EXTREME RESPONSE ESTIMATION FOR MARINE RISERS

A new strategy for estimation of extreme response in tensioned marine risers is proposed. The strategy is outlined and discussed in relation to more conventional methods such as regular wave, design storm and direct use of long-term response statistics. As the riser is loaded by non-linear drag forces from ocean waves, linear response methods can in general not be applied. Hence, the response will be of non-Gaussian nature and the straight-forward use of Rayleigh distribution will not give a correct result. The proposed method is based on a combination of long-term wave statistics, use of frequency domain analyses and time domain simulations. The procedure is applied in a case study and results are compared to results from other strategies. The conclusion is that the new approach seems promising but further work on statistical uncertainty is needed.

• Supplemental Notes:
  • Proc 9th Intl Conference Offshore Mechanics & Arctic Engng, 1990, v 1, pt B, p 361 [9 p, 13 ref, 10 tab, 10 fig]
• Authors:
  • Larsen, C M
  • Passano, E
• Publication Date: 1990

Language

• English

Subject/Index Terms

• TRT Terms: Drag; Dynamic loads; Force; Waves
• Uncontrolled Terms: Dynamic response; Wave forces
• Old TRIS Terms: Risers
• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00699349
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM