Learning Forum

[Fabián Peña]

As entitled, using Ansys Mechanical I aim to do a pre-stress Harmonic Response analysis using a displacement harmonic load, however, I haven't been able to set it up correctly. I tried two approaches, a full harmonic analysis and then one with mode superposition.

In the full analysis, I used a static structural analysis to provide the pre-stress condition, however, the displacement harmonic load is not available.

When using mode superpositon, after the static structural analysis, there's a modal analysis, and then the harmonic analysis. The displacement harmonic load is availale, but there's an error message saying that this type of load cannot be used when the solution method is set to Mode Superposition, and it's not possible to change it to another solution method.

It's worth pointing out that in the static analysis, the surface that is subjected to harmonic displacement in the harmonic analysis, is set as a Fixed Support.

Any help wil be appreciated.

Cheers,

Fabián 

[Anuja Burambadkar]

test reply

[peteroznewman]

Hello Fabián,

I have a Static Structural model with a Fixed Support and a load. The solution of that is linked to the Setup cell of the Harmonic Response to get a Pre-Stress Full solution.

I picked the face of the Fixed Support and made a Named Selection.  Then I right clicked on that NS and selected Create Nodal Named Selection.

In the Harmonic Response, I was able to insert a Nodal Displacement, selected the Nodal Named Selection and applied the displacement amplitude into the components. This model solved and I was able to plot the Deformation at the frequency of interest.

Good luck!

Peter