Learning Forum

[majiaobin]

This question follows the previous one "Questions regarding Boundary condition setting and Random Vibration Analysis (pressure excitation)". The blade shroud and hub face are fixed boundaries, and random loads with acceleration PSD of airflow on the pressure surface and suction surface.
Pressure PSD loading and solving was previously resolved by defining p_face and APDL commands.
Now my question is how to load the acceleration PSD? Can I still use the previous command stream but add a different PSD type?

[Ashish Khemka]

Please see if the following link helps:

Performing Random Vibration Analysis Using Ansys Mechanical - YouTube
Regards Ashish Khemka

[aeslaminejad]

could you please show how to excite the structure with Pressure PSD on the surface. 

also, could you please share the Command codes in Modal and Random vibration. ?

[Erik Kostson]

Hi

PLease in the future open up a new post, and do not reopen old ones.

See the help manual for a pressure psd analysis.

It is VM203 in the apdl verification manual.

We can use these commands in the command snippets as shown above in the image of the original post.

All the best

Erik

 

[aeslaminejad]

Thank you Erik,

Sorry for that, I didn't know that and I will open new discussion it for future questions. 

for this problem, I exactly needs the command that goes to Modal and then goes to Random vibration. I already checked the help, but I am not sure which command should be used for pressure PSD load on the surfaces in Workbench. 

I dont know how to find the VM203 in the apdl verification manual.

 

Thank you!

Ash