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Sound Absorption Performance of Membrane Covered Insulators
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 30, 2001 by SAE International in United States
Annotation ability available
Molded fiberglass hood insulators (hoodliners) and engine side dash insulators (dashliners) are widely applied in vehicles for noise control. These absorptive components reduce reverberant “build-up” in the engine compartment and thus cut the noise transmission into the passenger compartment. Due to restrictions of underhood space, the hood and dash insulators normally have limited thickness (under 1.5 inches), which results in inadequate noise absorption coefficient in mid and low frequencies (100Hz - 2000 Hz), where the peak of engine compartment noise spectrum exists.
It is known that covering the porous absorptive panel (at the noise incident surface) with an impermeable membrane will increase the mid-low frequency absorption coefficient of the panel at the cost of some high frequency absorption coefficient loss.
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CitationShao, G., Billy, T., and Hughes, T., "Sound Absorption Performance of Membrane Covered Insulators," SAE Technical Paper 2001-01-1455, 2001, https://doi.org/10.4271/2001-01-1455.
- Baxa. D “Noise Control in Internal Combustion Engines” Robert E. Krieger Publishing 1989
- Beranek. L “Noise and Vibration Control Engineering” Wiley-International Publication 1992
- Priede. T “The Problems of Noise of Engines in Different Vehicle Groups” SAE Technical Paper 750795
- Hirabayashi T. et.al “Application of Noise Control and Heat Insulation Materials and Devices in the Automotive Industry” SAE paper 95137