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Technology Assessment & Research (TA&R) Program
 
Project Number 74
Date of Summary March 31, 1991
Subject Drag and Oscillation of Marine Risers and Slack Cables
Performing Activity Naval Research Laboratory
Principal Investigator Dr. Owen M. Griffin
Contracting Agency Minerals Management Service
Estimated Completion Completed.
Description The objective was to investigate the vortex shedding induced oscillation of marine structures in ocean currents. Many types of marine structures are susceptible to vortex-induced oscillations and this project will investigate the dynamics of slack cables and the vortex induced hydrodynamic drag of production risers and LTP tethers. The importance of the proposed research centers on the effects of the amplified hydrodynamic drag forces which accompany vortex-induced vibrations. The drag forces in turn produced larger deflections and increased stresses in support member. The development of design guidelines based on the proposed experimental evaluations will aid in assessing the reliability and fatigue life of these structural components. This project is an adjunct project to Project No. 36.
Progress Complete. The project was extended to consider the dynamic behavior of slack marine risers to include the complex problem of shear current efforts
Reports
AA File in Adobe's Portable Document Format (PDF). (9 pages) Griffin, O. M., Hydrodynamic Drag On and Vibration of Marine Risers and Cables, Fiscal Year 1984 Progress Report, Naval Research Laboratory, Washington, D. C., May 15, 1984.
AB File in Adobe's Portable Document Format (PDF). (8 pages) Griffin, O. M., Current-Induced Loads on Marine Structures Due to Vortex Shedding, Proceedings of the 1984 Ocean Structural Dynamics Symposium, pp. 457-471, Oregon State University, Corvallis, Oregon, September 11-13, 1984,
AC File in Adobe's Portable Document Format (PDF). (61 pages) Griffin, O. M., Rosenthal, F., The Dynamics of Slack Marine Cables, NRL Memorandum Report 5559, NRL, Washington, D. C., May 13, 1985.
AD Vandiver, J. K., Measurement of Compliant Riser Response to Sheared Currents, Proposal to Naval Research Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts, November 1986. Out of print.
AE File in Adobe's Portable Document Format (PDF). (136 pages) Vandiver, J. K., Griffin, O. M., Flow-Induced Vibration of Taut Marine Cables with Attached Masses, CR 84-004, Naval Civil Engineering Laboratory, Port Hueneme, California, November 1983.
AF File in Adobe's Portable Document Format (PDF). (40 pages) Griffin, O. M., Vortex-Induced Vibrations of Marine Cables and Structures, NRL Memorandum Report 5600, Naval Research Laboratory, Washington, D. C., June 19, 1985.
AG File in Adobe's Portable Document Format (PDF). (20 pages) Griffin, O. M., Review and Comments On: Placid Floating Production System Green Canyon, Offshore Louisiana 83.5-In. Freestanding Riser, Letter Report, Naval Research Laboratory, Washington, D. C., August 19, 1986.
AH File in Adobe's Portable Document Format (PDF). (22 pages) Griffin, O. M., Review and Comments On: Texaco Harvest Platform Damage Assessment, Letter Report, Naval Research Laboratory, Washington, D. C., January 20, 1987.
AI File in Adobe's Portable Document Format (PDF). (109 pages) Lee, J., A Performance Evaluation of Vortex-Induced Vibration Suppression Devices for Marine Application, Massachusetts Institute of Technology, Cambridge, Massachusetts, May 1987.
AJ File in Adobe's Portable Document Format (PDF). (143 pages) Chung, T. Y., Vortex-Induced Vibration of Flexible Cylinders in Sheared Flows, Doctoral Dissertation, Massachusetts Institute of Technology, Cambridge, Massachusetts, May 1987.
AK File in Adobe's Portable Document Format (PDF). (38 pages) Vandiver, J. K., The Prediction of Lockin Vibration on Flexible Cylinders in a Sheared Flow, Proceedings, Offshore Technology Conference, Paper No. 5006, Houston, Texas, May 6-9, 1985.
AL File in Adobe's Portable Document Format (PDF). (22 pages) Griffin, O. M., Review and Comments on: Texaco Harvest Platform Damage Assessment, NRL Memorandum Report 6054, Naval Research Laboratory, Washington, D. C., September 25, 1987.
AM Griffin, O. M., Review and Comments on: Texaco Harvest Platform Damage Assessment, NRL Memorandum Report 6053, Naval Research Laboratory, Washington, D. C., September 24, 1987. Out of print.
AN File in Adobe's Portable Document Format (PDF). (17 pages) Griffin, O. M., Review and Comments On: Placid Floating Production System Green Canyon, Offshore Louisiana 83.5-In. Freestanding Riser, Naval Research Laboratory, NRL Memorandum Report 6053, Washington, D. C., September 24, 1987.
AO File in Adobe's Portable Document Format (PDF). (202 pages) Iwan, W.D. , Jones, N.P., NATFREQ Usere Manual - A Fortran IV Program for Computing Natural Frequencies, Mode Shapes, and Drag Coefficients for Taut Strumming Cables with Attached Masses and Spring-Mass Combinations. Naval Civil Engineering Laboratory. June 1984.

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