General Mechanical

General Mechanical

Frequency Response Function (FRF) for rotation in ANSYS Workbench

    • azolo
      Subscriber

      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.

    • azolo
      Subscriber

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

    • peteroznewman
      Subscriber

    • azolo
      Subscriber

      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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