Model of a weight loaded accumulator. The pressure inside the accumulator is constantly at preload pressure. The preload pressure equals the load weight divided by the cross-section area of the accumulator:



where

p		:	Accumulator pressure
A		:	Piston area
m		:	Load mass
g		:	Standard acceleration of gravity on Earth

Implementation

A laminar restriction models the accumulator opening. The conductance of the restriction is put to zero when system pressure is lower than the preload pressure.

Limitations

The compressibility of the oil inside the accumulator is neglected.

Reference

Industrial Hydraulics Manual, 5th ed., Maumee, OH: Eaton Hydraulics Training Services, 2008 p. 470.

medium	Value: Oil() Type: Medium Description: Medium in the component
V0	Value: 0.001 Type: Volume (m³) Description: Maximum fluid volume
p0	Value: 10000000.0 Type: Pressure (Pa) Description: Preload pressure
G	Value: 1e-08 Type: ConductanceOfLaminarResistance (m³/(s⋅Pa)) Description: Conductance of laminar resistance
eventScaling	Value: 1000000.0 Type: Real Description: Parameter used to scale down variables so that events are triggered correctly