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Ansys Workbench Harmonic analysis, full model vs mode superposition

Ansys Workbench Harmonic analysis, full model vs mode superposition


I am doing simulations to see how much a structure deforms when exciting with a acceleration amplitude on the full body, frequency range 0-200 Hz.
Currently I am using a damping ratio of 1% in the in the mode superposition method. I also tried the full model but the result is very different, with alot higher deformation. However I havent specified any damping ratio in the full method since it doesnt seem to have one equivalent to the superposition method.

Which method can I trust to give me the actual deformation of the structure?
Also is a damping ratio of 1% ok or should I decrease it to give even more margin? It is a bolted aluminium structure.


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