High-sound-insulation double floor structure with Helmholtz resonators: Experimental study on effect of resonator specifications

The air layer between the interior finishes and the structure is used as piping and wiring space. In many cases, ceilings and dry-type double floors are commonly constructed in Japan. However, the effect of the air layer of ceilings and dry-type double floors on the heavy-weight floor impact sound insulation performance has not yet quantitatively investigated. Therefore, in this study, the same floor and ceiling structures were constructed for concrete and CLT buildings, and the heavy-weight floor impact sound was investigated. As results, it was confirmed that the reduction amount of the heavy-weight floor impact sound by the ceiling tended to be smaller in CLT buildings than in concrete buildings. However, the trends were similar. Due to the dry-type double floor structure, the heavy-weight floor impact sound level was increased in concrete building and decreased in CLT building at 63 Hz in the octave band center frequency band. Therefore, it can be said that the dry-type double floor structure can be used to improve the heavy-weight floor impact sound performance in the CLT building.

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High sound insulation property of prepared polypropylene/polyolefin elastomer blends by combining pressure-induced-flow processing and supercritical CO2 foaming

Composites Communications ◽

10.1016/j.coco.2021.100958 ◽

2021 ◽

Vol 28 ◽

pp. 100958

Author(s):

Zhizhe Du ◽

Feng Chen ◽

Yanpei Fei ◽

Jiangming Jin ◽

Pengfei Li ◽

...

Keyword(s):

Supercritical Co2 ◽

Sound Insulation ◽

Insulation Property ◽

Polyolefin Elastomer ◽

Induced Flow ◽

High Sound

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Design of lightweight partitions with high sound insulation

Plastics in Building Structures ◽

10.1016/b978-1-4831-9815-6.50026-3 ◽

1966 ◽

pp. 137-142

Author(s):

G. Berry

Keyword(s):

Sound Insulation ◽

High Sound

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Numerical study for increasement of low frequency sound insulation of double-panel structure using sonic crystals with distributed Helmholtz resonators

International Journal of Modern Physics B ◽

10.1142/s0217979219501388 ◽

2019 ◽

Vol 33 (14) ◽

pp. 1950138

Author(s):

Myong-Jin Kim

Keyword(s):

Free Space ◽

Transmission Loss ◽

Numerical Study ◽

Low Frequency ◽

Helmholtz Resonator ◽

Sound Insulation ◽

The Finite Element Method ◽

Helmholtz Resonators ◽

Sonic Crystal ◽

Sonic Crystals

Numerical simulations of the sound transmission loss (STL) of a double-panel structure (DPS) with sonic crystal (SC) comprised of distributed local resonators are presented. The Local Resonant Sonic Crystal (LRSC) consists of “C”-shaped Helmholtz resonator columns with different resonant frequencies. The finite element method is used to calculate the STL of such a DPS. First, the STLs of LRSC in free space and the DPS with LRSC are calculated and compared. It is shown that the sound insulations of the local resonators inserted in the double panel are higher than that in free space for the same size of the SCs and the same number of columns. Next, STL of the DPS in which the SC composed of three columns of local resonators having the same outer and inner diameters but different slot widths are calculated, and a reasonable arrangement order is determined. Finally, the soundproofing performances of DPS with distributed LRSC are compared with the case of insertion of general cylindrical SC for SC embedded in glass wool and not. The results show that the sound insulation of the DPS can be significantly improved in the low frequency range while reducing the total mass without increasing the thickness.

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