Oblique uniform flow deep sea pipeline segment model bidirectional forced vibration experiment apparatus

Abstract

The invention provides an oblique uniform flow deep sea pipeline segment model bidirectional forced vibration experiment apparatus which comprises a deep sea pipeline module, prosthesis modules, horizontal slide modules, vertical slide modules, a measurement analysis control module and a false bottom module. Two ends of the deep sea pipeline module connect with the end prosthesis modules. The vertical slide modules connect with the end prosthesis modules and the horizontal slide modules. The horizontal slide modules are fixedly connected with a bottom of a trailer. The measurement analysis control module is provided on the trailer, and connects with the end prosthesis modules and two slide modules. The prosthesis modules are fixedly connected with the trailer. According to the invention, through setting a false base plate, a surface effect of a seabed can be simulated; mutual coupling of pipe fittings and a flow field; vibration of two degrees of freedom of forward flow and vertical inflow are considered, and condition of forming a certain inclination between inflow and pipe fitting axis is realized; an experimental condition can reach an actual Reynolds number range.

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 pipeline segmented model flowing obliquely and uniformly. Background technique [0002] Submarine pipelines are laid on the rugged seabed. Due to the inhomogeneity of the seabed contour, seabed undercurrent, tide and other factors, in some areas along the pipeline laying path, the pipeline is exposed to form a suspended section. Under the long-term action of environmental loads, the suspended section is extremely prone to fatigue failure. Among the various failure modes, vortex-induced vibration has the highest probability of occurrence and is the most harmful, that is, the periodic shedding of the vortex on the pipeline causes the lateral and flow-direction alternating external forces acting on the pipeline, causing the object to vibrate. [0003] Under the above working conditions, the height of the ...

AI Technical Summary

Problems solved by technology

However, in order to have a deeper understanding of the vibration of submarine pipelines, the mutual coupling between pipe fittings and flow fields must be taken into account. Unfortunately, few scholars have done work in this area

[0006] Moreover, the existing model tests generally only involve the working condition that the incoming flow is perpendicular to the axis of the pipe fittings to simplify the problem, while the working conditions in which the incoming flow is at a certain inclination angle to the pipe fitting axis in actual sea conditions cannot be considered.

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