Sound absorption coefficient and sound transmission loss of porous sponge attached corrugated cardboard of noise insulation cover

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 CG-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.