Set displacement limitation for the applied load

[SM1994]

Hello
I have a soft actuator, which is being inflated using internal pressure which results in the surface displacement of this soft actuator and reaches to, for instance, about 5mm of displacement.
I need to apply external pressure against the surface, but I need to keep this external pressure at a certain amount, so the surface displacement reduces for a maximum of 1mm.
What should I do?
Thanks

 

[FEA way]

You will most likely have to use UAMP/VUAMP subroutine to control the pressure with solution-dependent amplitude.