A Study for Improving the Acoustic Performance of Dash Isolation Pad Using Hollow Fiber

Lee, Jung Wook; Lee, Wonku; Lee, Su Nam; Park, Sang Woo

doi:10.4271/2013-01-0101

Cited by 4 publications

(1 citation statement)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

Sound Package

2018

Noise and Vibration Control in Automotive Bodies

View full text Add to dashboard Cite

An investigation on interior noise reduction using 2D locally resonant phononic crystal with point defect on car ceiling

Zhang

Zuo

et al. 2018

Journal of Vibration and Control

View full text Add to dashboard Cite

Interior noise, as one of the indicators of automotive NVH (noise, vibration and harshness) performance, has been associated with an increasing importance in ride comfort evaluation. This paper presents a new method of interior noise reduction based on phononic crystal theory. Considering the lightweight requirement, the car ceiling plate is divided into nine regions to determine where the phononic oscillators should be mounted. By leveraging the acoustic contribution analysis of each region, the phononic crystal is arranged in the region that contributes the most to interior noise, bringing out the best attenuation effect in its bandgap. However, it is noted that at certain frequencies, the vibration of the ceiling plate or other body plates, which exhibits negative contribution to interior noise, should not be attenuated due to their beneficial effects. Thus in this paper, a point defect is employed for the design of a two-dimensional (2D) phononic crystal structure to preserve the negative contribution part of the plate’s vibration at specific frequencies. The validity of the proposed method in interior noise reduction is verified by simulation. Moreover, the error analysis is implemented and an optimization scheme is proposed.

show abstract

A Study for Improving the Acoustic Performance of Dash Isolation Pad Using Hollow Fiber

Cited by 4 publications

References 7 publications

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

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

Sound Package

An investigation on interior noise reduction using 2D locally resonant phononic crystal with point defect on car ceiling

Contact Info

Product

Resources

About