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I'm having issues with pressure calculations that I'm using for a double acting pneumatic cylinder. In my application, I start the piston near one end of the cylinder with both sides closed, and then move the piston towards the other end. At each point, I update the pressure, volume, and net force which is used to provide torque to the rest of my system. For some reason, the theoretical pressure values on the side that is being compressed are much larger compared to the experimental values that I've recorded, and as a result, my system is not producing as much torque as I had expected.

I am assuming an adiabatic process, so I am using the following equation:

P_{B}V_{B}^{γ}= P_{A}V_{A}^{γ}

where B and A stand for before and after the process, respectively. I then calculate P_{A}according to the above equation since the other three variables are known.

Any ideas what could be causing the discrepancy between my calculations and the actual values that I'm recording in the cylinder?

Thanks

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# Pressure inside pneumatic cylinder

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