Self-excited oscillation test device of deepwater buoy platform and test method

Abstract

The invention relates to a research method of an ocean deepwater buoy platform, and in particular relates to a self-excited oscillation test device of a deepwater buoy platform and a test method. The device comprises a test model cylinder arranged in a water tank of a current generation system; the test model cylinder adopts one section of a hard cabin of the buoy platform, and the length of the cylinder is 1/2-2/3 of the thread pitch of a spiral plate; the lower end of the cylinder is connected with a bottom plate of the water tank through four springs, and a three-way acceleration sensor is mounted at the upper end of the cylinder; and the two horizontal directions of the three-way acceleration sensor are along the flow velocity direction of the fluid and vertical to the flow velocity direction respectively. Through the invention, a test verification device and a test verification method for the self-excited oscillation of the deepwater buoy platform are established so as to establish a self-excited oscillation theory of the deepwater buoy platform and obtain a specific scheme for studying the self-excited oscillation of the deepwater buoy platform.

Description

technical field [0001] The invention relates to a research method of a marine deep-water buoy platform, in particular to a self-excited oscillation test device and a test 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 undergoes cross-flow motion (vortex-induced motion or wave-induced cross-flow motion), the relative velocity between the fluid and the platform is no longer perpendicular to the motion direction of the platform, and an angle of attack α is generated, thereby causing a lift force in the cross-flow direction. is a function of the angle of attack ( in is the cross-flow oscillation velocity of the buoy platform, U is the flow velocity), when the flow velocity is constant, the angle of attac...

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