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Evaluation of an Energy Dissipation Mechanism by Friction for Brake Shims
Technical Paper
2017-01-2487
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Brake squeal is uncomfortable noise that occurs while braking. It is an important issue for automobile quality to prevent brake products from squealing.
Brake shims are widely used to reduce squeal occurrence rate. In particular, laminated shims can effectively suppress squeal via the viscoelastic damping of an adhesive layer. However, there are cases where the damping performance at low temperature and the durability performance at high temperature deteriorate.
In that regard, we thought of applying frictional damping to shims instead of relying on a temperature-sensitive adhesive layer. To study the application of frictional damping for shims, it is necessary to clarify the characteristics thereof.
In order to quantify the damping performance of shims, loss factor has been generally measured with a bending mode tester. However, the influence of friction cannot be evaluated because it is measured under pressure-free condition. Therefore, we developed a device that can measure damping of shims under pressure and evaluated the basic characteristics of frictional damping. To quantify the frictional damping, the developed method calculates the total energy loss from the area of hysteresis in a cycle of force-displacement oscillation. In addition, the influence of friction on damping is analyzed from the shape of the hysteresis loop.
In this paper, we report the results of comparing laminated shims against textile fabrics, which served as samples for evaluating frictional damping. As a result of measurement by the developed method, it was confirmed that the amplitude and pressure dependency of the laminated shim was small, while on the other hand, the textile fabric has characteristics whereby damping increases with large amplitude and low pressure.
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Kanehira, Y., Aoki, Y., and Nishizawa, Y., "Evaluation of an Energy Dissipation Mechanism by Friction for Brake Shims," SAE Technical Paper 2017-01-2487, 2017, https://doi.org/10.4271/2017-01-2487.Data Sets - Support Documents
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References
- Aoki , Y. , Nishizawa , Y. , Kanehira , Y. Evaluation of Brake Shim Damping under Actual Conditions Euro Brake 2017, 2017-VDT-009 2017
- SAE International Surface Vehicle Recommended Practice Brake Insulator Damping Measurement Procedure SAE Standard J3001 Feb. 2011
- JIS G0602 Test Methods for Vibration-Damping Property in Laminated Damping Steel Sheets of Constrained Type 1993
- Nishizawa , Y. , Wakamatsu , S. , Yanagida , H. and Tamura , Y. Study of Dynamic Pad Stiffness Influencing Brake Squeal SAE Technical Paper 2007-01-3956 2007 10.4271/2007-01-3956
- Oura , Y. , Kurita , Y. , Nishizawa , Y. , and Kosaka , K. Comparison of Pad Stiffness under Static Pressure and Vibration with Small Amplitude SAE Technical Paper 2012-01-1818 2012 10.4271/2012-01-1818
- Aoki , Y. , Nishizawa , Y. , Kurita , Y. , and Oura , Y. Friction Coefficient Variation at Minute Vibrating Velocity between Brake Pad and Disc Rotor SAE Paper, 2013-01-2041 2013 10.4271/2013-01-2041
- Aoki , Y. , Nishizawa , Y. , Kurita , Y. , and Oura , Y. Friction Coefficient Variation at Minute Vibrating Velocity between Brake Pad and Disc Rotor Euro Brake 2014, 2014-ST-001 2014
- Aoki , Y. , Kanehira , Y. , and Nishizawa , Y. Development of Equipment for Evaluating Brake Shim Damping under Actual Conditions SAE Technical Paper 2016-01-1918 2016 10.4271/2016-01-1918