Brake 2 - MapleSim Help
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Brake 2

Rotational brake based on friction formula

 

Description

Connections

Parameters

Description

The Brake 2 component models a 1-D rotational brake with a frictional torque formula.

Sliding Friction

When in the sliding region, the frictional torque is given by

τ=fNreffμdωω1+μc1+peak1expωωsndecay

where

ω is the angular velocity of the shaft with respect to the support

ω1 is the unit angular velocity (1rads)

The peak parameter specifies the peak ratio of static friction to sliding friction when the viscous coefficient μd is zero.

Connections

Name

Description

Modelica ID

flangea

Flange of left shaft

flange_a

flangeb

Flange of right shaft

flange_b

support

Support/housing of component

support

fN

Normal force in newtons (brake is active if fN>0)

fn

Parameters

General Parameters

Name

Default

Units

Description

Modelica ID

Use support

false

 

True means support flange enabled, otherwise implicitly grounded

useSupport

μc

0

 

Coulomb coefficient of friction

mu_c

μd

0

 

Viscous coefficient of friction

mu_d

peak

1

 

Peak of ratio τstaticτsliding

peak

ωs

0.001

rads

Stribeck sliding angular velocity

ws

ndecay

2

 

Decay exponent

nDecay

reff

0.05

m

Geometry constant containing friction distribution assumption

r_eff

Advanced Parameters

Name

Default

Units

Description

Modelica ID

ωsmall

1·1010

rads

Relative angular velocity near to zero if jumps due to a reinit(..) of the velocity can occur (set to low value only if such impulses can occur)

w_small

See Also

1-D Mechanical Overview

Rotational Clutches and Brakes