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The Influence of Differential Pad Wear on Low-Frequency and High-Frequency Brake Squeal
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 15, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
The NVH behavior of disc brakes in particular, is in the focus of research since a long time. Measurements at a chassis dynamometer show that brake pad wear has a significant influence on the occurrence of low- and high-frequency squealing . It is suspected that high-frequency squealing is more likely to occur when the wear difference between the inner and outer brake pad is small. In the other case, if the differential wear rate between the inner and outer pads becomes higher, the prevalence of low-frequency squealing increases.
In order to examine this hypothesis, this work focuses on a simplified model of a commercial brake system . In a first step, the inner pad’s wear is iteratively increased, while the wear on the outer pad remains unaffected. In a second step, the coefficient of friction at the worn pad is iteratively increased to investigate the influence on the low and high-frequency squealing. With the aid of the Complex Eigenvalue Analysis (CEA), the real part of the eigenvalue is used as a quantification measure in order to investigate the dependence between wear and high and low frequency squealing.
|Technical Paper||On Automotive Disc Brake Squeal Part III Test and Evaluation|
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CitationOtto, J., Ostermeyer, G., and Rhee, S., "The Influence of Differential Pad Wear on Low-Frequency and High-Frequency Brake Squeal," SAE Technical Paper 2019-01-2130, 2019, https://doi.org/10.4271/2019-01-2130.
Data Sets - Support Documents
|[Unnamed Dataset 1]|
- Lee, S., Jeon, J., Kim, S., Kim, S. et al. , “A Study of Low-Frequency and High-Frequency Disc Brake Squeal,” SAE Int. J. Passeng. Cars - Mech. Syst. 9(3):1235-1244, 2016, doi:10.4271/2016-01-1944.
- Ostermeyer, G., Otto, J., and Rhee, S. , “In-Plane and Out-of-Plane Vibrations of Brake Linings on the Rotor,” SAE Technical Paper 2017-01-2530, 2017, doi:10.4271/2017-01-2530.
- Lee, S., Jeon, J., Jeong, J., Park, B. et al. , “Disc Brake Squeal vs. Disc Pad Compressibility-Caliper Stiffness Interactions: Low-Frequency Squeal and High-Frequency Squeal vs. Differential Pad Wear,” SAE Technical Paper 2017-01-2528, 2017, doi:10.4271/2017-01-2528.
- SAE International Surface Vehicle Recommended Practice , “Automotive Brake Noise and Vibration Standard,” SAE Standard J2786, 2009.
- Otto, J., Ostermeyer, G., and Rhee, S. , “On the Wear Dependence of Low-Frequency and High-Frequency Brake Squeal,” SAE Technical Paper 2018-01-1902, 2018, doi:10.4271/2018-01-1902.
- Lee, S., Jeon, J., Kim, S., Kim, S. et al. , “Brake Squeal and Disc Metallurgy Variability: Importance of Disc Wear,” SAE Technical Paper 2014-01-2491, 2014, doi:10.4271/2014-01-02491.
- Park, C., Han, M., Cho, S., Choi, H. et al., “A Study on the Reduction of Disc Brake Squeal Using Complex Eigenvalue Analysis”, SAE Technical Paper 2001-01-3141, doi:10.4271/2001-01-0141.