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Technology
Assessment & Research (TA&R) Program
| Project Number |
360 |
| Date of Summary |
September 7, 2004 |
| Subject |
Riser Interaction
Model: A Combined T/F Domain Model |
| Performing Activity |
Texas A&M University,
Offshore Technology Research Center (OTRC) |
| Principal Investigator |
John Niedzwecki |
| Contracting Agency |
Minerals Management Service |
| Estimated Completion |
September 2004 |
| Description |
The primary object
of this research investigation was the development of a new analysis
approach to the hydrodynamic modeling of complex fluid-structure interaction
phenomena, such as the hydrodynamic interaction of closely spaced risers
subject to design seas. Because of the complex nature of the problem, a
combined time/frequency domain approach was selected as the basis for the
analysis. The next logical steps in the development of this methodology were
motivated by the need in offshore design to more precisely address the
frequency dependence of key parameters such as added mass, stiffness and
damping, as well as, the need to exploit the advantages of using fully
correlated signals in the process of design parameter estimation. Based an
understanding of the analysis requirements and the initial interpretation of
some existing multiple riser data, it was concluded that a suitable data set
for marine risers was not available. Consequently, other test data sets were
considered for possible use and it was determined that it would be possible
to utilize a series of recently performed model tests involving
complementary model tests of a rigid hull model and its compliant platform
counterpart. The reverse system identification model has been developed; it
can be applied to investigate complex hydrodynamic aspects of marine riser
and floating platforms systems. The final objective was to clearly document
some of the subtle aspects of the methodology for successful application and
interpretation of practical problems. This project has been completed. |
| Progress |
The project is now
been completed and reports of the findings of this project can be downloaded
from the following reports listed. |
| Report |
AA
(8 pages)
 |
I.A. Sibetheros and
J.M. Niedzwecki, System Analysis of the Interactive Behavior of a Pair of
Flexible Cylinders under Unidirectional Wave Loading, Department of Civil
Engineering, Texas A&M University, College Station, Texas, 2003. |
|
AB
(19
pages)
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P.F. Liagre and
J.M. Niedzwecki, Estimating Nonlinear Coupled Frequency Dependence
Parameters in Offshore Engineering, Department of Civil Engineering, Texas
A&M University, College Station, Texas, April 2003. |
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AC
(29
pages)
|
I.A. Sibetheros and
J.M. Niedzwecki, Analysis of Single and Tandem Cylinder Data Using
Orthogonal Volterra Model Approach, Department of Civil Engineering, Texas
A&M University, College Station, Texas, 2003. |
|
AD (29 pages)
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P.F. Liagre and
J.M. Niedzwecki, System Identification of Distributed-Parameter Marine Riser
Models, Department of Civil Engineering, Texas, A&M University, College
Station, Texas, July 2002. |
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AE (38 pages)
|
Niedzwecki, J.M. "Riser
Interaction Model: A Combined Time Frequency Domain Approach." Final Report,
Texas A&M University. 38 pp. November 2004. |
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