18-20 June, 2003, Budapest, Hungary OSSKI Center (Törley Palace) | 
with Exhibition and Pre-Session on Thermal Energy in Hungarian
"THERMO-BRIDGE"
between East and West for technology transfer and
information exchange
| Scientific Society of
Measurement, Automation and Informatics (MATE)
Branch of Thermal Engineering and Thermogrammetry (TE and TGM)
Méréstechnikai, Automatizálási és
Informatikai Tudományos Egyesület
Hőtechnikai és Termogrammetriai (HT és TGM) Szakosztály
MATE Secretariat: H-1372 Budapest, POB. 451.,Hungary
House of Technology, Budapest
V.,Kossuth Lajos tér 6-8.III.318.
Phone: +361-332-9571, Fax:+361-353-1406
E-mail: mate@mtesz.hu benko@energia.bme.hu |
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Infrared imagery and
analysis/ Infravörös képalkotás és képfeldolgozás |
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8/6 |
Infrared characterization on thermal gradients on disc brakes
S. Panier1, Ph. Dufrénoy2,
P. Brémond3
1Ecole des Mines de Douai; 2Ecole Polytechnique Univ. de
Lille, Villeneuve d’Ascq; 3CEDIP Infrared Systems, Croissy
Beaubourg, France |
S1I07 |
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The heat generated in
frictional organs like brakes and clutches induces thermal
distortions which may lead to localized contact areas and hot
spots developments. Hot spots are high thermal gradients on the
rubbing surface. They count among the most dangerous phenomena in
frictional organs leading to damage, early failure and
unacceptable braking performances such as brake fade or undesirable
low frequency vibrations called hot judder.
In this paper, an experimental study of hot spots occurrence in
railway disc brakes is reported on. The aim of this study was to better classify and to explain
the thermal gradients appearance on the surface of the disc.
Thermograph measurements with an infrared camera have been carried
out on the rubbing surface of brake discs on a full-scale test
bench. The infrared system was set to take temperature readings
in snap shot mode precisely synchronized with the rotation of
the disc. Very short integration time allows reducing drastically
haziness of thermal images. Based on thermographs, a classification
of hot-spots observed in disc brakes is proposed. A detailed
investigation of the most damaging thermal gradients, called macroscopic hot spots (MHS)
is given. From these experimental
researches, a scenario of hot spots occurrence is suggested
step by step. Thanks to infrared measurements at high frequency
with high resolution, observations give new highlights
on the conditions of hot spots appearance. Comparison of the
experimental observations with the theoretical approaches is finally discussed.
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Contact details:
Stéphane Panier
941 rue Charles Bourseul, BP 838
59508 Douai Cedex, France
Tel: +33 (0)3 27 71 23 30
Fax: +33 (0)3 27 71 29 18
E-mail: panier@ensm-douai.fr
Web Site:
www.ensm-douai.fr |
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| 18-20 June, 2003, Budapest,Hungary |
OSSKI
Center (Törley Palace)
"Fodor
József" National Center of Public Heath
"Frédéric Joliot-Curie"
National Research Institute for
Radiobiology and Radiohygiene. (OKK-OSSKI)
www.osski.hu |
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