Lip oscillation sustains continuously while airflow and adduction persist

Evidence

The air pressure behind the lips (vocal folds) tends to push them apart, as does the natural elastic tendency to bring them back toward the equilibrium position. Like displaced pendulums, the lips (vocal folds) accelerate to their equilibrium position, slow down as they continue beyond it until they stop and return toward each other, and the pressure-drop effect accelerates them together again. The oscillation of the lips will be sustained while there is airflow and the lips (vocal folds) remain adducted. The vibration will be regular if the two lips (vocal folds) have similar masses and tensions. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1242

Categorization

• DEFINE: Models lip/fold oscillation as coupled pendulum motion with a pressure-drop drive, explaining regularity via matched masses and tensions.
• XREF: connects to: Lip and vocal fold vibration is driven by Bernoulli pressure reduction from airflow — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1240; Curved-surface airflow, not the Bernoulli effect, drives lip vibration. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1238; Elastic lips sustain oscillation only when energy is continuously input (+10 more)

Broader Connections

• Elastic lips sustain oscillation only when energy is continuously input #corroborates (0.86)
• Reed oscillation is self-sustaining through a positive feedback loop of airflow and pressure #expands (0.85) — David Howard, Jamie Angus, coustics and Psychoacoustics, 1227
• Elastic lips and vocal folds self-oscillate once energy input begins. #qualifies (0.80) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1237
• Lip vibration self-sustains through Bernoulli pressure and elastic recoil #expands (0.80)
• Reed oscillation is a damped spring cycle renewed by airflow #corroborates (0.80) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1199
• Curved-surface airflow, not the Bernoulli effect, drives lip vibration. #complicates (0.78) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1238
• Lips only begin oscillating as a reed once airflow passes a threshold #qualifies (0.76) — David Howard, Jamie Angus, coustics and Psychoacoustics, 1263
• Air reed oscillation is driven by pressure pulse reflections at the pipe mouth #exemplifies (0.75) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1159
• The vocal folds vibrate via pressure changes from curved airflow, not the Bernoulli effect #complicates (0.75) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1325
• Vocal fold oscillation frequency is predictable without invoking aerodynamic forces #complicates (0.74) — Eric J. Heller, Why You Hear What You Hear- An…, 1735
• Whistling sound arises from cooperative resonance between lip vortices and vocal tract formants #qualifies (0.73) — Eric J. Heller, Why You Hear What You Hear- An…, 1326
• Bernoulli’s airflow across curved lips initiates their vibration #complicates (0.72)