This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Friction Coefficient Variation at Minute Vibrating Velocity between Brake Pad and Disc Rotor
Technical Paper
2013-01-2041
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Brake squeal is uncomfortable noise that occurs while braking. So, it is an important issue of automobile quality to reduce the brake squeal occurrence. Although many researchers had reported about brake squeal, there are many examples that have not been understood well.
For those squeals, some of occurrence mechanisms are assumed. The dµ/dv<0 theory is one of them, and the dµ/dv represents a slope of friction coefficient for sliding velocity. If the frictional force has a negative damping characteristic, that is dµ/dv<0, disc vibration may increase. It has been said for a long time that a negative dµ/dv characteristic affects brake squeal occurrence.
Many researchers had measured the dµ/dv to clarify brake squeal factors. In those results, the slope of friction coefficient at steady sliding speed was used for the dµ/dv. However, the pad undergoes minute vibrations while the brake is squealing. So, we developed a device that can measure the friction coefficient with minute vibrating velocity. A piezo-actuator and a dynamic load sensor are used to measure the friction coefficient at minute vibrating velocity.
The results say that dµ/dv at the minute vibrating velocity differs from that at the steady sliding speed. And, the results also showed that dµ/dv at the minute vibrating velocity tended to increase for actuating frequency, and tended to slightly decrease for thrust load.
Recommended Content
| Technical Paper | Influence of Distributed Stiffness in Contact Surface on Disk Brake Squeal |
Authors
Topic
Citation
Aoki, Y., Nishizawa, Y., Kurita, Y., and Oura, Y., "Friction Coefficient Variation at Minute Vibrating Velocity between Brake Pad and Disc Rotor," SAE Technical Paper 2013-01-2041, 2013, https://doi.org/10.4271/2013-01-2041.Also In
References
- Millner , N. An Analysis of Disc Brake Squeal SAE Technical Paper 780332 1978 10.4271/780332
- Murakami , H. , Tsunada , N. , and Kitamura , T. A Study Concerned with a Mechanism of Disc-Brake Squeal SAE Technical Paper 841233 1984 10.4271/841233
- Nishizawa , Y. , Wakamatsu , S. , Yanagida , H. , and Takahara , Y. Study of Dynamic Pad Stiffness Influencing Brake Squeal SAE Technical Paper 2007-01-3956 2007 10.4271/2007-01-3956
- Ostermeyer , G. On Tangential Friction Induced Vibrations in Brake Systems SAE Int. J. Passeng. Cars - Mech. Syst. 1 1 1251 1257 2008 10.4271/2008-01-2580
- Inoue , M. Studies on Friction Materials of Automobile (1 st Report, Squeal of Disk Brake Pad) Transactions of the Japan Society of Mechanical Engineers, Series C 51 466 1433 1439 1985
- Kung , S. , Stelzer , G. , Belsky , V. , and Bajer , A. Brake Squeal Analysis Incorporating Contact Conditions and Other Nonlinear Effects SAE Technical Paper 2003-01-3343 2003 10.4271/2003-01-3343
- Nagasawa , Y. Analysis of Brake Squeal TOYOTA CENTRAL R&D LABS Review 28 1 43 51 1993
- Wang , S. and Woodhouse , J. A Novel Measurement of Dynamic Friction SAE Int. J. Passeng. Cars - Mech. Syst. 1 1 1172 1180 2008 10.4271/2008-01-2536