CONSIDERATIONS ON THE VEHICLE FLOOR CARPET VIBRO-ACOUSTIC MODELLING

Iulian LUPEA, Adrian COROIAN

Abstract


In the present paper the carpet structure covering the firewall area of a vehicle is observed during the firewall vibration. The carpet structure is modelled as a vibrating spring-mass-damper system excited from the firewall which is in contact with the foam layer. The rest of the layers toward the habitacle interior are modelled as the mass of the system. By exciting carpet samples on the dynamic shaker the foam dynamic parameters and the first resonance of the carpet system are determined from the standpoint of the vibration transmitted from the firewall to the habitacle. This frequency is perceived like a weak point of the acoustic carpet insulation and has to be carefully managed when considering the vibration spectra coming from the engine and the power train.

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References


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