Technology
Assessment & Research (TA&R) Program
| Project
Number |
36 |
| Date of Summary |
September 30, 1985 |
| Subject |
Strumming of Risers |
| Performing Activity |
Massachusetts Institute of Technology |
| Principal Investigator |
Dr. J. Kim Vandiver |
| Contracting Agency |
Naval Civil Engineering
Laboratory |
| Estimated Completion |
Complete |
| Description |
This is an adjunct to Project No. 2, Dynamic Response of Offshore
Structures. Strumming experiments were conducted on long pipes in a tidal estuary where
currents range to 1.5 knots. These experiments will simulate the strumming characteristics
of production risers which may be used in deepwater operations. Future plans include
possible testing of riser behavior in deep water where they can be vertically oriented. |
| Progress |
Complete. A peculiar experimental
observation deduced from the Castine data is that the in-line response frequencies do not
always correspond to the structures natural frequencies. Instead, they are equal to double
or sum of some of the cross-flow response frequencies for both lock-in and non lock-in
cases. Additional studies were conducted on these observations. |
| Reports |
AA (14 pages)
 |
Vandiver, J. K., Griffin, O. M.,
Measurements of the Vortex Excited Strumming Vibration of Marine Cables, Ocean Structural
Dynamics Symposium, Corvallis, Oregon, September 1982. |
| AB (86 pages)
|
McGlothlin, J. C., Drag
Coefficients of Long Flexible Cylinders Subject to Vortex Induced Oscillations, Masters
Thesis, Massachusetts Institute of Technology, Cambridge, Massachusetts, January 1982. |
| AC (88 pages)
|
Jong, J. Y., Vandiver, J. K.,
Response Analysis of the Flow- Induced Vibration of Flexible Cylinders Tested at Castine,
Maine, in July and August 1981, Massachusetts Institute of Technology, Cambridge,
Massachusetts, January 15, 1983. |
| AD (128 pages)
|
Vandiver, J. K., Griffin, O. M.,
Flow-Induced Vibration of Taut Marine Cables with Attached Masses, cr 84.004, Naval Civil
Engineering Laboratories, Port Hueneme, California, November 1983. |
| AE (8 pages)
|
Vandiver, J. K., Prediction of
the Dynamic Response in Riser and Cables, Massachusetts Institute of Technology,
Cambridge, Massachusetts, April 25, 1984. (Progress Report) |
| AF (3 pages)
|
Vandiver, J. K., Prediction of
the Dynamic Response in Riser and Cables, Massachusetts Institute of Technology,
Cambridge, Massachusetts, November 1984. |
| AG (5 pages)
|
Vandiver, J. K., Prediction of
the Dynamic Response in Riser and Cables, Massachusetts Institute of Technology,
Cambridge, Massachusetts, March 28, 1985. |
| AH (31 pages)
|
Holler, R. A., Drag Measurements
of Long Cables in the Ocean, Naval Air Development Center, Warminster, Pennsylvania, March
1984. (Preliminary Report) |
| AI (166 pages)
|
Jong, Jen-Yi, The Quadratic
Correlation Between In-Line and Cross- Flow Vortex Induced Vibrations of Long Flexible
Cylinders, Doctoral Thesis, Massachusetts Institute of Technology, Cambridge,
Massachusetts, August 1984. |
| AJ (8 pages)
|
Vandiver, J. K., Prediction of
Lockin Vibration on Flexible Cylinders in Shear Flow, Proceedings, 1985 Offshore
Technology Conference, Paper No. 5006, Houston, Texas, May 1985. |
| AK (9 pages)
|
Vandiver, J. K., Jong, Jen-Yi,
The Identification of the Quadratic System Relating Cross-Flow and In-Line Vortex Induced
Vibration, ASME Journal of Dynamic Stress, Measurement and Control, Winter 1985. |
|
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