Hello everyone,

I'm carrying out for the first time a dynamic analysis with Caesar and I have some doubts you might solve.

From surge analysis I got the following Force vs. Time plot:

http://img4.imageshack.us/img4/8509/fhs.png

this is the evolution over time of the upstream pressure during the closure of one emergency shut-down valve. During closure of ESD valves, the surge relief valves open.

My big question is: given this excitation shape, what is the best method to determine the response?

I would say Time History, but what about Force Spectrum analysis?

At the beginning I discarded the harmonic analysis but since the excitation seems to have a sinusoidal form with kind of damping, should I re-consider my ideas?

Thank you