Thanks very much for your help

1. Like what you stated, if I give the displacement input with the fixed rotation at the faces fastened to the shaker within transient structural of ANSYS. Then I need to subtract the input displacement to get the relative displacement. If I am correct, then how could I give the displacement/acceleration signal to the mass. therefore I do not need to subtract the base displacement if I would like to probe the Z-direction response of the IC chip.

Thanks very much, the information you provided is vey helpful.

Best Regards

Xiaofu Li