Thermal camera helps optimise TGV braking
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Cedip Infrared Systems product story
Edited by the Engineeringtalk editorial team
Sep 10, 2004
The high-performance Jade MM-IR camera has been used as part of a study to characterise suitable brake disk materials for the French TGV high-speed train.
Cedip Infrared Systems has completed a study in conjunction with CNRS-EUDIL (Lille, France) describing the use of the high-performance Jade MW-IR camera to characterise suitable brake disk materials for the French TGV high-speed train.
The goal of these tests was to determine the temperature distribution at the surface of the disk during the breaking phase and also to determine the performance of various materials cladding configuration that are used as disk materials.
When the TGV train has to brake from full speed to full stop the dissipated energy is close to 15MJ, resulting in the induction of high temperatures at surface of the brake disk.
The materials for brake disks must be designed to efficiently dissipate this huge amount of heat.
Measurement of the temperature distribution at the disk surface was essential to validate the design of the material cladding that constitutes the disk surface.
In order to be representative of the heat dissipation, the temperature measurement must be made while the disk is spinning and during the braking phase.
A Jade MWIR camera operating in 3-5um waveband was used to measure the temperature distribution at a 200Hz frame rate.
In order to freeze the motion per each frame the integration time was reduced to 10us.
As the Jade cameras used incorporate high-quantum-efficiency infra-red focal plane arrays, they maintained the required high sensitivity even under these demanding conditions.
The brake disks under test were mounted into an experimental setup designed to reproduce the speed and location encountered during the braking phase.
The camera was mounted to observe approximately half of the disk surface.
The results obtained have permitted CNRS-EUDIL to determine the most appropriate type of brake cladding both in terms of shape and type of materials used.
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