Influence of screw spacings on sound reduction index in lightweight partitions

Rubio, Constanza; Sinisterra, Jaime; Bravo, José María; Lull, Cristina; Estelles, Hermelando

doi:10.1016/s0003-682x(01)00072-x

Cited by 12 publications

(8 citation statements)

References 8 publications

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“…Only a few studies 23 24 have been reported on the measurement of the sound attenuation index on sandwich composites, mainly because of the required size of the specimens. These sizes range from large panels to wall partitions 25 , and along with the required equipment, remain outside the scope of this study. However, this method is something which can be studied in the future.…”

Section: Resultsmentioning

confidence: 99%

Natural Cork Agglomerate Employed as an Environmentally Friendly Solution for Quiet Sandwich Composites

Sargianis

Kim

Suhr

2012

Sci Rep

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Carbon fiber-synthetic foam core sandwich composites are widely used for many structural applications due to their superior mechanical performance and low weight. Unfortunately these structures typically have very poor acoustic performance. There is increasingly growing demand in mitigating this noise issue in sandwich composite structures. This study shows that marrying carbon fiber composites with natural cork in a sandwich structure provides a synergistic effect yielding a noise-free sandwich composite structure without the sacrifice of mechanical performance or weight. Moreover the cork-core sandwich composites boast a 250% improvement in damping performance, providing increased durability and lifetime operation. Additionally as the world seeks environmentally friendly materials, the harvesting of cork is a natural, renewable process which reduces subsequent carbon footprints. Such a transition from synthetic foam cores to natural cork cores could provide unprecedented improvements in acoustic and vibrational performance in applications such as aircraft cabins or wind turbine blades.

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Section: Resultsmentioning

confidence: 99%

Natural Cork Agglomerate Employed as an Environmentally Friendly Solution for Quiet Sandwich Composites

Sargianis

Kim

Suhr

2012

Sci Rep

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“…for f > f c (15) where P is the perimeter of the the plate and S is the area of the plate. From this formula it can be seen that below the critical frequency f c the radiation Figure 14: Laser Doppler vibrometry data based calculated radiation efficiency as function of frequency (for a configuration description see Table 1).…”

Section: Sound Power Analysis and Radiation Efficiency Analysismentioning

confidence: 99%

“…Finally, in ref. [15] the effect of screw spacing was investigated for steel frame studs, considering two screw spacings of 300 and 600 mm.…”

Section: Introductionmentioning

confidence: 99%

Influence of panel fastening on the acoustic performance of light-weight building elements: Study by sound transmission and laser scanning vibrometry

Roozen

Muellner²,

Labelle

et al. 2015

Journal of Sound and Vibration

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Structural details and workmanship can cause considerable differences in sound insulation properties of timber frame partitions. In this study, the influence of panel fastening is investigated experimentally by means of standardized sound reduction index measurements, supported by detailed scanning laser Doppler vibrometry. In particular the effect of the number of screws used to fasten the panels to the studs, and the tightness of the screws, is studied using seven different configurations of lightweight timber frame building elements. In the frequency range from 300 to 4000 Hz, differences in the weighted sound reduction index R W as large as 10dB were measured, suggesting that the method of fastening can have a large impact on the acoustic performance of building elements. Using the measured vibrational responses of the element, its acoustic radiation efficiency was computed numerically by means of a Rayleigh integral. The increased radiation efficiency partly explains the reduced sound reduction index. Loosening the screws, or reducing the number of screws, lowers the radiation efficiency, and

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“…Kaip sumažinti rezonanso įtaką taikant lakštines medžiagas, parodyta Matsumoto et al (2006), Uris et al (2002) publikacijose. Jose laboratoriniais matavimais įrodoma, kaip daugiasluoksnėmis konstrukcijomis galima pasiekti oro garso izoliavimo rodiklio vertes, didesnes kaip 60 dB.…”

Section: Daugiasluoksnių Konstrukcijų Ore Sklindančio Garso Izoliavimunclassified

Mūrinių Konstrukcijų Garso Izoliavimas Papildomais Lanksčiais Sluoksniais

Mickaitis

Jagniatinskis

Fiks

2011

Statybinės Konstrukcijos ir Technologijos

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For the purposes of accumulating knowledge of how to comply with requirements for new buildings of obligatory sound class C or enhanced acoustic comfort sound classes A and B (Lithuanian Building Technical regulations STR 2.01.07:2003), the article discusses improvement on airborne sound insulation of partitions between dwellings using additional plasterboard layers. The results of an empirical approach were obtained performing in situ measurements of the partitions of masonry from silicate blocks and expanded-clay concrete blocks. Theoretical calculations without the evaluation of flanking paths are added. The paper looks at the peculiarities of in situ measurement methods and the estimation of the limiting uncertainty of the sound reduction index. It is showed that the values of the in situ measurements of the airborne sound reduction index in accordance with requirements EN ISO 140 and EN ISO 717 series for rooms having volume higher than 50 m3 varies depending on frequency range. It has been stated, that improvement on the weighed airborne sound reduction index in the frequency range from 100 Hz to 3150 Hz depends on the properties of additional layers and on the characteristics of the main constructions. Resonance in the low frequency range arising due to additional layers may reduce the weighed airborne sound reduction index defined in the frequency range from 50 Hz to 3150 Hz. This fact must be taken into account when designing improvement on masonry wall insulation using an additional layer in dwellings.

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Influence of screw spacings on sound reduction index in lightweight partitions

Cited by 12 publications

References 8 publications

Natural Cork Agglomerate Employed as an Environmentally Friendly Solution for Quiet Sandwich Composites

Natural Cork Agglomerate Employed as an Environmentally Friendly Solution for Quiet Sandwich Composites

Influence of panel fastening on the acoustic performance of light-weight building elements: Study by sound transmission and laser scanning vibrometry

Mūrinių Konstrukcijų Garso Izoliavimas Papildomais Lanksčiais Sluoksniais

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