I am working on OpenModelica platform. I am trying to implement the model of Hydraulic Gear from "theurillat_tp.pdf" got this from internet https://people.inf.ethz.ch/fcellier/MS/ … lat_tp.pdf , but the piston is not available in OpenModelica. So how to add the piston part? Which Madelica library should I load to OpenModelica for piston?