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Found 8 results

  1. Hello, I would like to know how to set up PSD nodal force output from RANDOM Response analysis because I have problems with this. I find out it should be possible trough XYPEAK / XYPLOT / XYPUNCH I/O Options and Subcase Information Entry. However, when I use CASE_UNSUPPORTED_CARDS with option e.g. "XYPLOT,FORCE,PSDF / 184934(T2)" where 184934 is ID of grid point in the model, I get following error in .out file: *** See next message about line 13 from file: D:/subory/PHP/Priprava_Modelu_Sendvica/Modalna_analyza/pokus6/Random/test/model_12_5_20__10_26.fem "XYPLOT,FORCE,PSDF / 184934(T2)" *** ERROR # 1651 *** in the input data: Syntax error in XYPLOT/XYPRINT/... card - last item read: "T2". I have also tried use command as follows: "XYPLOT,FORCE,PSDF / 184934(2)" which leaded to error: *** ERROR # 6034 *** Nonexistent element 184934 referenced by XYPUNCH/XYPLOT/XYPEAK request. ************************************************************************ A fatal error has been detected during input processing: *** ERROR # 6034 *** Nonexistent element 184934 referenced by XYPUNCH/XYPLOT/XYPEAK request. which is weird because I would like to see grid/nodal output (no element output). I have also tried use of Tools->Process manager->Freq Resp Process->Random PSD frequency response. Here I don't need to enter the command directly, but trough GUI of process manager which reduces possible mistakes of mine. In the manager I used besides other sections also section "Define Responses"->"Select Nodal PSD Response" where what I need should be possible in my opinion. I used "Add DOFs" where I choose "Response Type: FORCE" and I have selected mentioned node then I choose Y direction and set "Assign Format" to XYPLOT However, eventualy I get same kind of CARD (CASE_UNSUPPORTED) with absolutely same command in it and I get also same error. I have attached model .fem file if it helps. So, I would apreciate if someone can help me. Thank you. model_12_5_20__10_26.fem
  2. Hi, I am currently performing random vibrartion analysis, where I have sweep up PSD data for muffler. I have some query mention below: 1)From testing, I got PSD data (G^2/Hz vs Freq) . Do I have to change it into { (mm/sec2)^2 vs freq}. 2)when I am giving the input in (G^2/Hz vs Freq) and FRF excitation as 1 , then PSD stress is very very less e-7. 3)Plz suggest the appropriate methodology step by step for providing - input (in which form) and post-processing method to interpret results (which stress is useful). Thanks in Advance
  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. How to get RMS stress from random response analysis in optistruct? pls share the procedure for that.
  5. Hello, Can anyone please let me know how to get/ request rms stress in HM 11, Optistruct Solver? Thank you.
  6. Hi, What is the significance or reason of plotting Gin (PSD) curve and Gout ( Response) curve in same plot in Random response analysis ? Is there any theory behinds?
  7. Hi, What is the significance or reason of plotting Gin (PSD) curve and Gout ( Response) curve in same plot in Random response analysis ? Is there any theory behinds?
  8. Hi all, I'm trying to learn about the random vibration analysis. From what I know, RVA uses the modal superposition method as its basis. Since it uses the modal superposition, it implies that random vibration analysis is a linear dynamic analysis. Lets say if you have a model with two or more parts, and you define some connection (spot-welds or elastic beams Rbe3) for them. The connection usually will introduce nonlinearity into the system. So then, in the end, I'm guessing the analysis will output nonlinear solutions. The thing that I have trouble understanding is that how is it possible to start out with a linear analysis and end up with a nonlinear solutions? Doesn't the nonlinear random vibration analysis violate the superposition method that it uses as the basis? Any comments or tips would greatly appreciated. Regards,
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