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MapleSim Hydraulics Library from Modelon

Accu1  Hydro-pneumatic accumulator (simple gas model)

The Accu1 component describes a hydro-pneumatic accumulator filled with an ideal gas and a valve at the inlet port. Oil flows into the accumulator if the pressure at port_A is higher than the gas pressure, pgas. A lower limit is given for the gas pressure, pgas, by the precharge pressure, pprecharge. When initializing, the gas pressure, pgasstart, must be equal to or greater than the gas pre-charge pressure, pprecharge. There is a check whether this condition is met. This model will be replaced by a new model next release.

Related Components

Name

Description

Accu2

Hydro-pneumatic accumulator with a refined model of the charge gas.

 

Variables

Connections

Parameters

Variables

Name

Value

Units

Description

Modelica ID

pAsummary

pA

Pa

Pressure at port A

summary_pA

gasVolume

 

 

 

gasVolume

TWV

 

 

 

TWV

PMeas1

 

 

 

PMeas1

PMeas2

 

 

 

PMeas2

ValveLog

 

 

 

ValveLog

Connections

Name

Description

Modelica ID

oil

 

oil

portA

Port A, where oil flows into the component (0<q, pB<pA means 0<&Delta;p)

port_A

Parameters

General Parameters

Name

Default

Units

Description

Modelica ID

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

Oil Parameters

Name

Default

Units

Description

Modelica ID

VA

10-6

m3

Geometric volume at port A of TwoWayValve

volumeA

VB

10-6

m3

Geometric volume at port B of TwoWayValve

volumeB

Valve Parameters

Name

Default

Units

Description

Modelica ID

overlap

0.02

 

Overlap relative to max. displacement = 1

overlap

qnom

8.33·10-4

m3s

Nominal flow rate

qnom

&Delta;pnom

3.5·106

Pa

Pressure drop at qnom

dpnom

dleak

0

m

Diameter of equivalent orifice to model leakage of closed valve

dleak

k1

10

 

Laminar part of orifice model

k1

k2

2

 

Turbulent part, k2&equals;1Cd2

k2

ω0

500

rads

Natural frequency of spool

omega0

damp

1

 

Damping coefficient of spool

damp

See Also

Accu2

Volumes

MapleSim Hydraulics Library from Modelon Overview

 


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