Optics: measuring and testing – Material strain analysis
Reexamination Certificate
2007-10-02
2007-10-02
Tonley, Jr., Gregory J. (Department: 2877)
Optics: measuring and testing
Material strain analysis
C073S800000, C356S073100
Reexamination Certificate
active
10764634
ABSTRACT:
A method is described using optical fiber technology to measure the vibration characteristics of long slender structures subjected to dynamic disturbances imposed by water or wind generated loads. The method is based on making bending strain measurements at selected locations along the length of long slender structures such as marine risers or large ropes using fiber optics technology including Optical Time Domain Reflectometry and Bragg diffraction gratings. Engineering interpretation of information obtained from bending strains determines the vibration characteristics including frequency, amplitude, and wave length. Maximum bending strain measurements assess pending structural damage. One application is measurement of vortex induced vibrations (VIV) response of marine risers. The fiber optics based method is also applicable to the measurement of the bending characteristics of spoolable pipe using plastic optical fibers which can be interpreted to assess the pipe structural integrity and to prevent lock-up during deployment into a small diameter annulus.
REFERENCES:
patent: 5182779 (1993-01-01), D'Agostino et al.
patent: 5649035 (1997-07-01), Zimmerman et al.
patent: 6246469 (2001-06-01), Schier
patent: 6271766 (2001-08-01), Didden et al.
patent: 6401646 (2002-06-01), Masters et al.
patent: 6550342 (2003-04-01), Croteau et al.
patent: 6820489 (2004-11-01), Fernald et al.
patent: 6865194 (2005-03-01), Wright et al.
patent: 6913079 (2005-07-01), Tubel
patent: 6957576 (2005-10-01), Skinner et al.
patent: 6999641 (2006-02-01), Williams et al.
patent: 7194913 (2007-03-01), Morrison et al.
Douglas B. Johnson, Donald D. Baldwin, and K. Him Lo: “Composite Production Riser Development and Qualification Test Results,” Composites for Offshore Operations-3, S. S. Wang, J. G. Williams and K. H. Lo, Eds. University of Houston—CEAC, 2001, pp. 109-123.
J. Murali, M. M. Salama, O. Jahnsen, and T. Meland: “Composite Drilling Riser—Qualification Testing and Field Demonstration,” Composite Materials for Offshore Operations-2, S. S. Wang, J. G. Williams, and K. H. Lo, Eds., American Bureau of Shipping, 1999, pp. 115-128.
J. Kim Vandiver and O. M. Griffin: “Measurements of the Vortex Excited Strumming Vibrations of Marine Cables,” Ocean Structural Dynamics Symposium, Corvallis, Oregon, Sep. 1982.
S.S. Wang, X. Lu, and T.P. Yu: “Vortex Induced Vibrations (VIV) of Composite Production Risers,” Composites for Offshore Operations-3, S. S. Wang, J. G. Williams and K. H. Lo, Eds. University of Houston—CEAC, 2001, pp. 199-213.
J. Kim Vandiver: “Research Challenges in the Vortex-induced Vibration Prediction of Marine Risers”, Proceedings of the Offshore Technology Conference, Paper No. 8698, Houston, May 1998.
J. Kim Vandiver, K. Vikestad and C. M. Laren: “Norwegian Deepwater Riser and Mooring: Damping of Vortex-Induced Vibrations,” Proceedings of the 2000 Offshore Technology Conference, Paper No. 11998, Houston, TX, May 1-4, 2000.
M. K. Barnoski, M. D. Rourke, S. M. Jensen, and R. T. Melville: “Optical Time Domain Reflectometer,” Applied Optics, vol. 16, No. 9. Sep. 1977.
Smith, D. Barton and Williams, Jerry G.: Monitoring Axial Strain in Synthetic Fiber Mooring Ropes Using Polymeric Optical Fibers. 22nd International Conference on Offshore Mechanics and Arctic Engineering, Cancun, Mexico, Jun. 8-13, 2003.
Jerry G. Williams and D. Barton Smith: “Direct Measurement of Axial Strain in Synthetic Fiber Mooring Ropes Using Polymeric Optical Fibers,” Fourth International Conference On Composite Materials for Offshore Operations. Houston, TX, Oct. 4-6, 2005.
Jerry G. Williams and Alex Sas-Jaworsky II: “Composite Spoolable Pipe Development, Advancements, and Limitations,” Offshore Technology Conference Paper 12029. Houston, Texas, May 1-4, 2000.
Tonley, Jr. Gregory J.
Valentin, II Juan D.
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