WOLFRAM SYSTEMMODELER

Speed

Forced movement of a flange according to a reference angular velocity signal

Wolfram Language

In[1]:=
SystemModel["Modelica.Mechanics.Rotational.Sources.Speed"]
Out[1]:=

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

The input signal w_ref defines the reference speed in [rad/s]. Flange flange is forced to move relative to flange support according to this reference motion. According to parameter exact (default = false), this is done in the following way:

  1. exact=true
    The reference speed is treated exactly. This is only possible, if the input signal is defined by an analytical function which can be differentiated at least once. If this prerequisite is fulfilled, the Modelica translator will differentiate the input signal once in order to compute the reference acceleration of the flange.
  2. exact=false
    The reference angle is filtered and the second derivative of the filtered curve is used to compute the reference acceleration of the flange. This second derivative is not computed by numerical differentiation but by an appropriate realization of the filter. For filtering, a first order filter is used. The critical frequency (also called cut-off frequency) of the filter is defined via parameter f_crit in [Hz]. This value should be selected in such a way that it is higher as the essential low frequencies in the signal.

The input signal can be provided from one of the signal generator blocks of the block library Modelica.Blocks.Sources.

Parameters (2)

useSupport

Value: false

Type: Boolean

Description: = true, if support flange enabled, otherwise implicitly grounded

f_crit

Value: 50

Type: Frequency (Hz)

Description: If exact=false, critical frequency of filter to filter input signal

Connectors (3)

flange

Type: Flange_b

Description: Flange of shaft

support

Type: Support

Description: Support/housing of component

w_ref

Type: RealInput

Description: Reference angular velocity of flange with respect to support as input signal

Used in Examples (8)

SMEE_LoadDump

Modelica.Electrical.Machines.Examples.SynchronousInductionMachines

Test example: ElectricalExcitedSynchronousInductionMachine with voltage controller

SMEE_Rectifier

Modelica.Electrical.Machines.Examples.SynchronousInductionMachines

Test example: ElectricalExcitedSynchronousInductionMachine with rectifier

SMEE_LoadDump

Modelica.Magnetic.FundamentalWave.Examples.BasicMachines

Test example: ElectricalExcitedSynchronousInductionMachine with voltage controller

SMEE_Rectifier

Modelica.Magnetic.FundamentalWave.Examples.BasicMachines

Test example: ElectricalExcitedSynchronousInductionMachine with rectifier

IMC_Characteristics

Modelica.Magnetic.QuasiStatic.FundamentalWave.Examples.BasicMachines.InductionMachines

Characteristic curves of Induction machine with squirrel cage

IMS_Characteristics

Modelica.Magnetic.QuasiStatic.FundamentalWave.Examples.BasicMachines.InductionMachines

Characteristic curves of induction machine with slip rings

PumpAndValve

Modelica.Thermal.FluidHeatFlow.Examples

Cooling circuit with pump and valve

WaterPump

Modelica.Thermal.FluidHeatFlow.Examples

Water pumping station