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Found 6 results

  1. How to resolve this error.. I am using HyperMesh/Optistruct? Messages for the job: *** ERROR # 2813 *** TABRND1 referenced by RANDPS data returned a negative value for each frequency. This is probably due to extrapolation of the TABRND1 data. No results can be calculated. *** PROGRAM STOPPED: FATAL ERROR(s) ENCOUNTERED.
  2. Hi all! I performed a random response in Nastran. I would like to plot the apparent frequency for each element of my model. Is Hyperview capable of this? Besides, I was not able to load random analysis results with multiple subcase in the nastran input file. Is this a limitation of Hyperview?
  3. How to get RMS values of output plot in random response analysis in optistruct? Pls suggest suitable control card to get rms value
  4. Hi sir, Can anyone tell me how to convert the PSD (m/s2)2/Hz data in to the Acceleration (m/s2)
  5. In a random frequency response analysis, the input is in PSD in (m/s2)2/Hz and RMS value in m/s2. I need to perform a random vibration analysis in Hypermesh using Optistruct. How we should input PSD and RMS values. What load collectors/cards should we use?. Next question is regarding units, if Im using mm,Tonne,Newton units. Then how should i convert the PSD data in (m/s2)2/Hz to compatible units.
  6. Hi, I am running a random response analysis and I tried to request the SPC forces by selecting it in the random subcase output section like I did it for a simple frequency response analysis . My question is now how to get SPC forces outputted for a random response analysis in optistruct. Thanks. Jonas
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