A flow-induced oscillation analysis method for deep-water buoy platforms
An oscillation analysis, water buoy technology, used in vibration testing, testing of machine/structural components, measuring devices, etc., to solve problems such as differences, deviations, viscosity and density that cannot be scaled by similar scales
Inactive Publication Date: 2014-10-01
OCEAN UNIV OF CHINA
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[0004] However, the current self-excited oscillation of the buoy platform has not been recognized by everyone. Therefore, the cross-flow oscillation of the buoy platform is considered to be the vortex-induced oscillation caused by vortex shedding, so it is called vortex-induced motion.
However, the results calculated by using the theory and method of vortex-induced vibration of cylinders have a large deviation from the test results. Therefore, the vortex-induced motion of the buoy platform can only be studied by experimental methods at present.
However, due to the limitations of the test conditions, only small-scale model tests can be carried out. However, the viscosity and density of water cannot be scaled according to a similar scale, but can only ensure that the Froude number is similar. Therefore, the test results are consistent with the actual situation. There is a big difference
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[0088] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0089] The flow-induced oscillation of the buoy platform includes two degrees of freedom in the flow direction and the cross-flow direction. It is not only the vortex induced oscillation caused by vortex shedding, but also includes the self-excited oscillation. Therefore, the flow-induced oscillation analysis of the buoy platform should include the coupling analysis of vortex-induced oscillation and self-excited oscillation. Because the vortex-induced oscillation causes self-excited oscillation, and the self-excited oscillation has a greater impact on the formation and shedding of the vortex, thus having a greater impact on the vortex-induced oscillation. The invention is based on the theory of vortex-induced vibration and jumping vibration, and establishes a flow-induced oscillation analysis method of the buoy platform from the perspective o...
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The invention relates to a research method of an ocean deep-water floating buoy platform, and particularly relates to a flow-induced oscillation analysis method of a deep-water floating buoy platform. In the vortex-excited oscillation and self-excited oscillation generated by vortex discharge are simultaneously considered, the different properties of pulse towing forces in vortex discharge locking region and non-locking region are also considered, specific calculation steps for flow-induced oscillation analysis of the floating buoy platform based on a mathematical model are provided, and the theory and numerical analysis method for the research of the flow-induced oscillation of the floating buoy platform are perfected.
Description
technical field [0001] The invention relates to a research method for a marine deep-water buoy platform, in particular to a flow-induced oscillation analysis method for 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 ...
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IPC IPC(8): G01M7/06
Inventor 黄维平周阳段金龙孙希范杰利
Owner OCEAN UNIV OF CHINA