Table of Contents
Stefen Merkle
PRZ- TU-Berlin
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In cooperation with the department of gearing and transmission technology at the Technical University of Berlin the idea was developed to create an application with which the thermal behaviour of brake systems could be analysed by simulating stopping processes. This application should be able to display the brake and colour it referring to its temperature. A graph which shows the temperature over the passed time was demanded, too. Another expected feature was to let BRAKE be as flexible as possible for describing the simulation by parameters.
BRAKE simulates the thermodynamic behaviour of brake systems.
This application can be used for teaching the conception of friction systems as well as for research and development of new or existing brake systems.
In lectures students get experience with:
- the influence of different brake linings (change of the coefficient of friction).
- the influence of a change in area pressure.
- the influence, if a gearing is connected to the system (moment of inertia).
- the influence of different brake systems (disc vs drum).
Research and development are supported by BRAKE in the following way:
- Layout of a specific experimental parameters to operate a computer controlled gyratic mass test bench.
- Design of brake systems. For a given revolution speed, load and stopping time, a suitable brake system including the according friction pair will be selected.
- The development and transformation of friction layers caused by different coefficients of friction in the friction layer can be analysed.
- The effects of water, white frost and ice on a friction system can be analysed.
- On a test bench, where parts of lining are tested, diagrams showing the relation between coefficients of friction and the temperature are recorded and may be used within the BRAKE application.
BRAKE simulates the thermodynamic processes in a brake. Therefore a model of the disc of the brake must be created. This is done by describing the disc in polar coordinates where the disc is divided into layers, tracks and sectors.
The computation of the diffusion of heat within the disc is done by a differential method.
BRAKE is a useful tool for teaching the conception of friction systems and for research and development of brake systems.
The application actually is tested by the researchers at the department of gearing and transmission technology. They are actually trying to include it into the curriculum where they teach the fundamentals of brake systems. The students shall try to develop a parametrization for a brake system that has to fulfil specified requirements.