Sound absorption/Acoustuic attenuation coefficeint (α(ω)) of PVC foam?

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SUMMARY

The discussion focuses on determining the frequency-dependent attenuation coefficient (α(ω)) of PVC foam, specifically at 220Hz. The user seeks reliable sources for this coefficient, noting that existing literature primarily covers frequencies above 500Hz. A suggested source is a ResearchGate article that provides data on PVC polymer absorption coefficients. Additionally, a Google search for sound absorption of foam at 220Hz yielded useful results, indicating that effective foam design should prioritize absorption starting at 125Hz and extending beyond 500Hz.

PREREQUISITES
  • Understanding of frequency-dependent attenuation coefficients in acoustics
  • Familiarity with PVC foam properties and applications
  • Knowledge of sound absorption principles and measurement techniques
  • Basic research skills for sourcing scientific literature
NEXT STEPS
  • Investigate the attenuation coefficient of PVC foam at various frequencies
  • Explore acoustic absorption techniques for materials below 500Hz
  • Review the principles of foam design for sound absorption
  • Examine the relationship between foam thickness and sound absorption efficiency
USEFUL FOR

Acoustic engineers, materials scientists, and researchers involved in sound absorption studies will benefit from this discussion, particularly those focused on PVC foam applications in noise control and acoustic treatment.

Marcogoodie
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Homework Statement
What are some good sources providing the attenuation coefficient/sound absorption coefficient (properties) of PVC foam?
Relevant Equations
Power-law frequency-dependent acoustic attenuation:

P(x+Δx)=P(x)e ^(−α(ω)Δx); α(ω)=α0ω^(η)

Source: https://en.wikipedia.org/wiki/Acoustic_attenuation#Power-law%20frequency-dependent_acoustic_attenuation
I am currently doing a physics experiment to find the frequency-dependent attenuation coefficient (α(ω) )of pvc foam, are there any verified/reliable sources that show the attenuation coefficient α(ω) of pvc foam or materials in general?

Best I found is this: https://www.researchgate.net/figure...mer-as-a-function-of-thickness_fig6_258726695

The source above only shows the attenuation coeffcieint of pvc foam from 500Hz and above, but I'm investigating the attenuation coefficient at 220Hz. There are sources of attenuation coefficients for pvc composities on google, but not for pure pvc foam. Is there somewhere that I can find sample values? Thanks in advance!
 
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Welcome to PF. :smile:

I don't know if this helps, but I did a Google search on sound absorption of foam at 220Hz and got some good hits. Maybe have a look through the hit list to see if it gives you some ideas:

https://www.google.com/search?client=firefox-b-1-d&q=sound+absorption+of+foam+at+220Hz

What frequency does foam absorb?
It is better to design a foam technology that has more absorption above 125 Hz. and then transitions slowly up through and past 500 Hz. where every foam absorbs at 100%. This greater amount of absorption beginning at 125 Hz.
https://www.acousticfields.com/sound-absorborption/