Frequency Response Function (FRF) for rotation in ANSYS Workbench

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  • Last Post 13 April 2020
azolo posted this 31 March 2020

Hello everyone,

For a point on my model I need the Frequency Response Function (FRF) of the Z-rotation after applied torque. In ANSYS Mechanical APDL there is the option but in ANSYS Workbench I don't find it. Is there a way to do it also in ANSYS Workbench?

I hope someone can help me out.

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azolo posted this 11 April 2020

How can I get the rotational displacement in Z (rz) for a point in ANSYS Workbench?

peteroznewman posted this 11 April 2020

azolo posted this 13 April 2020

I have now found a way but I don't know if there is a easier way.

My steps to get the rotational FRF are:

- Create a remote point on the point of the part where you need rotational displacement
- Add the following APDL command to the remote point

     measure_pilot=_npilot

- Create an APDL command in the solution of the harmonic response (RS).

(Since I need the frequency range from 0 to 4000 Hz and the solution itervalls are 1000 I do this through a script)

set,list
*cfopen,'rot_z_FRF','txt'                 ! create a text file
*do, i, 1, 1000                                ! the solutions intervalls from the analysis settings
set,1,i,,AMPL                                
*get,my_freq,ACTIVE,,SET,FREQ
my_rot_z=ROTZ(measure_pilot)
*vwrite, my_freq, my_rot_z
(F8.0,g16.5)
*enddo
*cfclose

How can I read the value of the solutions intervalls automaticly from the analysis settings?

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