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Recent content by izax1

  1. izax1

    Tria/Tetra vs Quad/Hex

    As a young engineer(some years ago now) I was told by my colleagues not to use Tria or Tetra elements, because they were not accurate enough. But today automated meshing is mostly with Trias and Tetras. Is it that we didn't knew better back then (I started with FE in the late 1980's and early...
  2. izax1

    Windmill Blade twist

    Hi all We are in the process of developing a novel Windmill blade design. We have most of the design criteria defined but one thing is bit unclear: Where is the rotation center for blade twast? And is it the same rotation center along the blade length?
  3. izax1

    Vibration of PCB

    drawoh. Well you don't have a board of known stiffness. All the components will alter the PCB stiffness.
  4. izax1

    Vibration of PCB

    IRstuff, thanks for your feedback. No, not at all. But I'm wondering: how can I get the correct stiffness of the components without coming down to the nitty gritty details of each component with soldering and cabling. Do you have any good suggestions on how to do this? Or anyone else on the...
  5. izax1

    Vibration of PCB

    Yes, that's the thing. This is not an accurate model, because I don't have the stiffness of the components.
  6. izax1

    Vibration of PCB

    Hi there I've been searching and wondering how to correctly FE-model a populated PCB with components. I get excellent input from Steinberg book, but how to model thia with FE is still a mystery. The Componens will add both mass and stiffness to the PCB, and to model this corectly without using...
  7. izax1

    MIL-S-901

    Thank you. 3DDave
  8. izax1

    MIL-S-901

    Hi Does anyone have experience with shock loads from MIL-S-901 testing? We have been asked to do an analysis of ahip board equipmnet mounted in a navy vessel. What g-levels do we apply?? Thanks for any help. Rgds Bernt
  9. izax1

    Optistruct error

    Hi I just wonder what the error #1466 means: "BEGIN BULK" encountered while reading continuation for control card. My Job stops, and I am not able to get results. Any help is appreciated:-)
  10. izax1

    Shock mount selection procedure

    Is it one single shock mount you are applying? In order for you to select the correct shock mount, you need to know the dynamic behavior of your electronic component. And compare that to the shock. Shock duration (gives you the frequency), shock wave form etc. Generally, you will need to...
  11. izax1

    All Simulation Packages use FEM

    Intersting discuasionQ! But how do we define "accurate"? I bet that no matter how accurate you set up your FEM model, it will never copy the reality. And reality is also relative depending om how well you manufacture the part and how accurate the system is assembled. After all, FEM is only a...
  12. izax1

    Why is 11ms on shock loads "Standar

    Well. Maybe it is just me being used to working with defence materials. Both Def-Stan and MIL-STD-810 operates with a shock duration of 11ms.
  13. izax1

    Why is 11ms on shock loads "Standar

    Why is 11ms on shock loads "Standard"?
  14. izax1

    Helicopter vibrations

    Yes, I have to switch back to the original. But for us, Airbus is several links away back from where we are. This is a MEDEVAC helicopter, and our immediate contact is the helicopter operators. But we will get through the jungle in the end. Thanks for any input.
  15. izax1

    Helicopter vibrations

    Yes, now I looked at MIL-STD-810G. And G gave some good info. Previously I used F version, and that was more confusing. Thank you.
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