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Durability, Acoustic Performance and Process Efficiencies of Absorbent Fibers for Muffler Filling
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 17, 1999 by SAE International in United States
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Silencers are very often filled with absorbent fibers to optimize the acoustic performance, particularly when the volume is limited. The fibers have to meet several specifications concerning (1) acoustic damping as a function of frequency, (2) temperature stability, (3) processing, and (4) blow-out resistance. This paper will review the characteristic properties for continuous fibers including Advantex™ versus standard E Glass as well as discontinuous fibers such as basalt wool. The failure mechanism of the various fibers will be explored in detail. Thermal shock testing, single filament tensile strengths, and weight loss measurements will be used to contrast the failure mechanism of these fibers. Additionally, the acoustic performance of silencers filled with different fibers will be analyzed and compared. The selection of different filling materials is closely linked to the production process utilized. A system which automatically injects specially designed continuous glass fibers into each silencer will be presented, and its capabilities will be evaluated.
|Technical Paper||Materials for Absorptive Silencer Systems|
|Technical Paper||The Impact of Fiber Filling Density Variation on the Acoustic Performance of Silencers|
|Technical Paper||Acoustic Attenuation Performance of Perforated Absorbing Silencers|
CitationCofer, C., Bielert, F., and Kullmann, T., "Durability, Acoustic Performance and Process Efficiencies of Absorbent Fibers for Muffler Filling," SAE Technical Paper 1999-01-1655, 1999, https://doi.org/10.4271/1999-01-1655.
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