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Damping effect on nonlinear drum brake squeal prediction

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Abstract

In the present study, Complex Eigenvalue Analysis (CEA) was used for predicting squeal noise generation in a commercial drum brake. By using a CEA model, Rayleigh damping properties were added to the computer simulation on ANSYS, and a discussion about its implications and proposed calculations are also shown. The Rayleigh damping coefficients (α and β) were obtained through impact tests carried out in a commercial drum brake. Three different cases of damping levels were simulated: (a) Undamped condition, (b) Damped–0 bar, and (c) Damped–2 bar. Results of experimental tests showed that increasing brake pressure from 0 to 2 bar in the damped condition leads to a shift in the resonant frequencies towards higher values, as well as to increase the damping response of the drum brake system. Results of CEA showed a large number of vibration modes occurred within a narrow range of frequencies (0–4500 Hz). This means the drum brake is prone to modal coupling, which may lead to noise generation. The first model simulated by CEA (undamped case) showed five instabilities in the frequency range considered, from this point, the second model was built (damped–0 bar case) and only three instabilities were identified. Thus, the third model (damped–2 bar case) was analyzed and it showed only one unstable frequency, which means over-predictions could be avoided due to the addition of damping. Thus, it was noticed a significant negative offset caused by the damping effect, however, the system instabilities for all five modes remain. CEA models were validated by comparison of predicted and vehicle noise frequencies, which were very close.

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Acknowledgements

The authors acknowledge the financial support of CNPq and CAPES, Brazil.

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Authors and Affiliations

  1. Federal University of Rio Grande Do Sul, PROMEC, Sarmento Leite street, 425, Porto Alegre, 90050-170, Brazil

    D. S. Antunes, N. F. Ferreira, P. D. Neis & Letícia F. F. Miguel

  2. Laboratory of Tribology, Universidade Federal Do Rio Grande Do Sul, Sarmento Leite, 425, Porto Alegre, 90050-170, Brazil

    N. F. Ferreira & P. D. Neis

  3. University of Caxias Do Sul, Francisco Getúlio Vargas street, 1130, Caxias Do Sul, 95070-560, Brazil

    D. Masotti & J. Favero

  4. Fras-Le S.A., Rod RS-122, 10945 – km 66, Caxias Do Sul, 95055-010, Brazil

    D. S. Antunes, D. Masotti & J. Favero

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  1. D. S. Antunes
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Correspondence to D. S. Antunes.

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Technical Editor: Samuel da Silva.

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Antunes, D.S., Masotti, D., Ferreira, N.F. et al. Damping effect on nonlinear drum brake squeal prediction. J Braz. Soc. Mech. Sci. Eng. 44, 97 (2022). https://doi.org/10.1007/s40430-022-03398-x

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