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MAXSURF | MOSES | SACS | OpenWindPower
MAXSURF | MOSES | SACS | OpenWindPower Forum
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    • Real and Imaginary Load Cases in SACS (Fatigue analysis)

      Василий Сивовол
      Василий Сивовол
      Hi There. I'll be grateful If anybody explain me following problem: I came across the problem while I was studying this topic https://communities.bentley.com/products/offshore/w/wiki/39310/tow-fatigue-with-sacs I understand that we use RAO to derive…
      • over 3 years ago
      • MAXSURF | MOSES | SACS | OpenWindPower
      • MAXSURF | MOSES | SACS | OpenWindPower Forum
    • Tow Fatigue with SACS

      Василий Сивовол
      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
    • Regarding selfweight doubled in Sacs Tow file while using RBMASS calculation to find Mass moment of inertia of a system

      Balaji Prasath Punniyamoorthy
      Balaji Prasath Punniyamoorthy
      Hi I tried to find Mass moment of inertia of my structure using TOW-RBMASS command. ALL LOADS i specified in my main *.INP file and when try to check in the Tow output i find that self weight is added or duplicated again in the RBMASS case alone. switching…
      • Answered
      • over 4 years ago
      • MAXSURF | MOSES | SACS | OpenWindPower
      • MAXSURF | MOSES | SACS | OpenWindPower Forum
    • Help with SACS Transportation Inertia Load analysis

      Muhammad
      Muhammad
      Dear Colleagues, Hi I am new with SACS, and am working on inertia loading generation with SACS tow module. I have some confusion with the notation system that SACS tow adopt. Let's say we have conventional seakeeping coordinate system (X-surge, Y…
      • over 5 years ago
      • MAXSURF | MOSES | SACS | OpenWindPower
      • MAXSURF | MOSES | SACS | OpenWindPower Forum
    • RE: inertial forces for bodies underwater

      Geoff McDonald
      Geoff McDonald
      Samsul, The only way to generate added mass and entrapped mass in SACS is through the Dynpac analysis. You can specify the added mass coefficient and flooding options on the DYNOPT line of the Dynpac input file. The added mass and entrapped mass will…
      • over 6 years ago
      • MAXSURF | MOSES | SACS | OpenWindPower
      • MAXSURF | MOSES | SACS | OpenWindPower Forum
    • RE: Dynamic Analysis in SACS

      Geoff McDonald
      Geoff McDonald
      Camille, You can use RAO's in conjunction with a wave height and period to generate a resulting inertial load on the structure which can then be solved to check the member stresses. However, SACS does not perform a dynamic analysis for this response…
      • 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
      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: Transportation analysis including weights

      Geoff McDonald
      Geoff McDonald
      Michael, The above tow input file should be fine as long as you have defined your model input file correctly. It is difficult to say what may be wrong without looking at the model file and run file associated with this analysis, but there are a few…
      • over 6 years ago
      • MAXSURF | MOSES | SACS | OpenWindPower
      • MAXSURF | MOSES | SACS | OpenWindPower Forum
    • RE: How to perform spectral fatigue analysis using SACS

      Geoff McDonald
      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: Towing analysis of a slender Pile in a Jack up barge

      Geoff McDonald
      Geoff McDonald
      I don't think I understand what you are trying to analyze. It sounds like you are asking if you can perform an analysis of the pile using inertial loading from transportation. This can be accomplished using the tow analysis where you can model the pile…
      • over 6 years ago
      • MAXSURF | MOSES | SACS | OpenWindPower
      • MAXSURF | MOSES | SACS | OpenWindPower Forum
    • RE: Transportation analysis by using SACS with G-forces.

      Saravanan Ravichandran
      Saravanan Ravichandran
      Derek, Please tell us what do you mean by this line But someone told me you have to input G-force and angular acceleration in Max acceleration together? However we do have options to input both G-force and acceleration in towinp file.
      • over 7 years ago
      • MAXSURF | MOSES | SACS | OpenWindPower
      • MAXSURF | MOSES | SACS | OpenWindPower Forum
    • RE: SACS - Frequency Domain Transportation

      Geoff McDonald
      Geoff McDonald
      Kasiphon, Currently we only support frequency domain analysis in tow fatigue. I have been talking with our developers about implementing the maximum probable stress calculations based upon the stress RAO's as a possible enhancement for a future release…
      • over 7 years ago
      • MAXSURF | MOSES | SACS | OpenWindPower
      • MAXSURF | MOSES | SACS | OpenWindPower Forum
    • RE: A couple of questions

      Geoff McDonald
      Geoff McDonald
      In the case of tow fatigue, the naval architect would typically provide the structural engineer with response amplitude operators (RAO's) which are calculated using their hydrodynamic analysis in MOSES. The structural engineer would then calculate the…
      • over 7 years ago
      • MAXSURF | MOSES | SACS | OpenWindPower
      • MAXSURF | MOSES | SACS | OpenWindPower Forum
    • RE: A couple of questions

      Geoff McDonald
      Geoff McDonald
      1. The center of roll depends on the properties of the vessel as well as the cargo. You will need to perform a hydrodynamic analysis in order to find the center of roll. Typically you will get this information from your Naval Architect. MOSES can be used…
      • over 7 years ago
      • MAXSURF | MOSES | SACS | OpenWindPower
      • MAXSURF | MOSES | SACS | OpenWindPower Forum
    • RE: Structural analysis of a free floating jacket

      Geoff McDonald
      Geoff McDonald
      Cris, If you already have the motion data, you can perform a tow analysis to convert the motion data into inertial loading on the topsides structure. You can enter your motions as motion data, RAO's or accelerations. You may refer to the Tow manual…
      • over 7 years ago
      • MAXSURF | MOSES | SACS | OpenWindPower
      • MAXSURF | MOSES | SACS | OpenWindPower Forum
    • RE: SACS Motion Analysis for Tow

      Geoff McDonald
      Geoff McDonald
      Siddhant, There are two options that you have to generate static load cases for Tow analyses: You should be able select No when exporting to SACS TOW file to export acceleration load cases (See Below). You will have to manually define the load cases…
      • over 7 years ago
      • MAXSURF | MOSES | SACS | OpenWindPower
      • MAXSURF | MOSES | SACS | OpenWindPower Forum
    • RE: SACS Motion Analysis for Tow

      Geoff McDonald
      Geoff McDonald
      There are two ways that you can run Motions analysis in SACS. You can either use the SACS Motions program or the SACS Motions/Stability module. Since you have created the hull in maxsurf, I would recommend using the SACS Motions program to run the motions…
      • over 7 years ago
      • MAXSURF | MOSES | SACS | OpenWindPower
      • MAXSURF | MOSES | SACS | OpenWindPower Forum
    • SACS Motion Analysis for Tow

      Sid
      Sid
      Hello! I am analyzing a Jack Up Rig with a single column for wet tow. During wet tow, the jack-up will be floating on its hull and the column will be above water. The procedure I have adopted is as follows: 1. Perform a wave dynamic analysis in SACS…
      • Answered
      • over 7 years ago
      • MAXSURF | MOSES | SACS | OpenWindPower
      • MAXSURF | MOSES | SACS | OpenWindPower Forum
    • SACS RAO - strange output and input

      Kasiphon Kurojjanawong
      Kasiphon Kurojjanawong
      I am curious about RAO command in SACS Tow input file. See attached picture, I put RAO = 1g (m/s^2 /m) which is already base on unit wave amplitude (Wave height / 2). Unit wave amplitude is 1m. (Wave Height = 2*1m = 2m) Then, SACS should give…
      • Answered
      • over 7 years ago
      • MAXSURF | MOSES | SACS | OpenWindPower
      • MAXSURF | MOSES | SACS | OpenWindPower Forum
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