PropValve33PT2

    PropValve33PT2

Library

Components/Valves/DirectionalValves

Description

The component PropValve33PT2 is a model of a 3-way proportional valve where the stroke follows the input signal with a 2nd order delay.

For a positive stroke (right position), the flow is scaled in proportion to the input signal starting from 0 to Input value for 100 % open with nominal flow (as given by Nominal volume flow/Nominal pressure difference) corresponding to an input value of Input value for 100 % open. In case of a negative stroke (left position) the same applies for input from 0 to -Input value for 100 % open.

The valve stroke can be shifted by Valve edge general relative overlap. In accordance with common valve parameters a negative overlap will open the valve edge. Valve edge general relative overlap is applied to all valve edges simultaneously. If at least one of the edge-specific values, e. g. Valve edge PA relative overlap is set to a value different from 0, then Valve edge general relative overlap is ignored and the individual overlaps are used.

The default relationship between input signal and flow rate of the metering edge 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 metering edge. 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 CombiTable1D.

Parameters

PropValve33PT2_0

NameLabelDescriptionData TypeValid Values

mo_inputMax

inputMax

Input value for 100 % open

Scalar

mo_angFreq

angFreq

Angular frequency

Scalar

mo_damping

damping

Damping

Scalar

mo_vMax

vMax

max. Velocity

Scalar

mo_vMin

vMin

min. Velocity

Scalar

mo_enableStrokeOut

enableStrokeOut

Enable Stroke Output

Number

0
1

mo_deadVolume

deadVolume

Dead volume at ports

Scalar

mo_inputMaxPartial

inputMaxPartial

Scalar

mo_eps

eps

Scalar

mo_initType

initType

Type of initialization (1: no init, 2: steady state, 3/4: initial output)

Structure

mo_initType/choice1

No initialization (start values are used as guess values with fixed=false)

Number

0
1

mo_initType/choice2

Steady state initialization (derivatives of states are zero)

Number

0
1

mo_initType/choice3

Initialization with initial states

Number

0
1

mo_initType/choice4

Initialization with initial outputs (and steady state of the states if possible)

Number

0
1

PropValve33PT2_1

NameLabelDescriptionData TypeValid Values

mo_NominalVolumeFlow

NominalVolumeFlow

Nominal volume flow

Scalar

mo_NominalPressureDifference

NominalPressureDifference

Nominal pressure difference

Scalar

mo_ReferenceDensity

ReferenceDensity

Reference density for volume flow and pressure difference

Scalar

mo_Overlap

Overlap

Valve edge general relative overlap

Scalar

mo_OverlapPA

OverlapPA

Valve edge PA relative overlap

Scalar

mo_QFactorPA

QFactorPA

Factor for edge PA specific flow adjustment

Scalar

mo_tableFromFilePA

tableFromFilePA

Table is provided by file

Scalar

true
false

mo_fileNamePA

fileNamePA

File where look-up table is stored

String

mo_tableNamePA

tableNamePA

Table name on file

String

mo_manualTablePA

manualTablePA

Manually provided look-up table

Matrix

mo_OverlapAT

OverlapAT

Valve edge AT relative overlap

Scalar

mo_QFactorAT

QFactorAT

Factor for edge AT specific flow adjustment

Scalar

mo_tableFromFileAT

tableFromFileAT

Table is provided by file

Scalar

true
false

mo_fileNameAT

fileNameAT

File where look-up table is stored

String

mo_tableNameAT

tableNameAT

Table name on file

String

mo_manualTableAT

manualTableAT

Manually provided look-up table

Matrix

mo_ZeroVolumeFlow

ZeroVolumeFlow

Volume flow due to leakage

Scalar

mo_ZeroFlowPressureDifference

ZeroFlowPressureDifference

Pressure difference for leakage flow

Scalar

PropValve33PT2_2

NameLabelDescriptionData TypeValid Values

mo_valveStrokeOut

valveStrokeOut

valveStrokeOut

Structure

mo_valveStrokeOut/fixed

fixed

Cell of scalars

true
false

mo_valveStrokeOut/start

start

Cell of scalars

mo_pP

pP

pP

Structure

mo_pP/fixed

fixed

Cell of scalars

true
false

mo_pP/start

start

Cell of scalars

mo_pT

pT

pT

Structure

mo_pT/fixed

fixed

Cell of scalars

true
false

mo_pT/start

start

Cell of scalars

mo_pA

pA

pA

Structure

mo_pA/fixed

fixed

Cell of scalars

true
false

mo_pA/start

start

Cell of scalars

mo_Input

Input

Input

Structure

mo_Input/fixed

fixed

Cell of scalars

true
false

mo_Input/start

start

Cell of scalars

mo_Stroke

Stroke

Stroke

Structure

mo_Stroke/fixed

fixed

Cell of scalars

true
false

mo_Stroke/start

start

Cell of scalars

mo_Velocity

Velocity

Velocity

Structure

mo_Velocity/fixed

fixed

Cell of scalars

true
false

mo_Velocity/start

start

Cell of scalars

Ports

NameTypeDescriptionIO TypeNumber

portA

implicit

Hydraulic port A

input

1

portP

implicit

Hydraulic port P

input

2

portT

implicit

Hydraulic port T

input

3

Input

implicit

Set value of valve position

input

4

Port 5

implicit

Valve Stroke

output

mo_enableStrokeOut