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Comparing models describing temperature evolution on railway vehicle brake discs with regards to accuracy and computational effort

Kollbye, Asmund Kvam (2020) Comparing models describing temperature evolution on railway vehicle brake discs with regards to accuracy and computational effort. Student thesis. DLR-Interner Bericht. DLR-IB-SR-OP-2020-248, 46 S. (Unpublished)

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Abstract

With more powerful computers, simulations are becoming increasingly important in science and industry. However, a simplified model is sometimes preferred for complex systems, for example when doing system simulations. This report presents four different models for thermal analysis of railway vehicle disc brakes. The models investigated are a lumped capacity model, a friction zone model, and two one-dimensional finite cell models with and without the brake pads. They are developed using Dymola as an environment for the Modelica programming language. Temperature models are fitted using experimental data from a test rig. The experimental data represents three different runs of multiple braking cycles, each with a different braking force. The models are evaluated on experimental data. The accuracy of the mean disc temperatures are evaluated using absolute deviation and integrated squared deviation. The CPU-time is also compared in order to evaluate the computational effort of the models. It is shown both by initial calculations and in the simulations that the lumped capacity assumption is not a valid assumption for this case. The most accurate model with respect to the absolute temperature deviation is the friction zone model, while the most accurate with respect to integrated squared temperature deviation is the friction zone and finite cell models. Including the brake pads into the model showed very limited difference in the brake disc temperature. The friction zone model is found to be the computationally most efficient, using half the CPU-time of the finite cell models.

Item URL in elib:https://elib.dlr.de/140574/
Document Type:Monograph (DLR-Interner Bericht, Student thesis)
Title:Comparing models describing temperature evolution on railway vehicle brake discs with regards to accuracy and computational effort
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kollbye, Asmund KvamAsmund.Kollbye (at) dlr.deUNSPECIFIED
Date:November 2020
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:46
Status:Unpublished
Keywords:Temperature Models, Brake Disc, Railway Brake Systems
Institution:Norwegian University of Science and Technology
Department:Department of Mechanical Engineering
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:other
DLR - Research area:Transport
DLR - Program:V - no assignment
DLR - Research theme (Project):V - no assignment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of System Dynamics and Control
Deposited By: Ehret, Marc
Deposited On:20 Jan 2021 16:23
Last Modified:20 Jan 2021 16:23

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