Branch transverse vibrations are the active oscillators in tree sound absorption.

Evidence

Transverse modes of vibration of the branches were shown to be the oscillators active in the frequency range of interest, 250 cps in the lower branches to about 1100 cps near the top of the tree; indications were that trunk resonances might also be important. — T. F. W. Embleton, Sound Propagation in Homogeneous…, 2

Categorization

• ADDENDUM: Directly extends the Grafting & Growth trees-as-infrastructure piece: the acoustic mechanics of tree bodies as a rarely-cited ‘infrastructure’ function of a wood.
• recurring: this claim recurs 2 times within its source
• XREF: connects to: A source at a wood’s edge creates large boundary effects on forest sound attenuation. — T. F. W. Embleton, Sound Propagation in Homogeneous…, 14; Tree branches, not leaves or twigs, resonate as forced acoustic oscillators near 275-450 cps. — T. F. W. Embleton, Sound Propagation in Homogeneous…, 49; Struck bars vibrate in non-harmonically related transverse modes — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1269 (+1 more)

Related

• Tree branches, not leaves or twigs, resonate as forced acoustic oscillators near 275-450 cps. (similarity 0.92)
• Trunk scatter cannot alone explain forest high-frequency sound attenuation (similarity 0.85)
• A source at a wood’s edge creates large boundary effects on forest sound attenuation. (similarity 0.84)
• Open and dense forest canopies create distinct sound atmospheres (similarity 0.81)
• Woods sound attenuation stays near constant regardless of optical visibility through the canopy. (similarity 0.81)
• Low absorption levels increase reverberant field level by sustaining sound energy (similarity 0.80)
• Struck bars vibrate in non-harmonically related transverse modes (similarity 0.79)
• T. F. W. Embleton — Sound Propagation in Homogeneous Deciduous and Evergreen Woods (similarity 0.79)

Broader Connections

• Tree branches, not leaves or twigs, resonate as forced acoustic oscillators near 275-450 cps. #corroborates (0.95) — T. F. W. Embleton, Sound Propagation in Homogeneous…, 49
• Struck bars vibrate in non-harmonically related transverse modes #expands (0.70) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1269
• Trunk scatter cannot alone explain forest high-frequency sound attenuation #corroborates (0.70) — Margaret A. Price, Keith Attenborough, and Nicholas W. Heap, Sound Attenuation through Trees, 87