DOI QR코드

DOI QR Code

An Experimental Study on the Squeal Noise Generation due to Dynamic Instability of Brake Pad

브레이크 패드의 동적 불안정성에 따른 스퀼 소음 발생 원인의 실험적 연구

  • 조상운 (상신브레이크 기술연구소) ;
  • 임병덕 (영남대학교 기계공학부)
  • Received : 2016.02.15
  • Accepted : 2016.06.08
  • Published : 2016.09.01

Abstract

Squeal noise is a typical brake noise that is annoying to both passengers and pedestrians. Its frequency range is fairly wide from 1 kHz to 18 kHz, which can be distressful to people. The brake squeal noise occurs due to various mechanisms, such as the mode coupling of the brake system, self-excited vibration, unstable wear, and others. In this study, several parameters involved in the generation of a squeal noise are investigated experimentally by using a brake noise dynamometer. The speed, caliper pressure, torque, and friction coefficient are measured as functions of time on the dynamometer. The contact pressure and temperature distributions of the disc and the pad are also measured by using a thermal imaging camera and a pressure mapping system. As a result of the simultaneous measurement of the friction coefficient and squeal amplitude as functions of the velocity, it is found that the onset of the squeal may be predicted from the ${\mu}-v$ curve. It is also found that a non-uniform contact pressure causes instability and, in turn, a squeal. Based on the analysis results, design modifications of the pad are suggested for improved noise characteristics.

Keywords

References

  1. S. W. Cho, T. H. Jeon, J. S. Jang and S. D. Hwang, "Experimental Study on Occurring to Squeal Noise as per Way of Shim Bonding," KSAE Annual Conference Proceedings, pp.539-540, 2014.
  2. Y. G. Joe, B. G. Cha, H. J. Sim, H. J. Lee and J. E. Oh, "Analysis of Disc Brake Instability due to Friction-Induced Vibration Using a Distributed Parameter Model," Int. J. Automotive Technology, Vol.9, No.2, pp.161-171, 2008. https://doi.org/10.1007/s12239-008-0021-x
  3. B. J. Cho, J. H. Nam and J. Y. Kang, "Squeal Test Using Lab-Scale Brake Dynamometer," KSAE Annual Conference Proceedings, pp.865-868, 2012.
  4. M. Triches Jr, S. N. Y. Gergers and R. Jordan, "Reduction of Squeal Noise from Disc Brake Systems Using Constrained Layer Damping," J. Braz. Soc. Mech. Sci. & Eng., Vol.26, No.3, pp.340-348, 2004.
  5. M. Francesco, L. Baillet and O. Giannini, "Experimental Analysis on Squeal Modal Instability," International Modal Analysis Conference-IMAC-XXIV, 2006.
  6. O. Giannini, A. Akay and Z. Xu, "A Laboratory Brake for the Study of Automotive Brake Noise," Proceedings of IMAC XX, No.373, 2002.
  7. A. M. Rabia, N. M. Ghazaly, M. M. Salem and A. M. Abd-El-Tawwab, "Experimental Studies of Automotive Disc Brake Noise and Vibration: A Review," Int. J. Modern Eng. Res., Vol.3. No.1, pp.199-203, 2013.
  8. H. J. Soh, S. Moon, K. W. Yoon, C. K. Park, J. S. Park and S. Chang, "Brake Squeal Noise Reduction Using Instability Analysis," KSAE Spring Conference Proceedings, pp.2079-2082, 2006.
  9. H. J. Cho, J. H. Lee, J. W. Lee, J. H. Jang and I. D. Kim, "The Effect of Pad Contact Pressure Distribution on Squeal Noise Phenomenon in an Automotive Brake Corner Module," KSAE Annual Conference Proceedings, pp.1398-1404, 2009.
  10. S. S. Kim, K. H. Park and K. S. Park, "Complex Eigenvalue Analysis for Reducing Brake Squeal," KSAE Spring Conference Proceedings, pp.959-964, 2006.
  11. K. Popp and M. Rudolph, "Vibration Control to Avoid Stick-Slip Motion," Journal of Vibration and Control, Vol.10, No.11, pp.1585-1600, 2004. https://doi.org/10.1177/1077546304042026
  12. Disc and Drum Brake Dynamometer Squeal Noise Test Procedure, SAE J 2521, 2013.
  13. Automotive Disc Brake Pad Natural Frequency and Damping Test, SAE J 2598, 2006.
  14. W. T. Jeong, J. M. Park, H. S. Kim and S. W. Cho, "A Study on the Relation between Contact Pressure Distribution and Squeal Propensity," KSAE Spring Conference Proceedings, pp.683-690, 2012.

Cited by

  1. Analysis of Influence of Oil Pan Structure Modification on Radiation Noise of an Engine Using FEM vol.25, pp.5, 2017, https://doi.org/10.7467/KSAE.2017.25.5.573
  2. An Experimental Study on the Effect of Wear Type of Brake Friction Material on the Squeal Noise vol.25, pp.6, 2017, https://doi.org/10.7467/KSAE.2017.25.6.659