Numeric and experimental study on several rattle noises from a generic system
Résumé
Rattle noises encountered in automotive systems such as seats or front panels are gaining more and more importance in the automotive industry. Recent progresses in noise reduction combined with the emergence of new electrical/hybrid vehicle and the need of mass reduction has emphasized the appearance of this new class of noise which was masked in the past. \\ Rattle noises are here studied using a vibro-impacting system under forced excitation. An experimental set-up composed of a beam impacting a barrier has been designed in order to reproduce this phenomenon. Periodic and apparent chaotic rattles are occurring at various combinations of environmental parameters such as: excitation frequency, initial presence of clearance or pre-load, contact stiffness and damping. Simulated bifurcation diagrams are also obtained representing the overall behaviour of the vibro- impacting system and are then compared with experiments.
Domaines
Acoustique [physics.class-ph]
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