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Recent content by Dan90

  1. Dan90

    Overall Sound Pressure Level calculation

    Hi Greg, thank you very much for the reply. I think you are right on the use of the second formula only when the spectrum is expressed in bands. In my opinion this is due to the fact that when I convert a PSD from narrow band to, for example, 1/3 octave bands, the values I get for each band...
  2. Dan90

    Overall Sound Pressure Level calculation

    Hello to everybody, I am a bit confused about the calculation of an OSPL of a pressure spectrum. From what I learned, I know that the OSPL should be a number describing how much energy is related to the spectrum under consideration. Nothing special so far, but I read about two formulas for its...
  3. Dan90

    Problem in acoustic modes analysis

    Ok guys, to whom it may concern I solve the problem. The issue lay in the PSOLID property format which did not respect what is written in the NX Nastran QRG at page 2220 (Bulk data entries -PSOLID).
  4. Dan90

    Problem in acoustic modes analysis

    Hello to everyone, I am having problems with a eigenvalues analysis. In particular I need to extract the acoustic modes from my model. I have created a fluid material (mat10), specifying all the properties needed, but when I run the analysis the following fatal error appears: *** USER FATAL...
  5. Dan90

    Volume body from solid structure

    Hi guys, finally I solved my problem extracting each single volume from each part and then merging all the volumes together. Thank you very much for the help!
  6. Dan90

    Volume body from solid structure

    Unfortunately, I did not solve my problem yet. I will let you know if I solve, but, if you have some other tips, please share them with me.
  7. Dan90

    Volume body from solid structure

    Dear John, thank you for the awesome video. Anyway I did not solve my problem due to an error message which appears when I try to delete the faces. I have attached a video in which I try to execute the same commands as you did with your part. What do you think is wrong with my...
  8. Dan90

    Volume body from solid structure

    No, I need to create the airvolume in the image as a body..
  9. Dan90

    Volume body from solid structure

    In the attached image I use the space finder as suggested by Toost and the filled volume is exactly what I need as a body..http://files.engineering.com/getfile.aspx?folder=3e625817-3be4-41a1-a088-092a094d7306&file=filling.png
  10. Dan90

    Volume body from solid structure

    Thank you guys for the very quick replies. Excuse me, but maybe I was not able to well explain my real intent. I do not need to just measure the empty volume inside the airbox, but I need to "create" such a volume. First, I brutally closed the structure by means of the extrusions. Then I...
  11. Dan90

    Volume body from solid structure

    Hi guys, My part consists of an airbox for automotive applications and I need to get the air volume inside it which, of course, is not present as body. Does anyone know a simple way to obtain such an air volume as a body (starting from the airbox)? I have attached an image of the airbox...
  12. Dan90

    Import geometry problem

    But, what does it mean that surface 1138 has no faces? With Femap 11.0.1 I can't simply delete it. Does it mean I will not be able to mesh the whole geometry?
  13. Dan90

    Import geometry problem

    Ok, thank you very much! Here below you can download the geometry. http://files.engineering.com/getfile.aspx?folder=ccde27e9-2f69-4c11-8e1b-afeae5128f93&file=Geometry.prt
  14. Dan90

    Import geometry problem

    Dear blas, as always you are right! Yesterday I found out that when importing a .stp file FEMAP converts it into parasolid. So I tried to export the solid object from NX9 as parasolid file and it seems to be the correct choice. However, after that Femap performs the import operation, a warning...
  15. Dan90

    Problem in exporting a .stp solid

    ok, I solved the problem. The file was correctly exported by NX9 and the problem was, as suggested by robnewcomb, in the import settings for step file. Therefore I tried parasolid and it seems to be the right way. Thank you all!
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