Device for fixing end part of riser model in deep-sea slender flexible riser vortex-induced vibration test

Abstract

The invention relates to a device for fixing the end part of a riser model in a deep-sea slender flexible riser vortex-induced vibration test, which comprises a trailer, a left support device, a right support device, a sliding mechanism, a fixed pulley and a tension system, wherein two ends of the trailer are arranged on a track, and other parts are suspended; the left support device is an integrated structure formed by welding three steel plates and transversely fixedly arranged at the left end of the suspended part on the trailer; the right support device is longitudinally fixedly arranged at the right end of the suspended part on the trailer; the sliding mechanism comprises a base which is fixedly connected with the bottom part of the left support device, two parallel sliding tracks are arranged on the base, and a sliding block is arranged on the two sliding tracks by penetration; the riser model is arranged between the sliding block and the right support device; the fixed pulley which can rotate around a shaft is arranged on the outer side of the steel plate at the bottom part of the left support device; and the tension system comprises a tensiometer, a tensioner and a spring which are connected on the steel plate on the outer side of the left support device in series, and the sliding block is connected with the spring by bypassing the fixed pulley through a steel wire rope. The device is firm and stable, can truly and effectively simulate the riser vortex-induced vibration characteristics in a laboratory and is mainly applied in the field of indoor model test researches of deep-sea slender flexible riser structure vortex-induced vibration.

Description

technical field The invention relates to a vortex-induced vibration model experiment device of a slender and flexible riser, in particular to a fixing device for a standpipe model end of a vortex-induced vibration experiment of a deep-sea slender and flexible riser. Background technique The marine riser structure is widely used in the exploitation of offshore oil and gas resources. It is an important connecting component between the subsea wellhead and the upper engineering facilities, and is used for the transportation of oil and gas resources and various drilling fluids. In recent years, as the exploitation of offshore oil and gas resources has gradually moved to deep sea areas, the slenderness ratio of marine riser structures has continued to increase, and the flexibility characteristics have become more obvious. Under the long-term action of external environmental loads such as more complex currents and waves in the deep sea area, damage is extremely easy to occur. Amon...

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Problems solved by technology

However, due to the different research goals and contents of the above representative experimental works, there are great differences in the specific end setting methods of the riser model, especially in the end constraint form and tension of the riser model. There is a large difference between control and other aspects and actual engineering problems, and this difference mainly depends on the design and installation form of the end fixture of the riser model

If the end fixing device of the standpipe model is not firm enough, it will inevitably cause safety and stability problems of the standpipe model in the experiment, especially it will cause the standpipe model to twist around its axis, resulting in strain measurement in the direction of flow and cross flow. Signal confusion makes it difficult to obtain real vortex-induced vibration experimental measurement data; on the other hand, the end restraint method of the riser model should reflect the actual conditions of the upper platform structure such as vertical heave and horizontal reciprocating motion as much as possible. Otherwise, the results of model experiments will not truly reflect the actual engineering problems

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