how can I get rid of transient situation in Time Dependent study

I use "Solid Mechanics" and apply a sinusoidal displacement on a cube. I need the displacement of each point at different times. I use Time Dependent study, but the problem is that it shows the transient time when the sin wave is not an ideal sin. I need steady state. So, do you have any opinion how can I get rid of transient situation?

Thanks.