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Time-dependent internal flow coupling method for controlling transverse and longitudinal vibration of marine oil delivery risers

A lateral vibration and riser technology, applied in mechanical oscillation control, non-electric variable control, control/regulation systems, etc., can solve problems such as inconsistent experimental results, no construction, and gap in riser vibration.

Inactive Publication Date: 2015-02-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vibration of the riser of marine oil transportation is the main cause of the fatigue failure of the riser. At present, most of the research on the riser is still in the theoretical analysis. The riser research experiment, but the experimental environment can only simply simulate the marine riser, and there is a big gap with the riser vibration in the actual project, and the relevant experimental conclusions are not uniform
However, there is no relevant physical or semi-physical simulation system for control at home and abroad.

Method used

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  • Time-dependent internal flow coupling method for controlling transverse and longitudinal vibration of marine oil delivery risers
  • Time-dependent internal flow coupling method for controlling transverse and longitudinal vibration of marine oil delivery risers
  • Time-dependent internal flow coupling method for controlling transverse and longitudinal vibration of marine oil delivery risers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0040] Such as figure 1 As shown, a method for controlling the transverse and longitudinal vibration of an offshore oil riser coupled with time-varying internal flow includes the following steps:

[0041] S1 uses Matlab GUI programming on the PC to provide visual operation and simulate the vibration interface of the riser. The specific steps are as follows:

[0042] S1.1 Use the differential discretization method to discretize the PDEs equations, and calculate the differential operation results of the riser model, which are divided into discrete operations on the current disturbance f(x, t) and discrete operations on the riser mathematical equations, specifically including The following steps:

[0043] S1.1.1 Divide the interval [a,b] on the x-axis into N equal parts with a step size of h=△x=(b-a) / N, and the Taylor expansion of the backward difference can be constructed at the Nth grid point formula can be written as:

[0044] f ...

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Abstract

The invention discloses a time-dependent internal flow coupling method for controlling transverse and longitudinal vibration of marine oil delivery risers. The time-dependent internal flow coupling method includes simulating riser vibration interfaces on PC (personal computers) by means of programming by the aid of MATLAB GUI (graphical user interfaces); parsing mathematical models of the marine risers by the aid of a numerical analysis process; transmitting differential computation results to control modules; allowing users to select control modes according to data; generating corresponding control algorithms; enabling the control modules to transmit control signals and feed the control signals to the PC via serial ports so as to control the vibration of the risers. The time-dependent internal flow coupling method has the advantage that the two-dimensional vibration of the marine oil delivery risers can be observed by the aid of the time-dependent internal flow coupling method in real time.

Description

technical field [0001] The invention belongs to the field of safe production of marine oil delivery risers, in particular to a method for controlling transverse and longitudinal vibrations of marine oil delivery risers coupled with time-varying internal flows. Background technique [0002] With the world's increasing demand for energy, offshore oil and gas extraction and transportation are becoming more and more important. While deep-sea oil and gas resources bring abundant energy to human beings, they are also accompanied by a large number of accidents. The vibration of the riser of marine oil transportation is the main cause of the fatigue failure of the riser. At present, most of the research on the riser is still in the theoretical analysis. The riser research experiment, but the experimental environment can only simply simulate the marine riser, and there is a big gap with the riser vibration in the actual project, and the relevant experimental conclusions are not unif...

Claims

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Application Information

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IPC IPC(8): G05D19/02
Inventor 刘屿赵志甲许冰霜李林野
Owner SOUTH CHINA UNIV OF TECH
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