The design of dry-running friction pairings and systems determines not only their installation space and costs, but also their reliability under critical load conditions, for example in emergencies, in the case of faults, and in the event of misuse. While knowledge of the contact pattern is highly important for the development of clutches and brakes, the contact-related measurement of the temperature of these systems has not yet been solved in a satisfactory manner. Despite its importance, the temperature distribution has only been measured in a few studies. Typically, temperature measurements of complete clutches and brakes are carried out using thermocouples only. In this study, a new innovative test setup is presented. This setup is able to measure the heat distribution of the lining and the steel disk of a brake with high spatial resolution by means of fiber optic sensing technology and thermography. As a novelty, it enables measurement of the heat distribution and allows to correlate it with the fade and recovery behavior. Contrary to the expectations, the contact pattern is heterogeneous in circumferential direction. Possible causes are discussed using simulation results. Along with surface analysis, the new setup contributes to the investigation of the causes of fade and recovery.
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The authors thank for the support of the research project. The project 19377-N of the Research Association for Drive Technology is funded as part of the program for the promotion of industrial community research by the Federal Ministry for Economic Affairs and Energy on the basis of a decision by the German Bundestag.
Albert ALBERS. He is a professor and head of IPEK-Institute for Product Engineering at Karlsruhe Institute of Technology (KIT), received his Ph.D. degree in mechanical engineering from Leibniz University Hannover, Germany, in 1987. Before he started his position in Karlsruhe, he served as head of the Development Department and as deputy member of the executive board of a manufacturer of bearings, clutches, and gearboxes. His fundamental research philosophy is the simultaneous research on methods and processes of product engineering combined with the research on synthesis and validation of new technical systems whilst taking into account the significant role of the engineer within the product development process. He and his team investigate methods to analyze future market requirements and the innovation process of new product generations in the following research areas: Drive systems and mobility, clutches and brakes in drive systems, systems tribology, validation and NVH of technical systems, development and innovation management, and lightweight design and competence-oriented teaching methods.
Thomas KLOTZ. He is a research assistant at IPEK-Institute for Product Engineering at KIT, received his master degree in mechanical engineering from KIT, Germany, in 2016. Since then, he has been working in IPEK’s research group Clutches and Tribological Systems. His research interests include the tribology and NVH of dry-running clutches and brakes, in particular the development of new test methods and setups for the investigation of fade and recovery.
Chris FINK. He is a student research assistant at IPEK-Institute for Product Engineering at KIT, received his bachelor degree in mechanical engineering from KIT, Germany, in 2018. Following on from his bachelor’s thesis investigating the fade and recovery behaviour of dry-running friction systems, he joined the research group Clutches and Tribological Systems at IPEK. His field of activity includes the software implementation and experimental setup of the fiberoptic sensor.
Sascha OTT. He is a managing director of IPEK-Institute for Product Engineering at KIT and the KIT Center of Mobility Systems, obtained his degree in mechanical engineering from University of Karlsruhe, Germany, in 2002. Beside of his current position, he serves as the head of the research fields clutches and brakes in drive systems and guides among others the research activities in the fields of drive systems, systems tribology, and validation of technical systems.
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Albers, A., Klotz, T., Fink, C. et al. Investigation of the heat distribution in dry friction systems during fade and recovery using fiber-optic sensing and infrared technology. Friction (2021). https://doi.org/10.1007/s40544-021-0506-4
- dry-running clutch and brake
- fade and recovery
- high-resolution spatial temperature distribution measurement