Brake squeal as dynamic instability: An experimental investigation

Journal of the Acoustical Society of America

Volumn 120, Issue 3, 2006, Pages 1388-1398

  Massi, Francesco ^a,b   Giannini, Oliviero ^a   Baillet, Laurent ^c  

^a SAPIENZA UNIVERSITY OF ROME   (Italy)

^b UNIVERSITÉ DE LYON   (France)

^c UNIVERSITÉ GRENOBLE ALPES   (France)

Author keywords

[No Author keywords available]

Indexed keywords

BRAKES; CORRELATION THEORY; DAMPING; EIGENVALUES AND EIGENFUNCTIONS; PARAMETER ESTIMATION; PREDICTIVE CONTROL SYSTEMS; VIBRATION CONTROL;

BRAKE SQUEAL; CALIPERS; TRIGGERING MECHANISMS;

FINAL CONTROL DEVICES;

ACCELERATION; APPARATUS; ARTICLE; BRAKE SEQUEAL; EXPERIMENTAL STUDY; FINITE ELEMENT ANALYSIS; FRICTION; NOISE; OSCILLATION; PRIORITY JOURNAL;

EID: 33748562573     PISSN: 00014966     EISSN: None     Source Type: Journal    
DOI: 10.1121/1.2228745     Document Type: Article

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22. The effect of increasing the rotation of the disk is a reduction of the natural frequencies. Lower frequencies can be explained considering that the thin plates holding the support have one end compressed during braking phase. This introduces a lower stiffness in the support substructure to lower frequencies.
23. An extensive description of the modulation of the setup dynamics is reported in the Appendix.
24. During experiments the natural frequencies of the pad and the support are measured by looking at the PSD of the pad acceleration in the tangential direction. In fact, the dynamics of the components already being identified, the PSD allows one to follow the real values of the natural frequencies of the pad and the support in the effective operating state, i.e., during the braking phase. On the contrary, the natural frequencies involving bending vibrations of the disk are measured to the brake under brake application without disk rotation. However, a preliminary test, performed under brake application with disk rotation, assured a negligible effect of the rotation on these modes, which are the only rotor modes involved in squeal in this setup.
25. In Fig. 9 slow, nonphysical decrease of the mean values of the global forces is observed, and it is due to the discharging of the capacitive transducer.
26. Only FRF for 45 N of normal load is plotted for clarity, but no coincidence between the natural frequencies is obtained for different values of the load.
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28. The difference of phase is calculated by performing the FFT of the global normal and friction forces and plotting the difference of the phases at the frequency of squeal, which is the frequency of the dynamic instability.
29. F. Mass, L. Baillet, O. Giannini, and A. Sestieri, "Brake squeal: Linear and nonlinear numerical approaches," Mechanical Systems and Signal Processing (submitted).