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Translational Friction

Smooth friction between sliding bodies

 

Description

Variables

Connections

Parameters

Modelica Standard Library

Description

The  Translational Friction component represents friction in contact between sliding bodies. The friction is a smooth function of the relative velocity of the two flanges. This friction approximates the sum of Stribeck friction, Coulomb friction, and damping.

F=dvrel+tanhvrelv0fc+fsfcexpvrelvsn

fa=fb=F

srel=sbsa

vrel=s.rel

Variables

Name

Units

Description

Modelica ID

srel

m

relative distance

s_rel

vrel

ms

relative velocity, flange A to flange B

v_rel

Connections

Name

Description

Modelica ID

flangea

Left flange of compliant 1-dim. translational component

flange_a

flangeb

Right flange of compliant 1-dim. translational component

flange_b

Parameters

Name

Default

Units

Description

Modelica ID

d

0

Nsm

Viscous friction coefficient

d

fc

20

N

Coulomb friction force

fc

fs

25

N

Maximum sliding friction force

fs

n

1

1

Decay exponent

n

vs

0.1

ms

Stribeck sliding velocity coefficient

vs

v0

0.01

ms

Smoothing function scale, i.e. tanh(v_rel/v_0)

v_0

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