A Development Procedure to Improve the Acoustical Performance of a Dash System

Saha, Pranab; Jain, Dhaval B.; Linke, J.M.

doi:10.4271/2005-01-2515

Cited by 3 publications

(1 citation statement)

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“…Layer A is usually made of porous fiber materials and is mainly used to absorb sound, layer B is usually made of PE film and is used to insulate sound. [1][2][3] Acoustics performances of an Absorber-Barrier-Absorber (ABA) structure are determined by the sound absorption layer A that is to consume sound transmitted energy and the sound insulation layer B that is used to barrier sound transmission to reduce cabin noise. Therefore, the Sound Absorption Coefficient (SAC) of layer A and the Sound Transmission Loss (STL) of ABA structure are important performance indexes of ABA structures.…”

Section: Introductionmentioning

confidence: 99%

Sound transmission loss of absorber-barrier-absorber structures with kapok fibers as absorption layers

Xie

Yang

Kang

et al. 2023

Journal of Industrial Textiles

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The sound insulation of the front wall of a car is mainly used to isolate the noise of the engine from being transmitted to the passenger cabin. A front wall is generally a kind of structure of Absorber-Barrier-Absorber (ABA), where A is sound absorption layer and B is sound insulation layer. The sound absorption layer (A) usually consists of porous cotton of superfine fiber or microfiber. In this paper, kapok fiber is used to make the sound-absorbing layer A, and its sound absorption is compared with that of superfine fiber. Microstructure of the two fibers is compared, and it is found that kapok fiber has a large hollow structure. The sound absorbing coefficients of the layer A made with the two fibers are measured and it is concluded that the layer A made of kapok fibers can absorber noise greatly and thus has high sound absorption coefficient. The prototypes of ABA structural are made using two kinds of fibers as layer A, and the sound transmission loss (STL) was measured using reverberation room and anechoic room. The measurement shows that the ABA using kapok fiber as sound absorption layer has better sound insulations, and the STL of ABA using kapok fiber as sound absorption layer is increased by about 3 dB. A model for estimating STL of ABA structure is established and the calculated STL is validated. Using the developed model, the STL of ABA structures with different structural characteristics of Layers A or B is calculated and analyzed.

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Section: Introductionmentioning

confidence: 99%