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Recent content by petb

  1. petb

    how to write a parameter in APDL code inside workbench file ?

    Note that this only works for linear 1st order elements. otherwise you will apply inconsistent nodal loads using this approach.
  2. petb

    Deletion of 1.4532 from En 10088-2

    Would the properties from the old standard suffice? What properties are you looking for? /PB
  3. petb

    Oxygen level sensor in mixing chamber/tank

    Morten, Thank you for the information. The planned position for us is right after a mixing chamber where we mix a drying media with some inert gas, not very susceptible to condensation in this position so I think this will work well. Thank you for the recommendation. BR PB
  4. petb

    Reduce Stiffness

    @GregLocock, very good idea. I worked a whole summer testing glass fiber beams stiffness and trying to replicate in a Fe-model. It was until the experienced lab technician telling me to do exactly this and "subtract" the rig compliance that I could match my FE-simulations to the test results...
  5. petb

    Oxygen level sensor in mixing chamber/tank

    Thank you pierreick!
  6. petb

    Oxygen level sensor in mixing chamber/tank

    EdStainless, thanks I will look into the fuel cell variant as well. georgeverghese, for a stable process this would be sufficient, but being a pilot plant with a lot of variations a sensor is needed.
  7. petb

    Oxygen level sensor in mixing chamber/tank

    Sorry for not being more precise, I do know that I need an oxygen sensor. What I was looking for was advice on what type would be sufficient/reasonable to use in this application. So more of an recommendation if I should go with amperometric sensor or a TDL-sensor.
  8. petb

    Oxygen level sensor in mixing chamber/tank

    We are mixing air, at room temperature and N2 in a mixing chamber/tank. We want to make sure that we are getting the oxygen under a certain limit before allowing it to enter the process. Do you have any recommendations on a sensor/type of sensor that can achieve this? This gas mixture will then...
  9. petb

    Vibrationdata Matlab Stand-alone Executable GUI Package

    Thank you for making this available. This is brilliant.
  10. petb

    NFORCE vs FSUM

    They should indeed be the same, when I run your code I get the same output from both FSUM and NFORCE. The code below shows a typical usage of fsum and nforce, and they behave as they should: /prep7 k, k,2,1 k,3,2 l,1,2 l,2,3 et,1,189 lesize,all,,,4 lmesh,all DK,1,UY, ...
  11. petb

    NFORCE vs FSUM

    Ok, Can you share a small APDL-snippet that reproduces this behaviour?
  12. petb

    NFORCE vs FSUM

    FSUM Sums and prints, in each component direction for the total selected node set, the nodal force and moment contributions of the selected elements attached to the node set. NFORCE Sums and prints, in each component direction for each selected node, the nodal force and moment contributions of...
  13. petb

    Frequency in a blender signal

    Blade pass frequency (BPF) or 2 x BPF of the mixer impeller maybe? How many impeller blades? /PB
  14. petb

    Solidworks FEA

    kaffy, What's the objective of your calculation? To design/check the anchor bolts? I'm all for the use of FEA, but for anchor design it is often not necessary. Anchor bolt suppliers often provide excellent formulas or software to conservatively design fasteners for the most common type of...
  15. petb

    ISO 14694 vibration limits

    No. Flexible: First natural frequency of the system is well below the operating speed of the fan. Rigid: First natural frequency of the system is well above the operating speed of the fan. The rigidity of a foundation is a relative quantity. It must be considered in conjunction with the...
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