How can I apply different PSD excitations in the x and z directions in Simulation 11.0?


You could use commands like the ones below in a Commands Object in the Random Vibration branch.


cmsel,s,fixedsu ! Predefined nodal component for all fixed nodes
d,all,uz,1
d,all,ux,0.5 ! Smaller excitation in x direction.
cmsel,all
nsel,all

psdfrq
psdfrq,1,,5,10,15,20,30,60
psdfrq,1,,100

psdval,1,0.0009,0.017,0.04,0.035,0.007,0.0045
psdval,1,0.0002
pfact,1

psdcom
solve
fini





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