scholarly journals Analysis of Sound Transmission Characteristics of Multi-complex Panel for Noise Reduction in High Value-added Vessel Cabin

2012 ◽  
Vol 26 (3) ◽  
pp. 13-19
Author(s):  
Hyun-Wung Kwon ◽  
Suk-Youn Hong ◽  
Hyun-Gwon Kil ◽  
Hwa-Muk Kim ◽  
Jee-Hun Song
Keyword(s):  
Noise Reduction ◽  
Sound Transmission ◽  
Value Added ◽  
Transmission Characteristics

Vibration Transmission Between Columns and Built Up Structures

1994 ◽  
Vol 1 (3) ◽  
pp. 235-246
Author(s):  
John A. Steel
Keyword(s):  
Sound Transmission ◽  
Transmission Characteristics ◽  
Vibration Transmission ◽  
Laboratory Models ◽  
Good Agreement

Vibration transmission from columns into built up structures is studied using laboratory models. Beams attached to plates, forming built up structures, can influence transmission characteristics at these joints. Good agreement is found between measured and predicted results. The orientation of the beams effects coupling and strongest coupling is through a twisting moment applied to the beam. The effects of these changes in coupling on sound transmission between floors is discussed.

scholarly journals Pembuatan Sistem Perancang Peredam Kebisingan

2020 ◽  
Vol 4 (2) ◽  
pp. 56-64
Author(s):  
Rahmat Bagus Prasetya ◽  
Sunartoto Gunadi ◽  
Erna Kusuma Wati
Keyword(s):  
Data Collection ◽  
Noise Reduction ◽  
Transmission Coefficient ◽  
Loss Factor ◽  
Measurement Method ◽  
Sound Transmission ◽  
Reduction Coefficient ◽  
Noise Measurements ◽  
At Home

One of the problems experienced by the community, whether at home or at work, was the disruption in the sense of concentration caused by noise. This study aims to measure noise as well as provide materials to reduce noise in the area. The time for data collection was one day, carried out for 4 samples of data collection based on a reference from the Ministry of Environment, no: Kep-48 / MENLH / 11/1996. The measurement method also using SNI standard number 7231 in 2009. Then based on the noise value displayed on the instrument, material recommendations will be given based on the value of Noise Reduction Coefficient (NRC), Sound Transmission Coefficient (STC) and Loss Factor. The results of noise measurements at the AT-Taqwa Mosque are 77.1 dB and the recommended material recommended by the tool is Acourete Perfowood - Acoustic Panel 881 with NRC 0.375. While the measurement at the Musholla at Pasar Minggu station is 76.8 dB and the recommended material recommended by the tool is Accourete Fiber 300 with an NRC of 0.44.

Sound transmission loss characteristics of sandwich aircraft panels: Influence of nature of core

2016 ◽  
Vol 19 (1) ◽  
pp. 26-48 ◽  
Author(s):  
MP Arunkumar ◽  
Jeyaraj Pitchaimani ◽  
KV Gangadharan ◽  
MC Lenin Babu
Keyword(s):  
Sandwich Panel ◽  
Transmission Loss ◽  
Sheet Material ◽  
Low Frequency ◽  
Sandwich Panels ◽  
Sound Transmission ◽  
Sound Transmission Loss ◽  
Honeycomb Core ◽  
Transmission Characteristics ◽  
The Impact

Sandwich panel which has a design involving acoustic comfort is always denser and larger in size than the design involving mechanical strength. The respective short come can be solved by exploring the impact of core geometry on sound transmission characteristics of sandwich panels. In this aspect, the present work focuses on the study of influence of core geometry on sound transmission characteristics of sandwich panels which are commonly used as aircraft structures. Numerical investigation has been carried out based on a 2D model with equivalent elastic properties. The present study has found that, for a honeycomb core sandwich panel in due consideration to space constraint, better sound transmission characteristics can be achieved with lower core height. It is observed that, for a honeycomb core sandwich panel, one can select cell size as the parameter to reduce the weight with out affecting the sound transmission loss. Triangular core sandwich panel can be used for low frequency application due to its increased transmission loss. In foam core sandwich panel, it is noticed that the effect of face sheet material on sound transmission loss is significant and this can be controlled by varying the density of foam.

Noise reduction of plenum window with add-in dual staggered sound scatterer arrays

2021 ◽  
Vol 263 (5) ◽  
pp. 1539-1547
Author(s):  
Xiaolong LI ◽  
Shiu Keung Tang ◽  
Shiu-Keung, Tang
Keyword(s):  
Noise Reduction ◽  
Transmission Loss ◽  
Computational Simulation ◽  
Sound Transmission ◽  
Sound Field ◽  
Model Space ◽  
Sound Transmission Loss ◽  
Sound Energy ◽  
Window System ◽  
Sonic Crystal

In present study, a 1:4 scaled down model was used to explore the noise reduction across the plenum window with add-in dual staggered scatterer arrays (sonic-crystal). Reverberation time inside the model space was measured firstly to eliminate the effect of the possible reverberation variation on the sound transmission loss of the plenum window. Two sonic-crystal arrays, the two-by-two and two-by-three scatterer arrangements, were adopted for measurement. A total of four arrays was thus tested after the staggering. Computational simulation was conducted for the sound field inside the plenum chamber to study the noise reduction mechanism of the present window system. Results show that the noise reduction of the plenum window was improved by varying degrees due to the placement of the dual staggered sonic-crystal. The Installation of the dual staggered sonic-crystal increased the sound energy reflections out of the plenum window inlet and decreased the sound energy that passed through the plenum window cavity. At the same time, the resonances inside the window cavity also contributed to the sound transmission loss of the plenum window. The noise reduction across the plenum window was enhanced. The improvement was between ~2 to ~2.7 dBA.

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