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Translational Speed

Forced movement of a flange according to a reference speed

 

Description

Equations

Variables

Connections

Parameters

Modelica Standard Library

Description

The Translational Speed (or Speed) component generates a forced translational speed according to an input signal, vref

The Exact boolean parameter determine how vref is used:

When Exact is true, vref is used as-is. The input signal must be differentiable.

When Exact is false (the default), vref is filtered and the derivative of the filtered curve is used to compute the reference acceleration of the flange. This derivative is not computed by numerical differentiation but rather by a first-order filter. The critical frequency (cut-off frequency) of the filter is defined by the parameter fcrit, which should be higher than the essential low frequencies in the signal.

The Use Support Flange boolean parameter enables a support flange on the housing. When true (checked) the support flange must be connected in the drawing. When false the component is internally fixed to ground.

Equations

{a=0,v=vrefExacta=vrefvvcrit,a=v.otherwise

wcrit=2πfcrit

v=s.

if Use Support Flange then fsupport=f

s=sflange{ssupportUse Support0otherwise

Variables

Name

Units

Description

Modelica ID

a

ms2

Acceleration of flange with respect to support

a

fsupport

N

Force acting at support

support.f

s

m

Distance between flange and support

s

sflange

m

Position of flange

flange.s

ssupport

m

Position of support

support.s

v

ms

Velocity of flange with respect to support

v

Connections

Name

Description

Modelica ID

flange

Flange of component

flange

support

Conditional Support Flange

support

vref

Real input; reference speed in ms

v_ref

Parameters

Name

Default

Units

Description

Modelica ID

Exact

false

 

True (checked) means the reference position is treated exactly

exact

fcrit

50

Hz

Critical frequency of input signal when exact is set to false

f_crit

Use Support Flange

false

 

True (checked) enables support flange

useSupport

Modelica Standard Library

The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.

See Also

1-D Mechanical Overview

Translational Motion Drivers