General Mechanical

General Mechanical

Harmonic Response Load

    • masud407
      Subscriber

      Hello Peter,


       


      I have a basic inquiry regarding harmonic response analysis in ANSYS. When we provide a magnitude of acceleration/displacement in any particular direction (X/Y/Z), does it mean a sinusoidal input or a step input?

    • peteroznewman
      Subscriber

      Hello,


      Your original Discussion got too long, so I moved your new question here.


      A load in a harmonic response analysis is a sinusoidal input of the amplitude of the sine function.


      Regards,


      Peter

    • kiarashniroumand
      Subscriber

      Hello Peter


      i have a problem in applying force in a harmonic response simulation


      the simulation is based on frequency response of a cantilever beam which has a fan on it that vibrates because of an unbalanced mass


      as you know an unbalanced mass produces a force like this F=(m*e*w^2)sin(w*time) where w is the excitation frequency


       


      the problem is in amplitude of the harmonic force , it is varying with frequency by a second order equation


      as i wanna get the frequency response deformation , it becomes important to define the frequency varying amplitude


      but in workbench 18.2 there is no choice to apply amplitude as a function of frequency , it has just constant and tabular data choice


      the tabular data can be varying by frequency simply , but it is so hard to define the load like this below


      frequency=1 hz , z component force=1


      frequency=2 hz , z component force=4


      frequency=3 hz , z component force=9


      frequency=4 hz , z component force=16


      ...


      ...


      frequency=2000 hz , z component force=4000000


       


      is there any way to define it easily by a function and expression ?

    • peteroznewman
      Subscriber

      Hello k,


      Use Excel. In column A, put 1, 2, 3... 2000 and in column B put the equation you want: A*A for example.
      Copy the 2000 rows x 2 column cells and paste into the Tabular Data window in Workbench.


      That's pretty easy right?


      Regards,
      Peter


      P.S. It's better to start a New Discussion because then you "own" the discussion and get notified of replies.

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