This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Modification of Strain Distribution on Contact Surface of Shoe to Reduce Low Frequency Squeals for Brake Disc with Small Holes
Technical Paper
2010-01-1715
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The purpose of this study is to propose an effective model to estimate the excitation force accompanied with stick-slip between shoe and disc, considering the strain distribution on contact surface of the shoe, and then to propose an effective concept to design the brake which reduced the brake squeal under practical use. In order to investigate the influence of configuration of the hole, three types of discs were prepared in which the size of holes was different. The SPL (Sound Pressure Level) and the frequency of squeal for three types of discs were measured when the brake squeal was observed at conditions of low sliding speed. The change of stability of the brake shoe passing on hole was analyzed by 2-D simplified brake system model. In order to investigate how the strain distribution of the shoe affected on the excitation force caused by stick-slip, FE (Finite-element) and FDTD (Finite-difference time-domain) analysis were utilized to simulate the elastic wave propagation in the shoe under braking. Test result showed that the SPL of the brake squeal was reduced at significant peak of SPL around 700Hz when the disc had large diameter holes on the frictional surface. The stability analysis also showed that the stable region was extended when large hole was opened on the disc. The excitation force estimated by FE and FDTD model of the shoe was reduced when the diameter holes was increased. These results indicated that the excitation force at brake squeal was prevented by the modification of strain distribution. Such discussion was experimentally confirmed by the bench test with modified shoes which had concentrated strain distribution. This paper proposed an effective concept to prevent the squeal of the brake disc for motorcycles.
Authors
Citation
Obunai, K., Hagiwara, S., Okubo, K., Fujii, T. et al., "Modification of Strain Distribution on Contact Surface of Shoe to Reduce Low Frequency Squeals for Brake Disc with Small Holes," SAE Technical Paper 2010-01-1715, 2010, https://doi.org/10.4271/2010-01-1715.Also In
References
- Yuasa, H. Okubo, K. Fujii, T. Nakatsuji, T. “Prediction of Crack Initiation for One-Piece Type Brake Disc for Motorcycles Under Overload Condition,” SAE Technical Paper 2005-32-0047 2005 10.4271/2005-32-0047
- Obunai, K. Okubo, K. Fujii, T. Nakatsuji, T. “Study on Low Speed Judder of Wave Type Brake Discs for Motorcycles,” SAE Technical Paper 2006-32-0026 2006 10.4271/2006-32-0026
- Koyama, Y. Okubo, K. Fujii, T. Nakatsuji, T. “Effect of Residual Stress on Crack Initiation from Tiny Holes of Brake Disc for Motorcycles,” SAE Technical Paper 2007-01-3952 2007 10.4271/2007-01-3952
- Obunai, K. Okubo, K. Fujii, T. Nakatsuji, T. “Characterization of Brake Torque Variation of Wave Type Brake Disc for Motorcycles,” SAE Technical Paper 2009-01-3023 2009 10.4271/2009-01-3023
- Dunlap, K.B. Riehle, M.A. Longhouse, R.E. “An Investigative Overview of Automotive Disc Brake Noise,” SAE Technical Paper 1999-01-0142 1999 10.4271/1999-01-0142
- Denou, Y. Nishiwaki, M. “First Order Analysis of Low Frequency Disc Brake Squeal,” SAE Technical Paper 2001-01-3136 2001 10.4271/2001-01-3136
- Ouyang, H. Mottershead, J. E. Li, W. A Moving-Load Model for Disc-Brake Stability Analysis Journal of Vibration and Acoustics 125 53 58 2003
- Baillet, L. Linck, V. D'Errico, S. Laulagnet, B. Berthier, Y. Finite Element Simulation of Dynamic Instabilities in Frictional Sliding Contact Transactions of the ASME 127 652 657 2005
- Hetzeler, H. Seemann, W. Friction Induced Brake Vibrations at Low Speeds -Experiments, State-Space Reconstruction and Implications on Modeling Proceedings of IMECE2006 283 292 2006
- Hochlenert, D. Korspeter, G. S. Hagedorn, P. Friction Induced Vibrations in Moving Continua and Their Application to Brake Squeal Transactions of the ASME 74 542 549 2007
- Kang, J. Krousgrill, C. M. Sadeghi, F. Comprehensive Stability Analysis of Disc Brake Vibrations including Gyroscopic, Negatice Friction Slope and Mode-Coupling Mechanisms Journal of Sound and Vibration 324 387 407 2009
- Lee, L. Gesch, E. “Discussions on Squeal Triggering Mechanisms - A Look beyond Structural Stability,” SAE Technical Paper 2009-01-3012 2009 10.4271/2009-01-3012
- Hagiwara, S. Obunai, K. Okubo, K. Fujii, T. Nakatsuji, T. Effect of Diameter of Holes Opened on Frictional Surface of Brake Disc on Reduction of Squeal and stick-slip at Braking Proceedings of The 15th Asia Pacific Automotive Engineering Conference 2009
- Taflove, A. Hagness, S.C. Computational Electrodynamics: The Finite-Difference Time-Domain Method second Artech House Boston 2000
- Sato, M. Takahata, Y. Tahara, M. Sakagami, I. Expression of Acoustic Fields in Solids by Scalar and Vector Velocity Potentials Proceedings of IEEE Ultrasonic Symposium 2001 2001