Posted by: Ravi Babu
Load Case for Fatigue Analysis of FPSO Topsides Piping - 05/29/07 10:29 PM
How to generate the load cases for Fatigue Analysis of FPSO topsides piping especially that due to wave induced loads & vibration of rotating machinery.
Regards
Ravi
Posted by: Ravi Babu
Re: Load Case for Fatigue Analysis of FPSO Topsides Piping - 05/30/07 06:05 AM
Dave / Richard
Please let me know some example load cases for the same.
Regards
Ravi babu
Posted by: John C. Luf
Re: Load Case for Fatigue Analysis of FPSO Topsides Piping - 05/30/07 08:15 AM
This is a code consideration and not a software issue!
Did you try searching on FPSO????
Posted by: Ravi Babu
Re: Load Case for Fatigue Analysis of FPSO Topsides Piping - 05/30/07 10:49 PM
Hi John
i tried searching in Google for FPSO . Search is not revealing me exactly the information what i want. I need to be more specific while searching. I am intrested at present only in the Load cases.
Regards
Ravi babu
Posted by: Richard Ay
Re: Load Case for Fatigue Analysis of FPSO Topsides Piping - 05/31/07 07:07 AM
In the
December 1998 issue of COADE's
Mechanical Engineering News, there is an article starting on page 18 that discusses Fatigue Analysis and how to set the load cases in c2. Pay particular attention to the "load state" diagram on page 20, and how you go from the diagram to the load cases used for analysis.
Posted by: Ravi Babu
Re: Load Case for Fatigue Analysis of FPSO Topsides Piping - 05/31/07 10:01 PM
Richard
The one which you have shown the link , i have already gone through many times. The load cases mentioned there is due to pressure , temperature cycle induced fatigue.what iam intrested here is to generate the load case when the FPSO is subjected to Inertial acceleration & Sagging , Hogging Effect. Both these efects are cyclic and i need to generate the load cases for the above two effects.
Also let me know how to consider the load cycles for Sagging & Hogging of FPSO.For Inertial acceleration i know.
We need to consider the effect on Topsides Piping.
Regards
Ravi Babu
Posted by: Richard Ay
Re: Load Case for Fatigue Analysis of FPSO Topsides Piping - 05/31/07 10:33 PM
If you understand the above referenced article, then you understand the principle, which can be applied to any set of varying loading conditions. Your accelerations can be simulated as "uniform loads" (with the units of G's), and then you can take the difference between these cases applied a specified number of cycles.
Posted by: John C. Luf
Re: Load Case for Fatigue Analysis of FPSO Topsides Piping - 06/01/07 08:16 AM
Posted by: Ravi Babu
Re: Load Case for Fatigue Analysis of FPSO Topsides Piping - 06/03/07 02:48 AM
Thanks John
Could you please throw some light on Vibration Induced Fatigue as well.
regards
Ravi Babu