Automotive friction-induced noises
Résumé
Friction-induced noises are numerous in the automotive field. They also involve a large number of structures. Wiper squeal, seat squeak or dashboard creak are some examples of these noises. The different names traditionally used to describe these noises allow a first classification, especially based on their acoustic signature. From an experimental side, an exploratory test-rig has been designed. This can generate friction-induced noises with simple structures and automotive materials. Qualitative sensitivity studies have demonstrated the test-rig ability to produce squealing, squeaking and creaking noises. From a numerical side, a 3-degrees-of-freedom model has been studied. This model brings together the main physical concepts (stick-slip, sprag-slip, modal coupling) explaining the origin of friction induced noise. Calculations of complex eigenvalues carried out on this linearized model permit to highlight the concept of modal coupling instability. The extreme sensitivity of the vibrational behavior and a fortiori radiated noise towards conception parameters explains why these noises seem to appear randomly. Temporal simulations, in turn, permit to highlight the concepts of modal coupling, stick-slip and sprag- slip. They also permit to obtain qualitatively the vibrational behavior at the origin of the squealing, squeaking and creaking noises.
Domaines
Acoustique [physics.class-ph]
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