Vortex-induced vibration test, measurement and analysis system for deep-sea flexible riser model

Abstract

The invention relates to a vortex-induced vibration test, measurement and analysis system for a deep-sea flexible riser model in the technical field of oceanographic engineering, which is characterized in that the system consists of an optical fiber grating sensor module, an optical fiber expanding slot, an optical fiber demodulator, a wireless transmission module and an optical signal data acquisition device which are sequentially cascaded with each other, wherein the optical fiber grating sensor module is connected with the riser module, the optical fiber expanding slot, the optical fiber demodulator, the wireless transmission module and the optical signal data acquisition device are arranged on a trailer, the optical fiber grating sensor module generates optical signals, the optical signals enter the optical fiber demodulator through the optical fiber expanding slot, the optical fiber demodulator demodulates the optical signals into digital signals, and the optical signal data acquisition device records, analyzes and stores the digital signals. The vortex-induced vibration test, measurement and analysis system for the deep-sea flexible riser model can realize the remote control acquisition of strain and stress situation generated by riser vortex-inducted vibration and can analyze and store the data in real time.

Description

technical field [0001] The invention relates to a device in the technical field of marine engineering, in particular to a deep-sea flexible riser model vortex-induced vibration test measurement and analysis system. Background technique [0002] According to the knowledge of fluid mechanics, when a columnar structure is placed in a certain speed of incoming flow, alternate vortices will occur on both sides of it. Associated with the creation and discharge of vortices, the column is subjected to lateral and flow-wise pulsating pressures. If the column is elastically supported at this point, the pulsating fluid forces will induce vibrations in the column, which in turn will change the structure of its wake. This fluid-structure interaction problem is called vortex-induced vibration. For example, under the action of ocean currents, vortex-induced vibrations will occur on flexible pipes such as offshore platform risers, tow cables, submarine pipelines, spar platform buoys, moor...

AI Technical Summary

Problems solved by technology

After analysis, the deficiencies of the riser model manufacturing technology are: 1. The acceleration sensor has a certain weight, and the arrangement on the surface of the riser model will increase the quality of the riser and affect the vortex-induced vibration characteristics of the riser

2. It is impossible to measure the force of the riser model in real time

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