Method for changing inherent frequency of underwater residence system to suppress vortex-induced oscillation

A natural frequency, vortex-induced technology, applied in the direction of underwater operation equipment, measuring devices, instruments, etc., to achieve the effect of avoiding vortex-induced oscillation

Pending Publication Date: 2021-03-19
CHINA ACAD OF LAUNCH VEHICLE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the underwater mooring body has strict requirements on its hydrodynamic shape, the previous method of changing the characteristic structure is not applicable

Method used

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  • Method for changing inherent frequency of underwater residence system to suppress vortex-induced oscillation
  • Method for changing inherent frequency of underwater residence system to suppress vortex-induced oscillation
  • Method for changing inherent frequency of underwater residence system to suppress vortex-induced oscillation

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Embodiment Construction

[0040] The present invention will be further elaborated below in conjunction with embodiment.

[0041] The present invention proposes a method for suppressing vortex-induced oscillations by changing the natural frequency of the underwater resident system. The length of the suspension cable is adjusted by a suspension cable retractable mechanism, and the frequency domain characteristics of its movement are obtained through Fourier analysis of the acceleration signal of the tethered body. The vibration signal caused by hydrodynamic force is decoupled through natural frequency calculation to obtain the water flow velocity, and the derived vortex-induced oscillation suppression interval is used to adjust the natural frequency of the system to achieve the purpose of suppressing vortex-induced oscillation.

[0042] A method for suppressing vortex-induced oscillations by changing the natural frequency of an underwater resident system specifically includes the following steps:

[0043...

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Abstract

The invention relates to a method for changing the inherent frequency of an underwater residence system to suppress vortex-induced oscillation, and belongs to the field of underwater vortex-induced oscillation suppression. The method comprises the steps: establishing a residence system underwater, wherein the system comprises an underwater mooring body, a suspension cable, a hoisting mechanism, anacceleration sensor, a controller and an anchor block, the length of the suspension cable is adjusted through the hoisting mechanism, the frequency domain characteristics of movement of the underwater mooring body are obtained through Fourier analysis of acceleration signals of the underwater mooring body, vibration signals caused by hydrodynamic force are decoupled through inherent frequency calculation, the water flow speed is obtained, and the inherent frequency of a system is adjusted through a vortex-induced oscillation suppression interval obtained through derivation, and the purpose ofsuppressing vortex-induced oscillation is achieved.

Description

technical field [0001] The invention belongs to the field of underwater vortex-induced oscillation suppression, and relates to a method for suppressing vortex-induced oscillation by changing the natural frequency of an underwater dwelling system. Background technique [0002] Vortex-induced oscillation is a widespread fluid oscillation phenomenon, which will cause periodic oscillation of the structure and affect its life, and in severe cases, the structure will be damaged. At present, the vortex-induced oscillation suppression measures for bridges or high-rise buildings have been relatively perfect, but due to the upgrading of the emphasis on the marine field, new requirements for the suppression of vortex-induced oscillations of underwater tethered bodies have been put forward. Because the underwater mooring body has relatively strict requirements on its hydrodynamic shape, the previous method of changing the characteristic structure is not applicable. Contents of the inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00B63C11/52
CPCG01H17/00B63C11/52
Inventor 王大鹏俞启东陆宏志徐志程蔡昱杨玉生赵静詹景坤魏洪亮李明王琳娜潘健
Owner CHINA ACAD OF LAUNCH VEHICLE TECH
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