Device for simulating bidirectional self-oscillation under mutual interference of two stand column models under uniform flow

Abstract

The invention discloses a device for simulating bidirectional self-oscillation under mutual interference of two stand column models under uniform flow. The device obtains velocity and stress of a cylinder body through measuring, obtains actual motion response signals under the effect of water flow by solving a motion equation of the cylinder body, and exerts the actual motion signals onto the models through a servo motor to enable the models to move, so that self-oscillation motion is simulated. During test, a horizontally sliding module is used for simulating flow and vortex-induced vibration in the horizontal direction, and a vertically sliding module is used for simulating vortex-induced vibration in the vertical direction. The device sets parameters to simulate model structure performance, avoids messy testing operations in a traditional self-oscillation device, accelerates testing progress, provides large freedom degree to the model selection, simulates special working conditions of bidirectional self-oscillation under mutual interference of two stand columns, adopts a large-scale stand column subsection to reduce scale effect, and adopts an end prosthesis device to solve the problem of model boundary effect.

Description

technical field [0001] The invention relates to the technical field of marine engineering, in particular to a device for simulating two-way self-excited oscillation under mutual interference of two standpipe models 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 actual 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 ...

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Problems solved by technology

[0006] In view of the problems existing in the above-mentioned prior art, the present invention provides a device for simulating two-way self-excited oscillation under mutual interference of two standpipe models under uniform flow, aiming at combining model test and numerical simulation, through force measurement and high bandwidth feedback , real-time numerical simulation...

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