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The acceleration of the motor is obtained by applying a force equal to the desired acceleration divided by the motor mass.Â Even though the acceleration is actually at the motor.Â Applying a base acceleration should produce the same relative results.Â The only error is that the base acceleration is applied to the entire model.Â Here are commands that apply a pressure psd based on a unit pressure applied in the modal:

sfdele,all,all

psdunit,2,press

lvscale,1! scale pressure from modal

psdfrq,2,,10,50,100,500,1000

psdval,2,0.01,0.02,0.022,0.042,0.03

pfact,2,node! nodal excitation

!dmprat,.01 ! damping ratio

psdcom

solve