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MapleSim Hydraulics Library from Modelon

Pump With Loss  Pump with constant displacement and table-based mechanical efficiency

 

Equations

Variables

Connections

Parameters

Equations

T=T0oil+ΔTsystem

q=mflowAρoilpAabs,T,vair=vgasoil,psat=psat

w=tφa

Δp=pAlimitedpBlimited

pAabs=pA+patmoil

pAlimited=maxpA,pvapouroilpatmoil

pBabs=pB+patmoil

pBlimited=maxpB,pvapouroilpatmoil

Variables

Name

Value

Units

Description

Modelica ID

Δp

 

Pa

Pressure drop

dp

pAlimited

 

Pa

Limited gauge pressure

pA_limited

pBlimited

 

Pa

Limited gauge pressure

pB_limited

pAabs

 

Pa

Absolute pressure

pA_abs

pBabs

 

Pa

Absolute pressure

pB_abs

q

 

m3s

Flow rate at connector A

q

w

 

rads

Angular velocity of pump shaft

w

T

 

K

Local temperature

T

pAsummary

pA

Pa

Pressure at port A

summary_pA

pBsummary

pB

Pa

Pressure at port B

summary_pB

Δpsummary

Δp

Pa

Pressure drop

summary_dp

qsummary

q

m3s

Flow rate flowing into port_A

summary_q

Pmechsummary

[1]

W

Mechanical Rotational Power

summary_MP

Phydsummary

Δpq

W

Hydraulic Power

summary_HP

psat

[2]

Pa

Gas saturation pressure

p_sat

VA

 

 

 

VolumeA

VB

 

 

 

VolumeB

Ta

 

 

 

Ta

Ta1

 

 

 

Ta1

LamnS

 

 

 

LamnS

energyLoss

 

 

 

energyLoss

fixedTemperature

 

 

 

fixedTemperature

fixed

 

 

 

fixed

ICP

 

 

 

ICP

Rotor

 

 

 

Rotor

w1

 

 

 

w1

εmech

 

 

 

eps_m_table

const2

 

 

 

const2

[1] ϕ.aτa+ϕ.bτb

[2] oil.gasSaturationPressureT,oil.vgas

Connections

Name

Description

Modelica ID

portA

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

port_A

portB

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

port_B

flangea

 

flange_a

flangeb

 

flange_b

oil

 

oil

Parameters

General Parameters

Name

Default

Units

Description

Modelica ID

&Delta;Tsystem

0

K

Temperature offset from system temperature

dT_system

external leakage

true

 

If true, a small amount of oil leaks to the tank components

externalLeakage

use volume A

true

 

If true, a volume is present at port_A

useVolumeA

use volume B

true

 

If true, a volume is present at port_B

useVolumeB

Gext

10-13

m3sPa

Conductance of external leakage

Gext

Gint

5.·10-12

m3sPa

Conductance of the internal motor leakage

Gint

Dpump

10-4

m3

Displacement per revolution

Dpump

GPint

10-13

m3sPa

Conductance of internal leakage

GPint

J

0.01

kgm2

Moment of inertia

J

td

0

 

Friction coefficient#

td

table eps[m]

[0,9/10; 1,9/10]

 

Table for mechanical efficiency, eps_m

table_eps_m

variable mechanical efficiency

true

 

Include variable mechanical efficiency

variableMechanicalEfficiency

εmechconst

910

 

Mechanical efficiency, if constant value

eps_m_constant

Oil Parameters

Name

Default

Units

Description

Modelica ID

VA

10-6

m3

Geometric volume at port A

volumeA

VB

10-6

m3

Geometric volume at port B

volumeB

See Also

Pumps

MapleSim Hydraulics Library from Modelon Overview

 


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