bottom currents, in some areas along the pipeline laying path, the pipeline is exposed to form a suspended section. Under the long-term action of environmental loads, the suspended section is prone to fatigue failure. Among various failure modes, vortex-induced vibration has the highest probability of occurrence and is the most harmful. [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 on its own vibrat...

Claims

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Application Information

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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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