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MapleSim Hydraulics Library from Modelon

Controlled Pressure Source  Simple pressure controlled pump

The Controlled Pressure Source component describes a pressure-controlled pump with externally commanded pressure, limited flow rate, and internal leakage. The pressure at the outlet port of this component may differ from the commanded value because of the settings of the controller (gain k) and the time constant T of the pump delay. If the boundary pressure should exactly follow the reference pressure model, then Ideal Pressure Source should be used instead.

 

Equations

Variables

Connections

Parameters

Equations

T=T0oil+ΔTsystem

pabs=pB+patmoil

Variables

Name

Value

Units

Description

Modelica ID

psat

[1]

Pa

Gas saturation pressure

p_sat

Vol

 

 

 

Vol

tank

 

 

 

tank

pabs

 

Pa

Absolute pressure, used for all property calls

p_abs

T

 

K

Local temperature

T

ρsummary

[2]

kgm3

Density

summary_rho

pBsummary

pB

Pa

Pressure at port B

summary_pB

FlowSource

 

 

 

FlowSource

PMeas1

 

 

 

PMeas1

Feedback1

 

 

 

Feedback1

Gain1

 

 

 

Gain1

Limiter1

 

 

 

Limiter1

FirstOrder1

 

 

 

FirstOrder1

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

[2] oil.densityp=pabs,T=T,vair=oil.vgas,psat=psat

Connections

Name

Description

Modelica ID

oil

 

oil

portB

Port B, where oil leaves the component (q<0, pB<pA means 0<&Delta;p)

port_B

commandSignal

Connector of input signal used as flow rate

commandSignal

pset

 

p_set

Parameters

General Parameters

Name

Default

Units

Description

Modelica ID

use input

true

 

If true, input port is present

useInput

G

5.·10-12

m3sPa

Conductance of pump leakage

G

use volume B

true

 

If true, a volume is present at port B

useVolumeB

&Delta;Tsystem

0

K

Temperature offset from system temperature

dT_system

pbias

5.·106

Pa

Bias of pressure

pbias

qmax

0.05

m3s

Maximum pump flow rate

qMax

t

0.05

s

Time constant of pressure control system

t

k

10-6

 

Gain of pressure controller

k

Oil Parameters

Name

Default

Units

Description

Modelica ID

VB

10-6

m3

Geometric volume at port B

volumeB

Constant Parameters

Name

Default

Units

Description

Modelica ID

qmin

0

m3s

Minimum pump flow rate

qMin

See Also

Ideal Pressure Source

Pumps

MapleSim Hydraulics Library from Modelon Overview

 


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