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

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Discussion Overview

The discussion centers around the search for materials that effectively reflect low-frequency sound, specifically in the context of reducing noise in AC/Heating systems in airplanes. Participants explore potential materials and mechanisms for noise reduction, referencing existing literature and concepts in engineering noise control.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant seeks information on materials that reflect sound at low frequencies (500Hz to 1KHz) for use in a muffler design.
  • Another participant suggests researching "quiet steel," a product associated with Ford, which reportedly uses a rubber coating to absorb engine noise, implying it may be tunable to specific frequencies.
  • A participant expresses a lack of engagement from others on this engineering topic.

Areas of Agreement / Disagreement

There is no consensus among participants, and the discussion remains unresolved with multiple viewpoints and suggestions presented.

Contextual Notes

Participants have not defined specific geometries or parameters for the application, and there may be limitations in the assumptions regarding material properties and their effectiveness at the specified frequencies.

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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