I'm modeling a cylindrical tank (shell elements for base and tube parts) to simulate acceleration base motion in x, y and z directions to obtain displacements.
What I've done is explained below;
Using Linear Perturbation Step, I've created two steps to accommodate my amplitude tabular data, which are my frequency step and my modal dynamic step.
With the modal dynamic step created, Next I've created an acoustic impedance interaction to both parts which formed the assembly.
Following, I applied three boundary conditions and applied the respective amplitude data in the respective direction. (Assumed EW=X, NS=Y, UP=Z)
Following this, I created the instance, meshed the assembly and assigned an element type, named acoustic.
In this pop up with respect to the element type, it had the option for the modeling intent being Infinite and Interface, I chose Infinite.
I proceeded to run the analysis and that's where the below error occurred.
"Underlying acoustic infinite element 1 instance base-1 can only have spos or edge face identifiers"
Check the orientation of the surfaces in the interaction - possibly, one surface is inverted (i.e. normal pointing away from the other)
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