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Experimental investigation on the enhancement of plenum window noise reduction using solid scatterers
Xiao-Long Li1, Wai Kit Lam2, S K Tang3
1Faculty of Architecture and Urban Planning, Chongqing University, Chongqing, China.
The Journal of the Acoustical Society of America
|March 1, 2023
Summary
Sound transmission through plenum windows was studied using scale-down models. Cylindrical scatterer arrays showed potential for sound reduction, especially at higher frequencies, by creating bandgaps.
Area of Science:
- Acoustics
- Materials Science
Background:
- Plenum windows can be pathways for sound transmission.
- Sonic crystals offer potential for acoustic manipulation.
Purpose of the Study:
- Investigate sound transmission across plenum windows with cylindrical scatterer arrays.
- Analyze the influence of array configuration, gap, and scatterer size on sound reduction.
Main Methods:
- Scale-down model measurements.
- Experiments conducted in a fully anechoic chamber.
- Systematic variation of plenum window gap, array configuration, and scatterer diameter.
Main Results:
- Low-frequency sound transmission is governed by window cavity and gap modes.
- Scatterers have minimal impact on sound transmission at low frequencies.
- Higher frequencies exhibit significant sound reduction with scatterers attached to walls, particularly near bandgap frequencies.
Conclusions:
- Cylindrical scatterer arrays mimic virtual sonic crystal behavior.
- Bandgaps created by scatterer arrays are crucial for broadband sound reduction.
- Optimized array configurations can enhance soundproofing in plenum windows.
