Test device with controllable vibrational degrees of freedom for vortex-induced vibration of cylinders

Abstract

The invention relates to a test device for research on vibration of construction in a flow field, and specifically to a test device with controllable vibrational degrees of freedom for vortex-induced vibration of cylinders. The test device comprises elastic supports arranged on a pedestal and a model pipeline arranged on the elastic supports, wherein, the elastic support comprises a rack and a pipe clamp for installing the model pipeline, a spring core bar is provided between the rack and the pipe clamp, a spring is sleeved on the spring core bar, chutes are provided on the rack, slide blocks are provided in the chutes, and the slide blocks are connected with the pipe clamp through the spring core bar. According to the invention, vibration at two directions can be controlled respectively, which enables the problem that fluid-solid coupling can not be tested in research on vortex-induced vibration to be overcome.

Description

technical field [0001] The invention relates to a test device for studying the vibration of a structure in a flow field, in particular to a cylindrical vortex-induced vibration test device with controllable vibration degrees of freedom. Background technique [0002] Vortex-induced vibration is a special vibration form of a cylinder in the flow field, and it is the vibration caused by the vortex shedding at the wake of the cylinder. The research on vortex-induced vibration has a history of more than 60 years, but in recent years, the riser vortex-induced vibration problem caused by the development of deep-water oil and gas in the ocean has set off a new round of cylinder vortex-induced vibration research upsurge. [0003] The study found that the traditional vortex-induced vibration theory cannot well explain the special vortex-induced vibration phenomenon of deepwater risers, such as large vibration amplitude. The traditional vortex-induced vibration theory holds that the r...

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Problems solved by technology

[0016] a) The vortex-induced vibration test that can independently control the unidirectional vibration cannot be carried out. Therefore, it cannot be used for the experimental research on the influence of the flow-wise (lateral) vibration of the elastic cylinder on the transverse (flow-wise) vortex-induced vibration, and cannot reveal the flow direction of the elastic cylinder. The essential characteristics of (transverse) fluid-solid coupling effects on vortex discharge, vortex-induced lift and drag forces cannot reveal the fluid-solid coupling characteristics of flow-direction and transverse coupled vibrations and their influence on vortex-induced vibrations

[0017] b) The fluid-solid coupling characteristics of large displacement vortex-induced vibration of deep water risers cannot be simulated. Large displacement means geometric nonlinearity, and the linear small displacement assumption is no longer applicable. Therefore, the traditional vortex-induced vibration test device is not suitable for strong geometric nonlinearity. Research on vortex-induced vibration of deepwater riser

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