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An Advanced Measurement System for Vortex-Induced-Vibrations Characterization in Large-Scale Risers


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Ordonez, M, Sonnaillon, M, Murrin, D, Bose, N and Qiu, W 2007 , 'An Advanced Measurement System for Vortex-Induced-Vibrations Characterization in Large-Scale Risers', paper presented at the On The Edge of Tomorrow-MTS/IEEE Oceans 2007, 2-3 October 2007, Vancouver.

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This paper presents the development of an advanced
measurement system for real-time characterization of Vortex
Induced Vibrations (VIV) in large-scale marine risers. Marine
risers play a critical role in offshore oil and gas operations by
transporting mud, debris, and hydrocarbons from the reservoir
to the surface platform. The mechanical structure of the riser
is constantly subject to the effect of vortex shedding produced
by seawater flow, which may result in severe oscillations known
as VIV. At present, the prediction of this potentially destructive
phenomenon is a challenging area of research that has gained
special attention.
While there have been significant research contributions on
vortex induced vibrations on small riser models (8-10 m in
length), the number of experiments on large-scale risers is
limited, mainly due to technical complexity, logistics, and cost
involved in large scale testing. Furthermore, the experiments
that have been carried out are often proprietary and their
publication in scientific literature has been limited. High mode
results have been a challenge since it is generally accepted that at
least five accelerometers are required to accurately map a cycle,
and most of the riser models have been instrumented with no
more than ten or twenty accelerometers due to the associated
technical challenges. The advanced system described herein is
modular and has been tested with sixty-four accelerometers,
theoretically capable of mapping 25 modes of vibration. This
is, therefore, a significant development towards understanding
the vortex shedding phenomenon at high modes.
A complete description and design considerations for this advanced
measurement system is presented in this paper. This
includes aspects such as system architecture, hardware and software
design, mounting procedure, and communication protocol
for an actual application.

Item Type: Conference or Workshop Item (Paper)
Authors/Creators:Ordonez, M and Sonnaillon, M and Murrin, D and Bose, N and Qiu, W
Keywords: marine riser, instrumentation, deep water
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