Definition(s)
Response Amplitude Operator
Ratio of a vessel’s motion to the wave amplitude causing that motion and presented over a wide range of wave periods
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards
Response Amplitude Operator (RAO)
For regular waves, it is the ratio of a vessel’s motion to the wave amplitude causing that motion and presented over a range of wave periods.
Source: API RP 16Q, Recommended Practice for Design, Selection, Operation and Maintenance of Marine Drilling Riser Systems, First Edition, November 1993 (Reaffirmed August 2001). Global Standards
Response Amplitude Operator (RAO)
Relationship between wave surface elevation amplitude at a reference location and the vessel response amplitude, and the phase lag between the two.
Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards
Response Amplitude Operator (RAO)
Relationship between wave surface elevation amplitude and the vessel response amplitude, and the phase lag between the two.
Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards
Response Amplitude Operator (Regular Waves)
Ratio of a vessel’s motion to the wave amplitude causing that motion and presented over a range of wave periods.
Source: ISO 13624-1:2009, Petroleum and natural gas industries – Drilling and production equipment – Part 1:Design and operation of marine drilling riser equipment. Global Standards