Thesis Work – Heat transient transfer analysis of brake disc/pad
system
Background
During early phases of a car project, the brake system is dimensioned in order
to fulfil given requirements. Among the requirements, limiting values for the
brake disc and pad temperatures at given load cases are defined. This is crucial
in estimating brake performance as temperature strongly affect pad/disc friction
and material properties. Prediction of the temperature distribution specifically
in the brake disc and pads during the heat exchange which occurs during braking manoeuvres can be obtained through heat transient transfer analysis using
e.g. finite element simulations. Although heat transient transfer analysis is
standard procedure in all commercial FE solvers, it is desirable to couple the
thermal model together with other active safety blocks (electronic brake system
block such as ABS, …) which simulate specific braking manoeuvres in Simulink/Dymola-based vehicle dynamics environment. At the present stage, the
thermal model is a one-dimensional heat transient transfer analysis based on a
simplified axisymmetric disc/pad system solved with finite difference method.
However, due to the lack of documentation on the code development and setup of boundary conditions it might be suitable to newly develop the code choosing in that case FE method. The code should be computationally efficient. Results on temperature distribution should be validated with respect to test results. The candidate might be responsible for setting up a suitable set plan for
validation.
Additionally, as an extension, specifically the load case of Alpine Descent is of
interest. The Alpine Descent consists of downhill constant speed braking for a
long period of time. At the end of the braking phase, when the car is parked
and standstill, the disc and pad temperatures start to decrease immediately
while the brake fluid temperature increases due to natural convection from the
surrounding hot components and bad air cooling at standstill. This would require
an extension of the thermal model to include a simplified fluid model and proper
boundary conditions. This to avoid full CFD calculations which are time consuming during early project phases.
Scope
This thesis work will include the following parts:
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Literature survey to understand the physics behind the disc/pad heat
transfer generated heat during different braking manoeuvres.
Implementation of brake disc/pad heat transient transfer analysis in
Simulink.
Verification of the model using a commercial FE solver.
Validation with respect to test data
Detailed documentation in thesis report.
Desired qualification
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Good knowledge of Finite Element theory and heat transient transfer
analysis.
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Good knowledge of Matlab. Knowledge of Simulink or Dymola is advantageous.
Knowledge of commercial solvers such as ABAQUS and pre-processor
such as ANSA is advantageous.
Application
We would like you to use the electronic link further down in this ad.
Please apply with: CV, cover letter, grades, and references.
Duration
Proposed the thesis work period
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Estimated start date - 2016-01-18 , Estimated end date - 2016-06-17
ECTS (Academic Credits, Högskolepoäng) 30 ECT
Questions? Please contact:
Sara Caprioli, Ph.D
CAE Brake Performance and NVH
T +46-31-3257133
sara.caprioli@volvocars.com
Application at www.volvocars.com/career