Thanks for ur reply sir,

1) if I consider dynamic loading is slug, then from ur statement what I understand is at a particular node in x direction max displacement, one amplitude and in y direction max displacement second amplitude and same as in z. So at a particular node it has 3 amplitudes in 3directions (or) we have to consider max of these 3values ?. please clarify,

2)actuator is for valve operating , and iam not doing any dynamic loading for that system, iam just run the modal analysis to get the natural frequecies of the system( iam not considering about freq after 33hz), that is clear, now vendor is asking both freq and amplitude values. For the design of actuator for valve. What is the solution for this problem?