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Abstract:The experimental analysis of a single component of a brake system and an assembly consisting of three components is used to clarify the relevance of joints in terms of damping and nonlinearity in state-of-the-art brake systems. For this purpose a series of experimental modal analyses is conducted. A comparison of the results obtained from the single component and of the assembly strongly indicate that the joints which necessarily exist in an assembled structure have an impact on the dynamic behaviour of the structure. The modal damping values of the jointed structure are up to factor sixty higher than those of the single component values. Also, a significant amplitude dependency of the frequency response functions is visible. These observations demonstrate that joints are a major source of energy dissipation in friction brake systems and, in addition, that they introduce nonlinear behaviour to the system which has the potential to limit squeal amplitudes. Therefore, mechanical joints in brake systems should be considered as decisive design elements for noise-vibrationharshness (NVH) issues in brakes.http://mc.manuscriptcentral.com/jauto 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 F o r P e e r R e v i e w brake systems and, in addition, that they introduce nonlinear behaviour to the system which has the potential to limit squeal amplitudes. Therefore, mechanical joints in brake systems should be considered as decisive design elements for noise-vibration-harshness (NVH) issues in brakes.

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This work demonstrates preliminary results on energy harvesting from a linearly stable fluttertype system with circulatory friction forces. Harmonic external forcing is applied to study the energy flow in the steady sliding configuration. In certain parameter ranges negative excitation work is observed where the external forcing allows to pull part of the friction energy out of the system and thus makes energy harvesting possible. Studies reveal that this behavior is largely independent of the flutter point and thus that it is primarily controlled by the excitation. Contrary to existing energy harvesting approaches for such systems, this approach uses external forcing in the linearly stable regime of the oscillator which allows to control vibrations and harvest energy on demand.

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