Sound Absorption Coefficient and Sound Transmission Loss of Porous Sponge Attached Corrugated Cardboard of Noise Insulation Cover
Journal of Korea Technical Association of the Pulp and Paper Industry(2020)
摘要
The objective of this study is to estimate the noise control capability of a sound barrier developed using a porous sponge attached to a corrugated cardboard (CC) specifically for household blender (BL). The sound absorption coefficient and transmission loss of a triple tri-wall CC are estimated by the transfer-function and transfer-matrix methods, respectively. The sound pressure levels of the BL, CC-covered BL, and porous sponge attached to the CC-covered BL are estimated using a 1/3-octave sound pressure level meter. The mean sound absorption coefficients of a double-layered 1.5 cm thick CC and 3 cm thick porous sponge attached to a double-layered 1.5 cm thick CC are 0.10 and 0.58, respectively. In the case of the porous sponge attached to the CC-covered BL, the sound absorption coefficient value reached 0.82 in the frequency range 3–4 KHz. The mean sound transmission loss of the CC and porous sponge attached to the CC-covered BL are 50.70 and 64.74 dB, respectively. The sound pressure level of the BL, CC, and porous sponge attached to the CC-covered BL are 82.9, 65.7, and 61.2 dB, respectively. The difference in the sound pressure level between the BL and the porous sponge attached to the CC-covered BL is about 20 dB. The findings from this study can be used in potential applications for using porous sponges attached to a CC-covered BL as a noise insulation cover for household BL.
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关键词
corrugated cardboard,sound transmission loss,sound transmission,porous sponge
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