Panel absorbers convert sound into internal friction and respond to pressure

Evidence

Resonant absorbers, such as wood paneling, work because the incident sound energy causes vibrations in the absorber and these are converted to frictional losses within the absorbing structure itself. This makes them sensitive to the pressure component of the sound wave and so they work well when attached to walls. — David Howard, Jamie Angus, coustics and Psychoacoustics, 2100

Categorization

• DEFINE: Clarifies how resonant absorbers differ from porous ones by sensing pressure rather than velocity — key contrast for choosing acoustic treatments.
• XREF: connects to: Porous absorbers damp sound through velocity-induced frictional losses — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2046; Heavier panel absorbers resonate at lower frequencies — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2054; Walls absorb sound by converting organized acoustic energy into heat through friction (+6 more)

Broader Connections

• Wall friction converts organized oscillating air motion into heat, damping sound #corroborates (0.88) — Eric J. Heller, Why You Hear What You Hear- An…, 1438
• Walls absorb sound by converting organized acoustic energy into heat through friction #corroborates (0.85)
• Porous materials absorb sound because their large surface area creates frictional losses. #corroborates (0.85) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 344
• Room corners host membrane absorbers that act on LF standing-wave pressure maxima #expands (0.85)
• Heavier panel absorbers resonate at lower frequencies #expands (0.82) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2054
• Wood paneling naturally absorbs low frequencies and balanced mansion hall acoustics #exemplifies (0.82)
• Porous absorbers damp sound through velocity-induced frictional losses #qualifies (0.80) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2046
• Deeper rear cavities and heavier panels lower a resonant absorber’s tuning frequency #expands (0.78) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2052
• Resonant panel absorber formulas lose accuracy for thick panels because stiffness is ignored #complicates (0.74)