, Volume 49, Issue 4, pp 1011–1021 | Cite as

Motorcycle brake squeal: experimental and numerical investigation on a case study

  • Marco Dezi
  • Paola Forte
  • Francesco Frendo


Since, nowadays, the NVH performance of a vehicle is one of the most important priorities for the market, the noise radiating from disc brakes is considered a source of considerable discomfort and customer dissatisfaction. Squeal is an example of noise, caused by vibrations induced by friction forces, in which the vibration modes of the brake disc are coupled to those of the friction pads or of the caliper. In this work a case study, in which the squeal phenomenon was detected after changing the supplier of the disc pads, is presented. A test bench was purposely developed to investigate the squeal phenomenon; tests at different rotating speeds and pressures in the brake circuit were carried out employing different friction pads. The experimental apparatus appeared capable of reproducing the phenomenon observed in real practice and to investigate the effect of operating parameters and different components on the onset of instability. Friction tests and geometric analysis of the friction pads were also carried out to complete the investigation. At the same time, a finite element (FE) complex eigenvalue parametric analysis was performed on the brake assembly. The different propensity of the pads to squeal was attributed to differences in their geometry and in their friction coefficients. The FE analysis, confirmed the experimental observations and indicated possible design improvements to increase the stability of the system.


Disc brake Noise Squeal Motorcycle Experimental analysis Finite elements Complex modal analysis 



The authors acknowledge the technical support and collaboration of Piaggio as regards the tests carried out on the instrumented vehicle and the technical support of Mr. Dario Mondini as regards the characterization tests carried out on the pads.


  1. 1.
    Kinkaid NM, O’Reilly OM, Papadopoulos P (2003) Automotive disc brake squeal: a review. J Sound Vib 267(1):105–166 ADSCrossRefGoogle Scholar
  2. 2.
    Ouyang H, Nack W, Yuan Y, Chen F (2005) Numerical analysis of automotive disc brake squeal: a review. Int J Vehicle Noise Vibr 1(3/4):207–231 CrossRefGoogle Scholar
  3. 3.
    North MR (1972) A mechanism of disc brake squeal. In: Proc of 14th int automobile technical congress of FISITA, pp 1/9–1/15 Google Scholar
  4. 4.
    Millner N (1978) An analysis of disc brake squeal. SAE technical paper 780332 Google Scholar
  5. 5.
    Chowdhary HV, Bajaj AK, Krousgrill CM (2001) An analytical approach to model disc brake system for squeal prediction. In: Proc of DETC’01/VIB21560. ASME, Pittsburg, PA, pp 1–10 Google Scholar
  6. 6.
    Watany M, Abouel-Seoud S, Saad A, Abdel-Gawad I (1999) Brake squeal generation. SAE technical paper 1999-01-1735 Google Scholar
  7. 7.
    El-Butch AM, Ibrahim IM (1999) Modelling and analysis of geometrically induced vibration in disc brakes considering contact parameters. SAE technical paper 1999-01-0143 Google Scholar
  8. 8.
    AbuBakar AR, Ouyang H (2006) Complex eigenvalue analysis and dynamic transient. Int J Vehicle Noise Vibr 2:143–155 CrossRefGoogle Scholar
  9. 9.
    Liu P et al. (2007) Analysis of disc brake squeal using the complex eigenvalue method. Appl Acoust 68:603–615 CrossRefGoogle Scholar
  10. 10.
    Triches MJ, Gerges SNY, Jordan R (2008) Analysis of brake squeal noise using the finite element method: a parametric study. Appl Acoust 69:147–162 CrossRefGoogle Scholar
  11. 11.
    Massi F, Baillet L, Giannini O, Sestieri A (2007) Brake squeal: linear and nonlinear numerical approaches. Mech Syst Signal Process 21:2374–2393 ADSCrossRefGoogle Scholar
  12. 12.
    Carmignani C, Forte P, Rustighi E (2006) Experimental simulation of the sharpening process of a disc blade and analysis of its dynamic response. J Sound Vib 297:649–663 ADSCrossRefGoogle Scholar
  13. 13.
    Giangreco D, Virzì Mariotti G (2006) Studio termomeccanico di un freno a tamburo per veicoli pesanti. Paper presented at XXXV CONGRESSO AIAS, Ancona, paper no 8: pp 1–10 Google Scholar
  14. 14.
    Hebbes M (2012) Breakthrough in brake squeal prediction helps to eliminate noise problems early in design process. White paper, ANSYS Resource Library, pp 1–6 Google Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Dipartimento di Ingegneria Civile e IndustrialeUniversità di PisaPisaItaly

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