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MapleSim Hydraulics Library from Modelon

Gas Volume  Gas Volume

The Gas Volume component describes the behavior of the charge gas in an accumulator as an ideal gas.

 

Equations

Variables

Connections

Parameters

Constants

Equations

κ=gas2pκ2+gas1pκ+gas0

ρ=ρoilp=pabs,T=Toil,vair=vgasoil,psat=psat

pgas=pabs

qaccu=mflowAρ

Toil=T0oil+ΔTsystem

pκ=max5000000,min40000000,pgas

pabs=pA+patmoil

tpgas=qaccuκpgas1+1κpprecharge1κV0

Variables

Name

Value

Units

Description

Modelica ID

pabs

 

Pa

Absolute pressure

p_abs

ρ

 

kgm3

Gas Density

rho

Toil

 

K

Local temperature of oil

T_oil

psat

[1]

Pa

Gas saturation pressure

p_sat

κ

 

 

 

kappa

pgas

 

Pa

Gas pressure in accumulator, at t = 0 pgas >= pprecharge

pgas

pκ

 

 

 

pkappa

qaccu

 

m3s

 

qaccu

[1] oil.gasSaturationPressureT=Toil,vgas=oil.vgas

Connections

Name

Description

Modelica ID

portA

Hydraulic port where oil enters the component

port_A

oil

 

oil

Parameters

Name

Default

Units

Description

Modelica ID

ΔTsystem

0

K

Temperature offset from system temperature

dT_system

V0

0.001

m3

Nominal volume

V0

pprecharge

5.·106

Pa

Gas pre-charge pressure

pprecharge

pgast0

6.·106

Pa

Initial gas pressure (at t = 0)

pgasstart

Constants

Name

Value

Units

Description

Modelica ID

gas0

1.399353688

 

 

gas0

gas1

1.9·10-8

 

 

gas1

gas2

-2.86·10-16

 

 

gas2

See Also

Volumes

MapleSim Hydraulics Library from Modelon Overview

 


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