The hydraulic chamber, shown in fig. 1, is probably the most common hydraulic component and is associated with hydraulic device model, HydModl. The chamber, of volume V and cross-sectional area A, is filled with a hydraulic fluid of bulk modulus B under pressure p. Often, due to the presence of a piston, the length of the chamber can vary. The change in length of the chamber is denoted d. Finally, hydraulic fluid can flow into the chamber; Q denotes the net volumetric flow rate into the chamber.
The description and formulation of the hydraulic chamber and elements provides the relationships among these variables.