Learning Forum

[douglas.veilleux]

I have a simple cantilevered beam example I am trying to get running which I could extrapolate to my real problem.  One end off the beam is obviously fixed.  On the opposeite end of the beam I would like to applied a PSD Displacement.  However, in workbench I've been unssucesfull in making this happen.  My latest attempt has been to try and use an APDL command snippet to grab an end node (free end) and apply the PSD Displacement to that node.

Has anyone done this type of problem?  ANy suggestions?  I'm currently not having luck getting this to work.

[harshvardhan.negi]

Hi,
There is a thread with similar discussion:
PSD (random vibration) and Acceleration on a body (harmonic response) (ansys.com)

I hope this helps.
Regards,
Harshvardhan

[davids0miller1]

It sounds like you're on the right track trying to apply a PSD displacement at the free end of your cantilevered beam in ANSYS Workbench. Here are a few suggestions that might help you troubleshoot:

1. Check Node Selection: Ensure you’re correctly identifying the free end node. You can verify the node number in the graphical interface or by checking the element connectivity.

2. APDL Commands: When using APDL commands, ensure that you’re correctly referencing the node with the command N, followed by the node number, to apply the displacement. For example:

   apdl

   Copy code

   N, , 0, 0, 0 ! If needed to ensure proper selection D, , UY, PSD_displacement

3. Inputting PSD Data: Make sure that the PSD data you’re trying to apply is formatted correctly. It’s often necessary to define a time history function that represents your PSD.

4. Solver Settings: Double-check your analysis settings, as some settings might not support the displacement method you're trying to apply.

5. Reference Documentation: Consult the ANSYS documentation or forums for specific commands and examples related to applying PSD displacements. The ANSYS user community is also a great resource for similar cases.

If you're still having trouble, consider sharing your APDL command snippet or any error messages you’re encountering for more targeted assistance!