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Science & Tech.
Pradeep Kumar

11/09/21 11:35 AM IST

Noise Control Sheet Absorber

In news

An Indian researcher has fabricated paper honeycomb and stronger polymer honeycomb structure as sound-absorbing panels that dissipate acoustic energy to low-frequency ranges.

Details
  • The technology can be used in building acoustics and also as environmental noise control solution.
  • Many traditional materials have been found to be good at controlling higher frequencies.
  • However, natural bee hives have been found to efficiently control high as well as low frequencies because of their geometry.
  • It has been found from theoretical analysis and experimental investigations that this behaviour was owing to the conversion of acoustical energy into vibration energy. 
  • This vibration energy is dissipated in the form of heat due to wall damping property.
  • Mimicking this property as an engineering solution could offer a cost-effective method for controlling noise pollution.
  • The design methodology involves understanding the physics of bee hive sample acoustic energy dissipation and then mimicking its design. 
How the Panel was made?
  • The panels were made by slicing stacked extruded polypropene straws.
  • The slicing process is done with the help of hot wire, which also bonds the straws together.
  • The developed technology provides a mechanism of acoustic energy dissipation with lower thickness and higher specific strength of acoustic panels.
  • A test facility to measure the absorption coefficient of large samples has also been established as part of this work.
Source: PIB

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