Which Materials Reflect Low-Frequency Sound in AC/Heating Systems?

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SUMMARY

This discussion focuses on materials that effectively reflect low-frequency sound, specifically between 500Hz and 1KHz, in AC and heating systems for airplanes. The user is exploring options for a muffler design and references literature on Engineering Noise Control and Active/Passive noise control. A suggestion was made to investigate "quiet steel," a material used by Ford, which incorporates a rubber coating designed to absorb engine noise. The conversation highlights the need for further research into specific materials and their acoustic properties.

PREREQUISITES
  • Understanding of Engineering Noise Control principles
  • Familiarity with Active and Passive noise control techniques
  • Knowledge of acoustic material properties
  • Basic concepts of muffler design in HVAC systems
NEXT STEPS
  • Research materials that reflect low-frequency sound, focusing on acoustic properties
  • Investigate the design and effectiveness of mufflers in HVAC systems
  • Explore the application of "quiet steel" and its acoustic benefits
  • Study the principles of sound absorption and reflection in engineering contexts
USEFUL FOR

Acoustic engineers, HVAC system designers, and anyone involved in noise reduction strategies for aircraft systems will benefit from this discussion.

leka
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hi everyone,
I am currently working on a project to reduce noise in AC/Heating systems in airplanes. As reference am using some literature in Engineering Noise Control and some research papers on Active/Passive noise control. I am currently searching for some information on; if there are materials that are good reflectors of sound at low frequencies, between 500Hz and 1KHz. The current aplication that have in mind calls for a sort of a muffler(closed ends pipe, from outside). Geometry and other parameters are not defined yet.
If anyone has any sources or knows any information related to mechanisms for noise reduction or have any ideas feel free to elaborate.

cheers
 
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hmmm,
guess no one is involved with this aspect of engineering...
cheers
 
I would google 'quiet steel' which is some Ford gimic. I think it is just a rubber coating with a speherical rubber filler which is pasted onto the firewall to absorbe engine noise.

Wouldn'd be suprised if you couldn't tune it to your frequencies.
 
thanks for the info...
 

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