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How to simulate air spring?

NX motion simulation already have solid sping simulation type, but air sping is not yet. Relation between Force with displacement are difference.
- Solid sping: F = -k.x 

                           with F: Force

                                    x: Displacement



- Air sping: F = -p1.s = -p0.(H/(H-x)).s

                    with F: Force

                             p1: Pressure

                             p0: Initial pressure



So, What should I do to simulate air sping?