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Flexible riser model for actual Reynolds number vortex-induced vibration test

A technology of vortex-induced vibration and flexible riser, which is applied in the field of marine engineering, can solve the problems of unsuitable use of fiber grating sensors, difficult vortex-induced vibration testing, and small diameter of the riser model, so as to achieve true and reliable strain data and avoid scale effects , small size effect

Active Publication Date: 2013-11-06
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After analysis, the deficiencies of this riser model manufacturing technology are: 1. The diameter of the riser model is very small, it is difficult to effectively carry out the vortex induced vibration test under the real Reynolds number, and the scale effect is obvious
2. FRP has anisotropic properties and is not suitable for fiber grating sensors

Method used

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  • Flexible riser model for actual Reynolds number vortex-induced vibration test
  • Flexible riser model for actual Reynolds number vortex-induced vibration test
  • Flexible riser model for actual Reynolds number vortex-induced vibration test

Examples

Experimental program
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Embodiment

[0020] Such as figure 1 and figure 2 As shown, this embodiment includes: a fiber grating sensing component 1, a connecting tube 2, a heat shrinkable tube 3, several expansion tubes 4 and a smooth tube 5, wherein: the fiber grating sensing component 1 is connected to the surface of the connecting tube 2 , the heat-shrinkable tube 3 is wrapped outside the connecting tube 2 connected with the fiber grating sensing component 1, several diameter-expanding tubes 4 are sleeved outside the heat-shrinkable tube 3 and connected in series in sequence, and the smooth tube 5 is wrapped around several diameter-expanding tubes 4 outside.

[0021] Such as image 3 As shown, the fiber grating sensing component 1 is composed of four fiber strings 6, each fiber string 6 is arranged axially along the riser model and connected to the surface of the riser model, and the fiber strings 6 are packaged in a waterproof packaging method.

[0022] The optical fiber string 6 includes: several grating s...

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PUM

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Abstract

The invention relates to a flexible riser model for an actual Reynolds number vortex-induced vibration test in the technical field of oceanographic engineering, which comprises an optical fiber grating sensor module, a connecting pipe, a heat-shrinkable pipe, a plurality of diameter expanding pipes and a smooth pipe, wherein the optical fiber grating sensor module is connected with the surface of the connecting pipe, the heat-shrinkable pipe covers the connecting pipe, the diameter expanding pipes are sheathed outside the heat-shrinkable pipe and are sequentially and serially connected, and the smooth pipe covers the diameter expanding pipes. The flexible riser model for the actual Reynolds number vortex-induced vibration test has the advantages that the model can bear high flow rate, high-order mode vortex-induced vibration can be excited and measurement data is true and reliable.

Description

technical field [0001] The invention relates to a device in the technical field of marine engineering, in particular to a flexible riser model for a real Reynolds number vortex-induced vibration test. Background technique [0002] According to the knowledge of fluid mechanics, when a columnar structure is placed in a certain speed of incoming flow, alternate vortices will occur on both sides of it. Associated with the creation and discharge of vortices, the column is subjected to lateral and flow-wise pulsating pressures. If the column is elastically supported at this point, the pulsating fluid forces will induce vibrations in the column, which in turn will change the structure of its wake. This fluid-structure interaction problem is called vortex-induced vibration. For example, under the action of ocean currents, vortex-induced vibrations will occur on flexible pipes such as offshore platform risers, tow cables, submarine pipelines, spar platform buoys, mooring cables, et...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/02
Inventor 付世晓李曼李鲤周青
Owner SHANGHAI JIAO TONG UNIV
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