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How to apply a time dependent sinusoidal body load?

Posted 22 août 2018, 16:43 UTC−4 Structural & Acoustics, Parameters, Variables, & Functions, Studies & Solvers 4 Replies

punnagNCSU
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I have a solid mechanics module + time dependent study. How can I apply a sinusoidal time dependent load (to simulate sinusoidal base excitation)?

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P.C.
4 Replies Last Post 23 août 2018, 10:58 UTC−4
Dave Greve
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Posted: 7 years ago 22 août 2018, 17:14 UTC−4

BEFORE doing a time dependent study- find out whether a frequency dependent (sinusoidal steady state) analysis is sufficient.

Sinusoidal steady state is easier to set up and almost always converges.

BEFORE doing a time dependent study- find out whether a frequency dependent (sinusoidal steady state) analysis is sufficient. Sinusoidal steady state is easier to set up and almost always converges.
punnagNCSU
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Posted: 7 years ago 22 août 2018, 17:18 UTC−4
Updated: 7 years ago 22 août 2018, 17:18 UTC−4

@D Greve, thanks for the reply.

Hi I am looking for nonlinear (geometric) large deflection response and I think time dependent would be most apt.

I am trying to apply the load (base excitation) as a body force (as shown in the snapshot attacked to my 1st post). Any suggestions?

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P.C.
@D Greve, thanks for the reply. Hi I am looking for nonlinear (geometric) large deflection response and I think time dependent would be most apt. I am trying to apply the load (base excitation) as a body force (as shown in the snapshot attacked to my 1st post). Any suggestions?
Jeff Hiller COMSOL Employee

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Posted: 7 years ago 23 août 2018, 07:22 UTC−4

You can type a mathematical expression like the one in your screenshot, but the variable for time is "t", not "time".

Best,

Jeff

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Jeff Hiller
You can type a mathematical expression like the one in your screenshot, but the variable for time is "t", not "time". Best, Jeff
Dave Greve
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Posted: 7 years ago 23 août 2018, 10:58 UTC−4

Hi I am looking for nonlinear (geometric) large deflection response

In that case I agree you will need to do time dependent analysis.

Be aware that the system may take a very long time to reach steady state if it is lightly damped. Running a very long time-dependent simulation takes considerable computation time and may diverge.

> Hi I am looking for nonlinear (geometric) large deflection response In that case I agree you will need to do time dependent analysis. Be aware that the system may take a very long time to reach steady state if it is lightly damped. Running a very long time-dependent simulation takes considerable computation time and may diverge.

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