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Translational Brake

Brake based on Coulomb friction

 

Description

Connections

Parameters

Modelica Standard Library

Description

The Translational Brake (or Brake) component models a brake. A frictional force acts between the housing and a flange and a controlled normal force presses the flange to the housing to increase friction.

Normal Force

The normal force applied to the braking surface is the product of a parameter, fnmax, and a normalized input signal, fnormalized.

fn=fnmaxfnormalized0fnormalized1

Friction Force

When the absolute velocity is not zero, the friction force is a function of the velocity dependent friction coefficient μv , the normal force, fn, and a geometric constant, cgeo, which takes into account the geometry of the device and the assumptions on the friction distributions.

τ=cgeoμvfn

The geometric constant is calculated as

cgeo=Nro+ri2

where ri is the inner radius, ro is the outer radius, and N is the number of friction interfaces.

Friction Table

The μpos parameter is a two-dimensional table (array) that specifies the sliding friction coefficients at given relative velocities. Each row has the form vrel&comma;μvrel. The first column must be ordered, 0v1<v2<<vm. To add rows, right-click on the value and select Edit Matrix Dimension.

Connections

Name

Description

Modelica ID

flangea

Flange of left shaft

flange_a

flangeb

Flange of right shaft

flange_b

support

Conditional Support Flange

support

heatPort

Optional heat port

heatPort

fnormalized

Real input; normalized force

f_normalized

Parameters

General Parameters

Name

Default

Units

Description

Modelica ID

μpos

0.&comma;0.5

1

Table of sliding friction coefficients at given relative velocities

mue_pos

peak

1

1

peakμpos1&comma;2 is the static friction coefficient

peak

cgeo

1

1

Geometry constant containing friction distribution assumption

cgeo

fnmax

1

N

Maximum normal force

fn_max

Use Heat Port

false

 

True (checked) means heat port is enabled

useHeatPort

Use Support

false

 

True (checked) enables support flange

useSupport

Advanced Parameters

Name

Default

Units

Description

Modelica ID

vsmall

0.001

ms

Relative velocity near to zero (see model info text)

v_small

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 Friction and Stops