Well
We had a problem with a valve that open and close very fast.

In my first calculation i get one time history analysis when the valve close. But the results was very different in comparation with the reality.(in the plant)

IN my opinion , the problem is that i have simulated only one event, what would happen if when the pressure wave come back to the valve, the valve open? Maybe resonance?

How can i simulate more events and so check the possibility of resonance?

thanks so much