Harmonic Response Load

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masud407 posted this 05 October 2018

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?

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peteroznewman posted this 05 October 2018

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 posted this 2 weeks ago

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 ?

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peteroznewman posted this 2 weeks ago

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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