Experimental device for simulating lateral self-excited vibration of deep sea riser under uniform flow

Abstract

The invention discloses testing apparatus of simulating lateral self-excited vibration of an evenly flow-down deep-sea stand pipe. Velocity and force of a cylinder are measured by the testing apparatus of simulating lateral self-excited vibration of evenly flow-down deep-sea stand pipe and real motion response signals of the cylinder under the influence of water flow are obtained after equations of motion of the cylinder are solved. The real motion response signals of the cylinder is imposed on a module through a servo motor to ensure motion of the module and therefore the lateral self-excited vibration is simulated. In the test, a horizontal sliding module is used for simulating stream and a vertical sliding module is used for simulating vortex-excited vibration in a vertical direction. Through setting quality, damping and rigidity parameters to simulate structure performance, the test apparatus of simulating lateral self-excited vibration of the evenly flow-down deep-sea stand pipe speeds up schedule of the test and provides a plurality of free degree to selections of stand pipe section modules. The test apparatus of simulating lateral self-excited vibration of the evenly flow-down deep-sea stand pipe reduces scale effect through adopting the stand pipe section with large scale and solves problems of marginal effect of the modules through adopting a prosthetic device at the end portion.

Description

technical field [0001] The invention belongs to the field of marine engineering, and in particular relates to a test device for simulating the lateral self-excited vibration of a deep-sea riser under uniform flow. Background technique [0002] The riser in the actual marine environment is a slender and flexible structure, which will generate vortex-induced vibration under the action of ocean currents. The structural fatigue or possible resonance caused by the vibration will pose a great threat to the safety of marine structures. [0003] The vortex-induced vibration is self-excited for the riser in the ocean. Due to the limitation of real-scale test conditions, the vortex-induced vibration phenomenon of flexible risers is mainly studied through model tests and numerical simulations. The model test divides the flexible riser into multiple sections, assuming that each section is a rigid cylinder, and performs a forced oscillation test or a self-excited oscillation test on the...

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Problems solved by technology

[0005] The present invention aims at the problems existing in the above-mentioned prior art, and provides a test device for simulating the lateral self-excited vibration of a deep-sea riser under uniform flow, aiming at combining model testing and numerical simulation, through force measurement and high-bandwidth feedback, and real-time numerical simulation The motion characteristics of the riser with virtual structural parameters solve the problem that the existing test device is limited to the actual structural performance of the model, and can only carry out forced vibration of a predetermined period, the scale effect is large, and it is impossible to simulate the riser in the actual sea state more realistically.

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