Multi Scale Modelling of Friction Induced Vibrations at the Example of a Disc Brake System

Arn Joerger,Ioannis Spiropoulos,Albert Albers,Robert Dannecker

doi:10.3390/applmech2040060

Arn Joerger, Ioannis Spiropoulos + Show 2 more

Open Access

https://doi.org/10.3390/applmech2040060

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Journal: Applied Mechanics	Publication Date: Dec 10, 2021
Citations: 2	License type: CC BY 4.0

Affiliation: Karlsruhe Institute of Technology

Abstract

Friction induced vibrations such as brake squealing, or juddering are still challenging topics in product engineering processes. So far, this topic was particularly relevant for the automobile industry because they were the main market for disc brake systems. However, since mobility habits change, disc brake system are more often to be found on bikes or e-scooters. In all of these systems, vibrations are excited in contacts on the micro scale but affect the user comfort and safety on the macro scale. Therefore, the aim of this cross-scale method is to analyze a system on a micro scale and to transfer the excitation mechanisms on a macro scale system. To address both scales, the current work presents a finite element model on the micro scale for the determination of the coefficient of friction, which is transferred to the macro scale and used in a multi-body simulation. Finally, a finite element modal analysis is conducted, which allowed us to evaluate the brake system behavior on base of an excitation.

Highlights

Disc brake systems are components of, e.g., trains, cars, trucks, bikes, or e-scooters
The computed excitation signal was implemented in a finite element modal analysis to depict the factor that is relevant to considerations of human comfort: the audible frequency
The FE friction model allows for the purposeful analysis of parameters, such as the velocity, the normal force or the surface roughness

Summary

Introduction

Disc brake systems are components of, e.g., trains, cars, trucks, bikes, or e-scooters. Brake systems must ensure safe working at high speeds; they have to guarantee reliable working on daily loads, such as in front of traffic lights. Because of this high importance of the systems for the safety of the driver and pedestrians, these systems are specially focused on engineering processes. Any strange noise, such as squealing or juddering, unsettles drivers, who mistrust the system. They return the entire vehicle to the dealer, who has to fix the issue. The engineering company has a great interest in the early validation of the product properties in terms of brake systems

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