Phenomenon for lip motor boating?

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SUMMARY

The discussion centers on the phenomenon of lip motorboating, which involves exhaling with closed lips to create a vibrating sound. Key factors influencing lip vibration include exhalation pressure, lip stiffness, and gravity's role, which may be negligible. The conversation highlights the relevance of static aeroelastic equations of motion and draws parallels to wind instruments, where lip control is crucial for sound production. Instruments like the Didgeridoo exemplify how lip vibration contributes to resonance and sound quality.

PREREQUISITES
  • Understanding of fluid dynamics and air pressure
  • Familiarity with basic principles of sound production in wind instruments
  • Knowledge of static aeroelastic equations of motion
  • Concepts of lip stiffness and its impact on vibration
NEXT STEPS
  • Research the physics of lip vibration in wind instruments
  • Study static aeroelastic equations of motion in detail
  • Explore the mechanics of sound production in brass instruments
  • Investigate the resonance effects in the Didgeridoo and similar instruments
USEFUL FOR

Musicians, acoustics researchers, engineers designing microvalves, and anyone interested in the physics of sound production and vibration mechanics.

yangshi
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Randomly popped in my mind when trying to design microvalves and no idea where to post this... Lip motorboating is when you exhale with your mouth closed, causing your lips to flap like a horse and make a fart sound. My question is not what causes the sound but what causes the lip vibration. Any explanations (i.e cyclic battle b/w exhale pressure and stiffness/gravity) or EASY papers on this? I’d like specifics too (i.e is gravity negligible?)

Edit: Any related equations would be nice too - i.e (spitballing here...) static aeroelastic equations of motion.
 
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If you are serious, the effect you describe is used to play a wind instrument.
The lips control a vibrating bit of wood held in the mouth in reed instruments while the musicians lips purse together and vibrate in an external metal mouthpiece in brass_instruments particularly horns.

The sound derives from air movement from the lungs while controlling lip positions. An excellent example from early wood instruments, the Didgeridoo provides resonance that reverberates in the player's (and listeners') chest.

 

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