I need to perform frequency response analysis (sol 111) in Nastran need to Apply unit acceleration I

cheerla3896

I need to perform frequency response analysis (sol 111) in Nastran need to Apply unit acceleration I have couple of question kindly suggest me execute this problem

1.SPCD IneedtobeConsider1or9810?

2. I need to apply multiple SPCDs since I'm working on the rear twist beam of a suspension system. It has 12 hard points, and I need to excite each hard point in all three directions (X, Y, Z).

While using SPCD, first I will activate SPC=1. Then, I will call RLOAD1 excitation SPCD. In the load step, the support is SPC. However, in the image below, I have two SPCs. One SPC will activate based on the excitation direction I apply. The other SPC needs to be applied in the global case control or neglected?I'm getting an error below.

Alberto Campagna

Hello,

for question 1 it depends on the unit measure system. If the model is in mm and you want to apply 1g you should input 9810 mm/s^2.

For 2 if you want to apply multiple excitations on the same lc you should add 1 spc for every spcd.

KR