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  1. TomekZeWschodu

    Calculating of structure natural frequencies

    @elreedyman Thanks for help I will review it once I get it somewhere ;) It looks that simple cases may be calculated by hand with use of formulas that can be found in: MR. Blevins's book: Formulas for natural frequency. It's quite powerfull book. I recommend :) For sure cases are simplified and...
  2. TomekZeWschodu

    Calculating of structure natural frequencies

    @helfreco - I am looking for a tool that will be able to consider both, for initial design evaluation ship structures. There are both elements constraining liquids and submerged in them. As @JStephen mentioned, there is no doubt - fully submerged elements resonance frequencies will different...
  3. TomekZeWschodu

    Calculating of structure natural frequencies

    Hello all, Do anyone know a tool, that will help with quick calculations of natural frequencies of: plates / stiffened panels / frame system? The key is that I need a tool that will include damping of the liquid that may be adjacent to the particular structural elements. thanks for help ;)...
  4. TomekZeWschodu

    Bolt analysis, applying preload

    Try in that way. Do an iterative proces on another model of your conenction. Build a model i na new file and apply a temperature load that will shrink your bolt. In interative way you will know how temperature you have to apply to get desired pretennsion and then apply it to your work-model...
  5. TomekZeWschodu

    Calculating Water Displacement

    Yes, the displacement of the ship is equal to the ship mass Naval Architect/ Structural Engineer
  6. TomekZeWschodu

    Loads, desing and analysis of wire rope drums

    HI All, I would like to do a kind of research, do you know any interesting books, literature or standards descirbing how to calculate the pressure on the wire rope drum that is a direct result of wire spooling? Do you know whether there exist a formula that will include the friction...
  7. TomekZeWschodu

    Utilization Ratio / Safety Factor / Postprocessing

    Hi All, I have done an Advanced Simulation (SOL101) in NX9 and would like to display (do the result postprocessing) a utilization factor for each element with respect to it's own Yield Strength. I have more than one material used in the analysis so simple reduction of the Stress is not a...
  8. TomekZeWschodu

    Stinger configuration

    @ lavecchiasignora BigInch is right, it's more geometry than egineering problem. Neverthelessk, you didn't specify all the circumstances of changing the stinger radius? Why do you need change the radius, what kind of stinger is it (one segment or articulated?), ... and many others. Place here...
  9. TomekZeWschodu

    S-lay pipeline installation

    Hi there, Is here anyone who knows free tool that helps to calculate pipeline tension during s-lay pipeline installation? I developed quite easy tool for that purpose but want to check the results with other solutions. Great thanks for help :) Naval Architect/ Structural Engineer
  10. TomekZeWschodu

    Padeye calculation acc to DNV 2.7-3

    @Oluk Approach you listed above should be enough to check accordance with the code requirements. To find the shear stress I would suggest you to use the smallest cut area within the padeye (including the cheek plates) or this one beeing in-line with the sling force. You can also use stress...
  11. TomekZeWschodu

    Padeye calculation acc to DNV 2.7-3

    For sure you can calculate those stress using only theoretical methods. Check In-planed strength: Calculate Von Mises components: -shear stress (simply: F/As) -bending stress calculate beased on curved beams theory -tension stress Naval Architect/ Structural Engineer
  12. TomekZeWschodu

    Test Load

    @BigInch: There is such thing as unit of Kilogram Foce (http://en.wikipedia.org/wiki/Kilogram-force) It is not commonly used but exists in physics. @hungrydinosaur: MGW [kg] = 5000 2.5 [-] = 2/5 g [m/s^2] = 9.81 Test Load = MGW*2.5*9.81 =122625 [N] =122.626 [kN] units [Test Load] = [kg] *...
  13. TomekZeWschodu

    Partial Penetration and Full Penetration Joints on Lift Padeyes

    So, the most reasonable solution for this is to use higher strength steel for padeye (to reduce a thicknes, probably cheek plates shall be provided to ensure mentioned 75% of shackle clearance), or / and (when not requirements are not fullfiled) insert an I-beam with thicked web(s) in region...
  14. TomekZeWschodu

    Padeye Design References

    Hi all, I am new on this forum. I have to design a lifting padeyes to S-lay stinger structure and I am looking for reference documents describing requiremens for padeyes. I have DNV Standard Classification Note, but I saw PAD4- application calculating required dimension of padeyes with...

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