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Self-excited oscillation analysis method of deep-water buoy platform

A technology of self-excited oscillation and analysis method, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as excessive density of test medium, unsatisfactory results, distortion, etc., to achieve perfect theory and research methods, Effectiveness in solving methodological problems in theoretical analysis and numerical simulation studies

Inactive Publication Date: 2012-06-20
OCEAN UNIV OF CHINA
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Problems solved by technology

However, due to the limitations of the test conditions, satisfactory results cannot be obtained even by using test methods.
Because the deepest test pool is only 10 meters deep at present, then the platform with a water depth of 3000 meters can only be used for 300:1 model tests, such a large-scale fluid test will cause serious distortion, because there is no one that can satisfy the similar relationship. test medium
Usually the pool test can only use water, which causes the density of the test medium to exceed 27000000 times the similar relationship that should be satisfied, and if the mooring system is scaled down to 1 / 300, there is no available material to replace it
Therefore, the research on flow-induced oscillation numerical simulation of buoy platform is still an unresolved problem

Method used

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  • Self-excited oscillation analysis method of deep-water buoy platform
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  • Self-excited oscillation analysis method of deep-water buoy platform

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Embodiment Construction

[0072] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0073] Self-excited vibration is a form of movement in which the structure absorbs energy from the outside due to its own initial disturbance and continues to vibrate. In the steady flow field, the buoy platform moves vertically to the fluid flow direction due to some disturbance, resulting in the flow velocity and platform. The direction of motion is not vertical, forming an angle of attack, which causes lift in the cross-flow direction. Since the angle of attack changes with the velocity of the platform's cross-flow movement, alternating lift forces are formed. Under the action of the alternating lift force, the platform will reciprocate across the flow direction, which is the self-excited oscillation of the buoy platform. The present invention is based on the theory of self-excited vibration and jumping vibration, and simultaneously consi...

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Abstract

The invention relates to a research method of a marine deep-water buoy platform and specifically, in particular to a self-excited oscillation analysis method of a deep-water buoy platform. According to the self-excited oscillation analysis method, a self-excited oscillation concept of the deep-water buoy platform is provided and an analysis model of the self-excited oscillation of the deep-water buoy platform is established, therefore the problems of self-excited oscillation theoretical analysis and a numerical simulation research method of the deep-water buoy platform are further solved, and a theory and a research method of flow-induced oscillation of the deep-water buoy platform are further perfected.

Description

technical field [0001] The invention relates to a research method of an ocean deep-water buoy platform, in particular to a self-excited oscillation analysis method of a deep-water buoy platform. Background technique [0002] The outer wall of the hard cabin of the deep-water buoy platform (Spar) is welded with a spiral plate to control the vortex-induced motion, resulting in asymmetric geometry of the cross-section of the buoy platform and a large diameter. When the platform moves in the cross-flow direction (vortex-induced motion or wave-induced cross-flow motion), the relative velocity between the fluid and the platform is no longer perpendicular to the movement direction of the platform, and an angle of attack is generated, thereby causing a lift force in the cross-flow direction, which is The function of the angle of attack, when the flow rate is constant, the angle of attack changes with the change of the cross-flow velocity of the platform, therefore, the lift force an...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 黄维平周阳杨超凡孙希张艳君
Owner OCEAN UNIV OF CHINA
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