Simulation device for vortex-induced vibration of submarine pipeline and experimental method

A technology of vortex-induced vibration and submarine pipelines, which is applied to measuring devices, instruments, and measuring ultrasonic/sonic/infrasonic waves, etc. It can solve the problem of difficult to achieve accurate damping measurement, limit the influence of damping vortex-induced vibration, and frictional damping is difficult to eliminate and change, etc. problems, to achieve the effect of convenient data post-processing, increasing types and quantities

Active Publication Date: 2017-05-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually frictional damping changes with the vibration amplitude, so it is difficult to achieve accurate measurement of damping in experiments; at the same time, frictional damping is difficult to eliminate and change, which greatly limits the research on the influence of damping on vortex induced vibration

Method used

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  • Simulation device for vortex-induced vibration of submarine pipeline and experimental method

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Experimental program
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Effect test

Embodiment 1

[0038] Such as figure 1 As shown, a submarine pipeline vortex-induced vibration simulation device includes a water tank, a support frame 6, a pipeline model motion mechanism 5 and a test system;

[0039] The support frame 6 is composed of a crossbeam 61 erected on the upper edge of the water tank, two vertical beams 62 vertically arranged on the crossbeam 61, and a cross brace 63 arranged at the lower part of the two vertical beams 62; Described support frame 6 is the fixed rectangular frame that described crossbeam 61, two vertical beams 62, and cross brace 63 constitute; (cross brace 63, two vertical beams 62 are all arranged in tank interior)

[0040] The pipeline model motion mechanism includes a simulated pipeline 51, a linear guide rail 52, a guide rail slider 53 and a cross bar 54; the guide rail slider 53 has four pieces, which are symmetrically fixed on the two vertical beams 62 respectively; There are two linear guide rails 52, which are respectively installed on th...

Embodiment 2

[0049] In order to simulate the vortex-induced vibration of the pipeline under controllable damping, a control damping device 8A is added to the vortex-induced vibration simulation device of the submarine pipeline disclosed in Embodiment 1, and the structure is: an additional spring 84 is provided in the middle of the cross bar 54 , now the main spring and the additional spring work at the same time; the upper side of the additional spring 84 is equipped with a lead screw pair 83, and the lead screw pair 83 is connected with the servo motor 81 on which the speed reducer 82 is installed; the servo motor is connected with the The control host 1 is connected; the control host 1 can control the rotation speed of the servo motor 81, and then adjust the length of the lead screw 83, thereby adjusting the length of the additional spring 84.

[0050] Specifically, the lead screw nut of the lead screw pair 83 is fixed on one side of the speed reducer 82 , and the lower end of the lead sc...

Embodiment 3

[0059] In order to simulate the forced vibration of the submarine pipeline, the vortex-induced vibration simulation device for the submarine pipeline disclosed in Embodiment 2 is modified, and the main spring 55 is replaced by a rigid connecting rod, the additional spring 84 is removed, and the screw nut of the lead screw 83 is fixed on One side of the speed reducer 82 is connected with the cross bar 63 after the lower end of the leading screw is connected to the bearing.

[0060] The steps of using this device to simulate the forced vibration of submarine pipelines are as follows:

[0061] 1) Apply a downward displacement to the analog pipeline 51, record the corresponding output voltage of the laser displacement sensor, and obtain the calibration coefficient between the displacement and the voltage by fitting, import the calibration coefficient, and calibrate the laser displacement sensor;

[0062] 2) Add water to the water tank to the depth of the test water, which can be a...

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Abstract

The invention discloses a simulation device for vortex-induced vibration of a submarine pipeline and an experimental method. The simulation device comprises a water tank, a rectangular support frame, a pipeline model movement mechanism and a test system. The support frame is set up on the water tank. The pipeline model movement mechanism includes a simulation pipeline, two linear guide rails and a cross bar which constitute a rectangle. The two linear guide rails are mounted on the support frame respectively through guide rail blocks, and the cross bar is arranged on the top and connected to an upper beam of the support frame by means of two main springs. Test instruments in the test system are installed and then connected with a control host. The vortex-induced vibration of the pipeline under controllable damping can be simulated for the structure by installing a damping control device. When an experiment is carried out by the device, the instrument is calibrated first, and the damping coefficient of a free vibration system and the stiffness coefficient of the springs are measured by the device in a water injecting experiment. The device can be used to systematically study the vortex vibration trigger and amplitude and other issues, and the results can be referred to in the engineering design of a submarine pipeline.

Description

technical field [0001] The invention relates to the technical field of marine engineering, in particular to a vortex-induced vibration simulation device and an experimental method for a submarine pipeline. Background technique [0002] In marine engineering, when the ocean current passes through the suspended submarine pipeline, alternating vortex shedding will be formed behind it, resulting in periodic force. The suspended subsea pipeline acts as a spring-damper system with a specific frequency. When the natural frequency of the pipeline is close to the vortex shedding frequency of the fluid, the submarine pipeline will spontaneously generate vortex-induced vibration, and the long-term effect will lead to fatigue damage of the pipeline. [0003] Vortex-induced vibration is a complex fluid-structure interaction problem, and laboratory simulation is an important research method. The usual experimental simulation devices include pipeline models, spring groups, sliding tracks...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
Inventor 臧志鹏及春宁陈同庆
Owner TIANJIN UNIV
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