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Project Number 2
Date of Summary December 31, 1983
Subject Dynamic Response of Offshore Structures
Performing Activity Massachusetts Institute of Technology
Principal Investigator Dr. J. Kim Vandiver
Contracting Agency Minerals Management Service
Completion Complete
Description Fluid-structures interaction research to predict fatigue life of offshore platforms. Determine structural response properties (such as natural frequencies, damping and modal shapes) from field data. Predict the dynamic response of structures to wave and ground excitation. Project No. 36 is an adjunct project to this investigation.
Progress Complete. Two high resolution spectral estimators were applied to assess the amount of structural damping: maximum likelihood spectral analysis (MLM) (to locate frequency bands of energy) and maximum entropy analysis (MEM) (to assess energy levels in the various bands). Results indicate lower damping than commonly believed. The MEM damping estimators were compared to results measured by Shell and agreed to within confidence bounds. Multiple channel MEM techniques were investigated to identify modal shapes. The research applied unique relationships between linear wave forces and wave radiation damping and revealed additional useful relationships between nonlinear drag forces and viscous hydrodynamic damping.
Reports
AA (588 KB) File in Adobe's Portable Document Format (PDF) . Vandiver, J. K., The Effect of Liquid Storage Tanks on the Dynamic Response of Offshore Platforms, Proceedings: 1978 Offshore Technology Conference, Volume I, pp. 3162, May 1978.
AB (518 KB) File in Adobe's Portable Document Format (PDF) . Vandiver, J. K., Campbell, R. B., Prediction of the Damping Controlled Response of Offshore Structures to Random Excitation,11th Annual OTC, Houston, TX,  April 1979.
AC (Out of print) Vandiver, J. K., Campbell, R. B., Prediction of the Damping Controlled Response of Offshore Structures to Random Excitation, Offshore Technology Conference, Proceedings Paper No. 3515, pp. 1355-1364, Houston, Texas, May 1979.
AD (410 KB) File in Adobe's Portable Document Format (PDF) . Campbell, R. B., Vandiver, J. K., The Estimation of Natural Frequencies and Damping Ratios of Offshore Structures, Proceedings 1980, Offshore Technology Conference, Paper No. 3861, May 1980.
AE (229 KB) File in Adobe's Portable Document Format (PDF) . Vandiver, J. K., The Prediction and Measurement of the Dynamic Properties of Offshore Structures, Annual Technical Project Report, R&D Program for OCS Oil and Gas Operations, September 1980.
AF (553 KB) File in Adobe's Portable Document Format (PDF) . Vandiver, J. K., Prediction of the Damping Controlled Response of Offshore Structures to Random Wave Excitation, Society of Petroleum Engineers Journal, February 1980.
AG (1.992 KB) File in Adobe's Portable Document Format (PDF) . Dunwoody, A. B., The Role of Separated Flow in the Prediction of the Dynamic Response of Offshore Structures to Random Waves, Ph.D. Thesis, Massachusetts Institute of Technology, Cambridge, Massachusetts, May 19, 1980.
AH (470 KB) File in Adobe's Portable Document Format (PDF) . Vandiver, J. K., Dunwoody, A. B., Campbell, R. B., A Mathematical Basis for the Random Decrement Vibration Signature Analysis Technique, R&D Program for OCS Oil and Gas Operations, February 1981.
AI (Out of print) Manuel F., Detection of Structural Damage in Offshore Structures by Vibration Monitoring of Their Elements, Master of Science in Ocean Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, 1981.
AJ (928 KB) File in Adobe's Portable Document Format (PDF) . Vandiver, J. K., The Significance of Dynamic Response in the Estimation of Fatigue Life, Report to the Norges Tekniske Hogskole, Trondheim, Norway, October 1980.
AK (421 KB) File in Adobe's Portable Document Format (PDF) . Cook, M. F., Vandiver, J. K., Measured and Predicted Dynamic Response of a Single Pile Platform to Random Wave Excitation, Proceedings of the 1982 Offshore Technology Conference, Paper No. 4285, Houston, Texas, May 1982.
AL (246 KB) File in Adobe's Portable Document Format (PDF) . Vandiver, J. K., The Significance of Dynamic Response in the Estimation of Fatigue Life, Paper 81-WA-OCE-13, ASME Winter Annual Meeting, Washington, D.C., December, 1982.
AM (417 KB) File in Adobe's Portable Document Format (PDF) . Vandiver, J. K., The Sensitivity of Fatigue Life Estimates to Variations in Structural Natural Periods, Modal Damping Ratios, and Directional Spreading of the Seas, Proceedings of the Third International Conference on the Behavior of Offshore Structures, Massachusetts Institute of Technology, Cambridge, MA, 1982.
AN (414 KB) File in Adobe's Portable Document Format (PDF) . Vandiver, J. K., Briggs, M. J., Multichannel Maximum Entropy Method or Spectral Analysis Applied to Offshore Platforms, Proceedings, 1982 Offshore Technology Conference, OTC Paper No. 4286, Houston, Texas, May 1982.
AO (2.348 KB) File in Adobe's Portable Document Format (PDF) . Vandiver, J. K., Dynamic Response of Offshore Structures, Annual Technical Report, USGS Contract No. 24-08-0001-20605, Massachusetts Institute of Technology, Cambridge, Massachusetts, August 31, 1982.
AP (2.024 KB) File in Adobe's Portable Document Format (PDF) . Samii, K., Auto-Regressive Moving Average Simulations of Random Wave Forces on Offshore Structures, Ph.D. Dissertation, Massachusetts Institute of Technology, Department of Ocean Engineering, Cambridge, Massachusetts, August 1983.
AQ (804 KB) File in Adobe's Portable Document Format (PDF) . Ghosh, P. K., The Prediction of Hydrodynamic Viscous Damping of Offshore Structures in Waves and Current by the Stochastic Linearization Method, M.S. Thesis, Massachusetts Institute of Technology, Department of Ocean Engineering, Cambridge, Massachusetts, May 1983.
AR (325 KB) File in Adobe's Portable Document Format (PDF) . Vandiver, J. K., Dynamic Response of Offshore Structures, Annual Technical Report, USGS Contract No. 14-08-0001, 20605, Massachusetts Institute of Technology, Cambridge, Massachusetts, November 1, 1983.
 

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