sine excitation

Hi all.

I am performing a 2D frequency analysis in the Structural Mechanics Module.

I want to apply a prescribed displacement on the left boundary and to see which waves propagate inside the medium. The prescribed displacement is a sine wave of 5 cycles with a certain frequency.

Could anyone tell me how to apply this boundary condition?

If I perform a time-dependent analysis, I can define a piecewise function using t (time) as argument, but this doesn't work in the frequency analysis.

I want to perform a frequency analysis mainly for two reasons:

1. The medium is a thin layer and the time-dependent analysis doesn't give the expected solution. The resulting waves are undersampled even if I use the proper time-step and maximum element size.

2. I would like to avoid reflections from the boundaries and PML doesn't work in the time-domain.

Any suggestion is more than welcome!!!

Best regards
Ramona