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MapleSim Hydraulics Library from Modelon

Id Var Pump  Ideal pump with variable displacement

This component describes an ideal pump with variable displacement.

Implementation

The flow rate (q) is given by:

q = Dpump  w  sig  factor / (2  π)

The commanded relative displacement volume of the pump is input at commandSignal, [-1 ... 1]. If the inlet pressure is lower than the atmospheric pressure, the delivered flow rate becomes smaller (that is, the value of factor decreases). Flow from port_A to port_B is considered positive.

Variables used in the above equation

q

Flow rate at the outlet port m3s.

Dpump

Maximum displacement per revolution m3.

w

Angular velocity rads.

sig

−1commandSignal<−11commandSignal>1commandSignalotherwise

factor

Pressure dependent variable. Equals 1 at normal running conditions and 0 at vapor pressure.

Assumptions

Ideal pump (that is, no losses).

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

commandSignal

Input signal commands relative displacement volume

commandSignal

Parameters

Name

Default

Units

Description

Modelica ID

&Delta;Tsystem

0

K

Temperature offset from system temperature

dT_system

Dpump

10-4

m3

Displacement per revolution

Dpump

See Also

Pumps, MapleSim Hydraulics Library from Modelon Overview


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