i need to model this pneumatic cycle using Simscape

This model represents a real physical system in Automation Studio

-I am trying to model it using SimScape (to see the inflation and deflation times), but I have encountered two challenges.

In a real system, there are more elements that do not exist in SimScape fluid, for instance, a pressure regulator.

There are a number of parameters that are not included in the datasheet i have for DirectionalValve (G)

I made this model and when I run it, it shows the following error:

Thank you so much in advance

Answer 1

[Yifeng Tang]

The A-port of the two-way direction valve is connected to Pressure sensor, which allows no flow, so no flow can occur in this network. You will need a way to specify the boundary conditions in your model, like inlet & outlet temperature and pressure. The easiest way is to use the Reservoir (G) block. The absolute reference block you have now represents 0 Pa of pressure and 0 K of temperature. It's useful as a reference point for Pressure and Temperature sensors, but not good as boundary conditions. If the pressure source in your model is trying to get B port pressure higher than A, the reference block at the B end will then force the A port to have negative absolute pressure, and break all rules of thermodynamics :p