Brake 2
Rotational brake based on friction formula
Description
Connections
Parameters
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=fN⁢reff⁢μd⁢ωω1+μc⁢1+peak−1⁢exp⁡−ωωsndecay
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.
Name
Modelica ID
flangea
Flange of left shaft
flange_a
flangeb
Flange of right shaft
flange_b
support
Support/housing of component
fN
Normal force in newtons (brake is active if fN>0)
fn
General Parameters
Default
Units
Use support
false
True means support flange enabled, otherwise implicitly grounded
useSupport
μc
0
Coulomb coefficient of friction
mu_c
μd
Viscous coefficient of friction
mu_d
peak
1
Peak of ratio τstaticτsliding
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
ωsmall
1·1010
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
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