IdealResistorVariable

    IdealResistorVariable

Library

HydraulicsByFluidon/Components/Resistors

Description

The component IdealResistorVariable is a model of a flow resistance that behaves either as an orifice or a throttle, depending on the parameter setting.

Flow is adjusted via the input signal with nominal flow (as given by Nominal volume flow at Nominal pressure difference) corresponding to an input value of 1 (relative adjustment).

Both are parameterized by the parameters Nominal volume flow at Nominal pressure difference, measured with a fluid with Reference density.

Throttle

Orifice

The default relationship between input signal and flow rate of the resistor is linear, but can be changed through the use of a 1D look-up table. The look-up table is provided either manually or by importing a text file. If the parameter Table is provided by file is set to false, the manually entered datapoints from Manually provided look-up table will be used. If it is set to true, the table Table name on file from the file File where look-up table is stored will be utilized.

The text file must follow a specific syntax such that it can be read by Modelica. The input values as well as the output values must lie within the range from 0 to 1. An output value of 1 (100 %) corresponds to a fully-opened resistor. An example for a properly formatted text file with two tables is given in the figure below:

A table is declared by its datatype (e. g. double), followed by the table name (e. g. tab1) and its dimensions in brackets (e. g. (5,2)). As can be seen, multiple tables can be defined in the same text file. The table declaration is followed by the actual data. The first column of the table represents the input of the 1D table, whereas the second column lists the corresponding output values. The input values of the table must be in increasing order. The component interpolates linearly between the listed input values. More information regarding the format of tables can be found at CombiTable1Ds.

Parameters

IdealResistorVariable_0

NameLabelDescriptionData TypeValid Values

mo_dp

dp

dp

Structure

mo_dp/fixed

fixed

Cell of scalars

true
false

mo_dp/start

start

Cell of scalars

mo_rho

rho

rho

Structure

mo_rho/fixed

fixed

Cell of scalars

true
false

mo_rho/start

start

Cell of scalars

mo_InputMax

InputMax

Scalar

mo_resistorType

resistorType

Type of the resistor

Structure

mo_resistorType/choice1

HydraulicsByFluidon.Types.TResistorTypes.Orifice

Number

0
1

mo_resistorType/choice2

HydraulicsByFluidon.Types.TResistorTypes.Throttle

Number

0
1

mo_NominalVolumeFlow

NominalVolumeFlow

Nominal volume flow

Scalar

mo_NominalPressureDifference

NominalPressureDifference

Nominal pressure difference

Scalar

mo_ReferenceDensity

ReferenceDensity

Reference density

Scalar

mo_coefficient

coefficient

Scalar

mo_conductance

conductance

Scalar

mo_ZeroCoefficient

ZeroCoefficient

Scalar

mo_ZeroVolumeFlow

ZeroVolumeFlow

Volume flow due to leakage

Scalar

mo_ZeroFlowPressureDifference

ZeroFlowPressureDifference

Pressure difference for leakage flow

Scalar

mo_inputMin

inputMin

Scalar

mo_tableFromFile

tableFromFile

Table is provided by file

Scalar

true
false

mo_fileName

fileName

File where look-up table is stored

String

mo_tableName

tableName

Table name on file

String

mo_manualTable

manualTable

Manually provided look-up table

Matrix

IdealResistorVariable_1

NameLabelDescriptionData TypeValid Values

mo_forwardFluidProperties

forwardFluidProperties

Forward fluid properties between ports

Scalar

true
false

IdealResistorVariable_2

NameLabelDescriptionData TypeValid Values

mo__nmodifiers

Number of Modifiers

Specifies the number of modifiers

Number

mo__modifiers

Modifiers

Add new modifier

Structure

mo__modifiers/varname

Variable name

Cell of strings

'volumeFlowA'
'volumeFlowB'
'fluidId'
'ResistanceFlowB'
'signDp'
'dpMax'
'InputSignal'

mo__modifiers/attribute

Attribute

Cell of strings

'start'
'fixed'

mo__modifiers/value

Value

Ports

NameTypeDescriptionIO TypeNumber

fluidPortA

implicit

Hydraulic port A

input

1

fluidPortB

implicit

Hydraulic port B

input

2

u

implicit

input

3

See Also