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Applying a force incrementally

Question asked by Nicholas Cassidy on Dec 20, 2016
Latest reply on Dec 21, 2016 by Seckin Uslu

I am attenpting to run a simulation under specific requirments i was given. 


The simulation is a pressure vessel with legs welded onto it. That legs gets bolted to a containment frame, which then in turn gets bolted to a vessels floor.


I ran the simulation with the force of the liquid at a 30 degree static heel.  I now have to add the following forces:


"Acceleration of +/-.5g parallel to the deckhouse" (simulating a vessel moving forward and backward)

"Acceleration of +/-1g perpendicular to deckhouse" (stimulating a vessel moving up and down)


My question is, is there a way to apply this force incrementally? Meaning the force starts at -1g and moves to +1g over a period of lets say 5 seconds. 


My initial thought would be to multiply the mass (x1 for 1g and x.5 for .5g) and apply that force,but i need to show a time span of how these forces effect the pressure vessel moving. i cannot seem to figure out how to apply these force as described.


Thank you for your time!