Bidirectional forced vibration experimental apparatus for deep sea riser segment model under action of uniform flow

Abstract

The invention is suitable for the field of the oceanographic engineering and provides a bidirectional forced vibration experimental apparatus for a deep sea riser segment model under the action of uniform flow. The bidirectional forced vibration experimental apparatus comprises a deep sea riser module, end part prosthesis modules, horizontal sliding modules, vertical sliding modules and a measurement analysis control module, wherein both ends of the deep sea riser module are respectively connected with the end part prosthesis modules; the vertical sliding modules are respectively connected with the corresponding end part prosthesis modules and the corresponding horizontal sliding modules; the horizontal sliding modules are fixedly connected with the bottom of a trailer; and the measurement analysis control module is arranged on the trailer and is connected with the end part prosthesis modules, the horizontal sliding modules and the vertical sliding modules. In the invention, large-scale riser segments are adopted, so that a test Reynolds number is in the range of 106 for avoiding the scale effect; the double freedom degree forced movement is adopted to truly simulate the vortex-induced vibration form of a riser; and meanwhile, due to the adoption of end part prosthesis, the problem of the boundary effect at both sides of the model in an experiment is solved.

Description

technical field

[0001] The invention belongs to the field of marine engineering, and in particular relates to a bidirectional forced vibration experiment device of a deep-sea riser section model under the action of uniform flow. Background technique

[0002] The risers in the actual marine environment are all slender and flexible structures, which will generate vortex-induced vibrations under the action of ocean currents. This kind of vibration is self-excited for the whole riser; but if considering that each section can be regarded as a segment of a rigid body, then this kind of vibration is a forced oscillation. Since each small part of the flexible riser can be regarded as a rigid cylinder, if we want to study the vortex-induced vibration characteristics of the slender flexible marine riser under the action of the ocean current in the real environment, we can start with the simple microscopic problem, namely The force, motion response, and wake shape of a rigid cylinder ...

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