Thank you for the reply. I tried out the analysis by specifying the equation as shown in the figure for acceleration in transient structural and obtained the following graph for acceleration vs time. Now I need to simulate this for the following condition, can you please help me out with it.
3 shocks in positive direction followed by 3 shocks in negative direction of each three mutually perpendicular mounting positons of box for a total of 18 shocks. The rest of the conditions remain the same. 
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