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MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
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fatigue
SACS
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dynamics
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interactive fatigue
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Smedley and Fisher (1991)
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TIME HISTORY FATIGUE ANALYSIS IN SACS
Ali Aidibi
Hi, I would like to perform time history fatigue analysis. Is there any sample or procedure on how to perform the analysis in SACS? in case yes, please feel free to send it to my email. ( ali_aidibi_94@hotmail.com ) Many thanks in advance. Best…
4 months ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
Fatigue analysis
Shimjith Manappatty
Hi I am working on fatigue analysis of jacket structures. As per the SACS doement as below "3.5.4 Using Stresses at the Chord Face By default, member hot spot stresses at the modeled end of the brace are used for fatigue calculations. For members…
6 months ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
Pile fatigue
Shimjith Manappatty
Hello I am doing pile fatigue check based on pil.csf file (obtained from PSI analysis). Pile is defined as concentric tubular section so that grout is done in between the tubular. in FTOPT line grouted memeber option is selected and in FTOPT2 ,colum…
7 months ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
scatter diagram for fatigue analysis
Sayed Dorgham
I have scatter diagram with total number of occurrences 175320 waves. It is indicated a note that these records are " Hourly event number of occurrence - reference period: 20 years". My question, what does this note mean? should we multiply the scatter…
10 months ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
SACS Fatigue Analysis Error
Anjali Radhakrishnan
Hi Users, I am getting the following error when I run the spectral fatigue analysis file: SEASTATE FILE 1 HAS 60 LOAD CASES WHERE POSTFILE 1 HAS 1440 LOAD CASES Can anyone explain this error and what must have gone wrong?
over 1 year ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
Significance of mesh intensity and target plate length, and the relationship between the two variables
Kay Thi Kyin
Hi everyone, I would like to inquire what is the significance of mesh intensity in joint meshing. In the Utilities manual, section 3.2.3, the following highlighted statements are made (see screenshot below): Which lead to these questions: What…
over 2 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
SACS / spectral fatigue analysis
Mohamed Mahmoud
hi all , while generating the seastates (dynamic transfer function) on a cantilever inside the water it was noticed that there is bulb at the early frequency. any ideas why this happens and thanks
over 3 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
Tow Fatigue with SACS
Василий Сивовол
Hi there. I need to perform Fatigue analysis for sea transportation in order to understand this calculation I started studying this guide "Tow Fatigue with SACS". I ran into a problem, if I understood correctly this formulas => have to calculate these…
Answered
over 3 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
RAO Spectral Fatigue warning [Total Life ratio = 2.00]
Haowen Shi
Hi, When we run RAO spectral fatigue we have warning message like below. What is the cause and consequence of this warning? We didn't have this warning before when we had 16 headings (22.5 deg increment) in RAO and 16 wave scatters in ftginp. Scatters…
over 3 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
stress range and cycle counting
shawn
Dear all I'm working on a spectral analysis for a leg member. An I extract the nominal stress range and cycle counting for a member, say, by using St-cyl-command ? the reason is that, the member has weld detail joints which can't be checked within…
over 3 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
Spectral Fatigue
van bac vu
Hello everyone, Could you please clarify the significance of the resulting RMS value when we run the spectral fatigue analysis? RMS value = Sqrt(m0) or RMS = 2 Sqrt(m0) ??? Thanks!
over 4 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
Spectral Wind Fatigue
Ahmad Hafiz
Hai, I have run the analysis for Spectral wind fatigue. But there are error occur during analysis. This is my dynamic response input file Can someone help me on this.
over 4 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
Fatigue, Is the SN Curves of DNVGL-RP-C203 are equivalent to NORSOK curves
Swarup Selvaraj
Dear all, Is the SN Curves of DNVGL-RP-C203 are equivalent to NORSOK curves listed below: Thanks and Regards, SWARUP Selvaraj.
Answered
over 4 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
Center of Damage Utility Version 11.2.0.15
Swarup Selvaraj
Dear all, I am trying to use Center of Damage Utility for calculate COD wave height and time period. In the fatigue input file, I could only input 11 wave heights in SCWAV card. Can anyone explain how to input more than 11 wave heights in wave scatter…
Answered
over 4 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
ERROR - 113 NOT A RECOGNIZABLE LOAD CASE
Muhammad Ichsan
Any body can help me to solve my fatigue running? I have check it many times, but I don't know what's wrong with my SACS file
over 4 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
Request for SACS Wind turbine module example.
Young-Sik Gong
I'm Mr.Gong who works at Zentech Engineering in Seoul, South Korea. We would like to do Fatigue and Strength Check using the SACS Wind turbine module from GH-Bladed results. While browsing the example, I found an example of the following link: https…
over 5 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
SACS - Strange SCF of Tubular Connection with Ring Stiffeners
Kasiphon Kurojjanawong
Dear Sir, I am curious about SCF calculation for tubular connection with ring stiffeners. It is mentioned that Smedley and Fisher (1991) formula is applied. The R-factor calculated by using the formula mentioned above looks ok. However, the final…
Answered
over 6 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
Effective thickness of Grouted Joint in Fatigue Analysis
Pei Shing Ooi
Dear Sir, I'm running a spectral fatigue analysis for a platform with grouted legs. These are my section input for my joint cans at leg SECT LEGCAN TUB 111.765.08091.4403.810 SECT LEGCAN1 TUB 111.765.50091.4403.810 SECT LEGCAN2 TUB 111.766.00091…
Answered
over 6 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
Fatigue Analysis Force-Time history
Younghoon KIM
Hi, I try to conduct fatigue analysis by using SACS. With very useful answer in the communities, fatigue analysis was successful. However, I also want to conduct a fatigue experiment for some members based on results from fatigue analysis by SACS…
Answered
over 6 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
RE: Can we use load RAOs to generate common solution file with inertia loads for fatigue analysis. If yes, how it can be done?
Geoff McDonald
Anupam, Let's first look at the input requirements for a tow fatigue analysis: Fatigue Input File (ftginp) Common Solution File (saccsf) Seastate Input File or Tow Input File (towinp) The fatigue input file defines the fatigue cases which…
over 6 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
RE: USER DEFINED SCF FOR TUBULAR CONNECTION
Geoff McDonald
C.karthikeyan, You can specify SCF overrides in a variety of ways in your fatigue input file, the most common being the SCF line and the CONSWF for plate girders. The SCF line can be used to override SCF's for all plate girder connections whereas the…
over 6 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
RE: How to perform spectral fatigue analysis using SACS
Geoff McDonald
Stephen, You need to do a Tow Fatigue analysis. Tow Fatigue will analyze fatigue damage of a structure by generating transfer functions using motion RAO's (Velocity, Motion or Acceleration RAO's) and combining those transfer functions with the wave…
over 6 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
RE: Wave spreading application
Geoff McDonald
Sanjay, That is not how the wave spreading works in SACS. When you select the wave spreading option, SACS will take the load cases from +- 90 degrees from the fatigue load case direction and factor those load cases using cos^n(theta) so that total equivalent…
over 6 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
RE: SACS - Morison Drag Linearisation for Frequency Domain Analysis
Geoff McDonald
Kasiphon, The nonlinear drag component in spectral wave fatigue analyses is addressed by using constant steepness waves when generating transfer functions. See Section 16.7.2.3 of ISO 19902. Regards, Geoff
over 6 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
RE: SACS Broad-Band Random Process
Geoff McDonald
Kasiphon, The broad band option in SACS utilizes the equations presented in Application of computers in fatigue analysis ( Dirlik 1985). Dirlik uses an empirical formula to calculate the rainflow range density for various sea-states including double…
over 7 years ago
MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
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