Brake based on Coulomb friction
Modelica Standard Library
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.
The normal force applied to the braking surface is the product of a parameter, fnmax, and a normalized input signal, fnormalized.
When the absolute velocity is not zero, the friction force is a function of the velocity dependent friction coefficient μ⁡v , 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.
The geometric constant is calculated as
where ri is the inner radius, ro is the outer radius, and N is the number of friction interfaces.
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,μ⁡vrel. The first column must be ordered, 0≤v1<v2<⋯<vm. To add rows, right-click on the value and select Edit Matrix Dimension.
Flange of left shaft
Flange of right shaft
Conditional Support Flange
Optional heat port
Real input; normalized force
Table of sliding friction coefficients at given relative velocities
peak⁢μpos1,2 is the static friction coefficient
Geometry constant containing friction distribution assumption
Maximum normal force
Use Heat Port
True (checked) means heat port is enabled
True (checked) enables support flange
Relative velocity near to zero (see model info text)
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.
1-D Mechanical Overview
Translational Friction and Stops
Download Help Document
What kind of issue would you like to report? (Optional)