Test device for vortex-induced vibration response of parallel flexible riser

Abstract

The present invention provides a measuring device for the vortex-induced vibration response of a parallel flexible riser. The measuring device is characterized in that: adjustment of a distance between the parallel flexible risers is implemented by rotating the bolts; the magnitude of the dynamic response parameters such as the relevant stress and strain is measured; the angle of the plane formedby two risers with respect to the flow field direction is arbitrarily changed; the conditions of the deep water experimental pool are fully used to simulate the response environment of the vortex-induced vibration; by moving the whole device to make the whole device move relative to the fluid, the uniform flow field and the oscillating flow field are simulated; the magnitude of the pre-tension isadjusted by using a tensioner connected at the end of each flexible riser, and the tensioner acts as a buffer during the vibration process; and the influence of the change of the flow field on the riser during the movement is eliminated by using a baffle. According to the technical scheme of the present invention, the device is easy to install, a modular design is used, adjustment of the distancebetween the two risers is independent of the angle adjustment, and the device is easily improved into a multi-riser vibration test device with good adaptability.

Description

technical field [0001] The present invention relates to a device in the technical field of marine engineering, in particular to a vortex-induced vibration response test device for parallel flexible risers, in particular to a vortex-induced vibration response of parallel flexible risers that can simulate different flow fields in a deep water experimental pool , and a device for measuring the response characteristics of vortex-induced vibration. Background technique [0002] The flexible riser under the offshore platform is an important part of completing various functions of the platform. Under the action of ocean currents and waves, alternate vortices will be generated behind the flexible riser to make the riser vibrate in the direction perpendicular to the flow field, which is called Vortex induced vibration. The flow field changes caused by vortex-induced vibration between multiple flexible risers interact with each other, so that when the distance between the risers is w...

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Problems solved by technology

The former lacks factual basis, and the construction of the model may deviate greatly from the actual situation; the latter has the following disadvantages: most of the standpipes are replaced by two rigid cylinders, which is inconsistent with the actual situation; most of the research on the angle

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