Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Investigation of Brake Squeal with Contact Stiffness Variation Using Experiment and FE Simulation

패드 접촉강성 변화에 따른 FE스퀼해석법 및 실험 검증

  • Park, Kiwan (Dept. of Mechanical Engineering, Kongju Nat'l Univ.) ;
  • Nam, Jaehyeon (Dept. of Mechanical Engineering, Kongju Nat'l Univ.) ;
  • Kang, Jaeyoung (Dept. of Mechanical Engineering, Kongju Nat'l Univ.)
  • 박기완 (공주대학교 기계자동차공학부) ;
  • 남재현 (공주대학교 기계자동차공학부) ;
  • 강재영 (공주대학교 기계자동차공학부)
  • Received : 2016.07.11
  • Accepted : 2017.02.08
  • Published : 2017.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, squeal noise with respect to pressure variation is measured by a lab-scaled brake dynamometer and estimated by a complex finite element (FE) eigenvalue analysis. From the FE eigenvalue sensitivity analysis, unstable frequencies occur due to a mode-coupling mechanism and are found to change with variation in contact stiffness. In the experiment, squeal frequencies near 1 kHz, 2.5 kHz, 3.5 kHz, and 4 kHz are increased with pressure variation. The sensitivity of squeal modes to contact stiffness variation obtained from the FE analysis is shown to approximate the variation of squeal frequencies under pressure variation in the experiment.

본 논문은 스퀼 시험을 통해 압력 변화에 의해 발생하는 스퀼 소음을 계측하고, 발생된 스퀼 소음을 FEM 복소수 고유치 해석으로 모드연성 불안정성을 구현하였다. FEM 해석에서 압력 변화에 따른 스퀼주파수 변화를 근사하기 위해서 접촉강성 변화에 의한 스퀼 민감도를 예측하고, 잠재적인 스퀼 모드를 유추하였다. 스퀼 실험 결과 1 kHz, 2.5 kHz, 3.5 kHz, 4 kHz 근방에서 스퀼 소음이 발생하였으며, 압력이 증가함에 따라 스퀼 주파수가 다소 증가되었다. FEM 해석 결과 접촉강성 변화에 따른 유사한 스퀼모드 및 민감도를 예측하였고, 해석시 접촉강성 변화가 스퀼실험에서의 압력증가 효과를 근사할 수 있음을 보였다.

Keywords

References

  1. Liu, P., Zheng, H., Cai, C., Wang, YY., Lu, C., Ang, KH. and Liu, GR., 2007, "Analysis of Disc Brake Squeal using the Complex Eigenvalue Method," Applied Acoustics, Vol. 68, No. 6, pp. 603-615. https://doi.org/10.1016/j.apacoust.2006.03.012
  2. Kung, SW., Dunlap, KB. and Ballinger, RS., 2000, "Complex Eigenvalue Analysis for Reducing Low Frequency Brake Squeal," 2000-01-0444, SAE, Warrendale, PA.
  3. Ghazaly, NM., Mohammed, S. and Abd-El-Tawwab, AM., 2012, "Understanding Mode-coupling Mechanism of Brake Squeal Using Finite Element Analysis," International Journal of Engineering Research and Applications, Vol. 2, No. 1, pp. 241-250.
  4. Massi, F., Giannini, O. and Baillet, L., 2006, "Brake Squeal as Dynamic Instability: An Experiment Investigation," The Journal of the Acoustical Society of America, Vol. 120, No. 3, pp. 1388-1399. https://doi.org/10.1121/1.2228745
  5. Nam, J. and Kang, J., 2014, "Investigation of Friction Noise with Respect to Friction Curve by Using FEM and Its Validation," Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 24, No. 1, pp. 28-34. https://doi.org/10.5050/KSNVE.2014.24.1.028
  6. Nam, J. and Kang, J., 2012, " Unstable Brake Pad Mode Due to Friction-velocity Slope," Transactions of the Korean Society for Noise and Vibration Engineering, Vol. s22, No. 12, pp. 1206-1212.
  7. Choi, H., Kang, J. and Gil, H., 2014, "Numerical and Experimental Analysis for Disc Brake Squeal Induced by Caliper Mode," Trans. Korean Soc. Mech. Eng. A, Vol. 38, No. 12, pp. 1351-1358. https://doi.org/10.3795/KSME-A.2014.38.12.1351
  8. Kang, J., Krousgrill, CM. and Sadeghi, F., 2009, "Analytical Formulation of Mode-coupling Instability in Disc-pad Coupled System," International Journal of Mechanical Sciences, Vol. 51, No. 1, pp. 52-63. https://doi.org/10.1016/j.ijmecsci.2008.11.002
  9. Rusli, M. and Okuma, M., 2007, "Effect of Surface Topography on Mode-coupling Model of Dry Contact Sliding Systems," Journal of Sound and Vibration, Vol. 308, No. 3-5, pp. 721-734. https://doi.org/10.1016/j.jsv.2007.03.046
  10. Kang, J., 2014, "Effect of Contact Stiffness on Brake Squeal Analysis Using Analytical FE Squeal Model," Transaction of the KSNVE, Vol. 24, No. 10, pp. 749-755. https://doi.org/10.5050/KSNVE.2014.24.10.749
  11. Nam, J. and Kang, J., 2013, "Brake Squeal Analysis with Respect to Caliper Contact Stiffness," Transactions of the KSNVE, Vol. 23, No. 8, pp. 717-724. https://doi.org/10.5050/KSNVE.2013.23.8.717
  12. Huang, J., Krousgrill, CM. and Bajaj, AK., 2009, "An Efficient Approach to Estimate Critical Value of Friction Coefficient and Sensitivity Analysis for Brake Squeal," International Journal of Vehicle Design, Vol. 51, No. 1-2, pp. 534-541.
  13. Kang, J., 2009, "Linear Stability Analysis of a Rotating Disc Brake for Squeal Noise," Transactions of the KSNVE, Vol. 19, No. 10, pp. 1092-1098. https://doi.org/10.5050/KSNVN.2009.19.10.1092
  14. Vanderlugt, D.N., 2004, "Analytical and Experimental Study of Automotive Disc Brake Squeal Vibration," Master Thesis, Purdue University, pp. 58-72.