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 of the motion characteristics of the riser with virtual structural parameters, to 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 with a predetermined period, the scale effect is large, and in short, it cannot be simulated more realistically Problem with risers in real sea state

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