The Effectiveness of the Suppression of Low Frequency Acoustic Resonances with Porous Sound Absorbing Structures of Multifunctional Upholstery Materials of Car Body Interior

Abstract

The article presents the results of researches on the effectiveness of the technical method of suppression of low frequency acoustic resonances occurring in the air volumes of passenger and luggage areas of the car body by increasing the absorption degree of sound wave energy by multifunctional panel and volumetric elements of a car body interior. The research reviews a sliding shutter and integral carpeting of a luggage compartment, rear wheel arch trim, backrest upholstery and car door trim as the modified multi-functional elements of the car body interior. The results of experimental researches show that putting the modified multifunctional car body interior upholstery, characterized by high sound absorbing properties, into the studied prototype of a car allows to reach the effect of reduction the overall sound levels up to 9 dBA on the mode of intensive acceleration movement and sound pressure levels, which are registered at a frequency of the second motor harmonic of the engine 2n / 60 - 16 dB.