400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-0790 Web: www.sae.org SAE TECHNICAL PAPER SERIES 2007-01-3935 Investigation of the Thermal Vehicle Brake Behavior During the Vehicle’s Development Phase by Co-Simulation A. Tonchev and W. Hirschberg Graz University of Technology S. Jagsch Magna Steyr Fahrzeugtechnik Graz 25th Annual Brake Colloquium & Exhibition Orlando, Florida October 7-10, 2007Downloaded from SAE International by Big Ten Academic Alliance, Tuesday, July 31, 2018The Engineering Meetings Board has approved this paper for publication. It has successfully completed SAE's peer review process under th e supervision of the session organi zer. This process requires a minimum of three (3) reviews by industry experts. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. For permission and licensing requests contact: SAE Permissions 400 Commonwealth DriveWarrendale, PA 15096-0001-USAEmail: [email protected]: 724-772-4028 Fax: 724-776-3036 For multiple print copies contact: SAE Customer Service Tel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (outside USA)Fax: 724-776-0790Email: [email protected] ISSN 0148-7191 Copyright  2007 SAE International Positions and opinions advanced in this paper are those of the author(s ) and not necessarily those of SAE. The author is solely responsible for the content of th e paper. A process is available by which discussions will be printed with the pap er if it is publishe d in SAE Transactions. Persons wishing to submit papers to be considered for presentation or publicat ion by SAE should send the manuscript or a 300 word abstract to Secretary, Engineering Meetings Board, SAE. Printed in USADownloaded from SAE International by Big Ten Academic Alliance, Tuesday, July 31, 20181ABSTRACT The mathematical thermal design of the vehicle brakes will lead to success if all influence parameters such as friction (fading effect), car geometry and inertia, brake amplifier, tire, convective heat flow, heat conductance and heat radiation are taken into consideration. In addition to a lot of design criteria, the thermal stability of the vehicle brake is becoming more and more important because of permanently increasing engine powers and weight of the vehicles. This requires both stable friction behavior in the contact zone between brake lining and brake disk and a sufficient transfer of the friction energy by means of convective heat flow. In order to accomplish these two tasks, considerable expense on a brake test bed and innumerable brake trials are necessary. It must be guarantied at the end of the brake design process that the vehicle reaches the required braking distance and the thermal stability of the brake, e.g. after several freeway braking sequences. In spite of all extensions, there is no closed simulation model known applicable for practice until today, that both fading effect and self-induced vibrations (NVH) of the brake can be modeled satisfactorily as a part of the vehicle. A combined procedure for simulating of the performance of automotive disk brakes is presented in the present work. The introduced software interface between MATLAB and ANSYS can guarantee the automatic co-simulation. This includes not only the non-steady state temperature distribution and the fading behavior due to several vehicle brakes simultaneously, but also several braking procedures sequentially. Additionally, the theoretical background and the practical appliance of a 3D FEM-simulation of the non-steady state brake thermal behavior in MATLAB is introduced. A new approach for measuring of the friction is also presented. This approach can be used as an input for a dynamic brake vehicle co-simulation. An intelligent concept for model