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

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The discussion focuses on reducing noise in AC/Heating systems in airplanes, specifically seeking materials effective at reflecting low-frequency sound between 500Hz and 1KHz. The project involves creating a muffler with closed ends, though specific geometry and parameters are not yet defined. Suggestions include researching "quiet steel," a Ford innovation that uses a rubber coating to absorb engine noise, which may be tunable to the desired frequencies. Participants express a lack of engagement in this niche engineering topic, highlighting the challenge of finding relevant information. Overall, the thread emphasizes the need for effective noise reduction mechanisms in aviation systems.
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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