Helmholtz Resonators.

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Presentation transcript:

Helmholtz Resonators

Bottle Band

More examples: Whistling Jar Pre-Columbian Whistling Jar Basic Principle of Operation https://www.youtube.com/watch?v=Qo6B79uLf3g (brief description of construction and cultural usage) https://www.youtube.com/watch?v=VhQM6wMIt_A (1 min demo of natural sounds) Image from: http://www.prices4antiques.com/ Image from: http://www.mountainsocarina.com/lessons/lesson02-a7b.html

Yet more examples: The Ocarina Ocarinas Basic Principle of Operation http://www.biophysics.uwa.edu.au/turbulence/animations/Miko_1.gif

Spring Mass System in Disguise Air plug in neck “bobs” in a big sea of air molecules

Resonant Frequency vsound velocity of sound waves in air L length of plug of air in neck S neck cross-section V chamber volume of air

Assumptions…you know what they say Which variable(s) is changing among these Coke bottles? How do these Coke bottles compare to the simple physics model? How would you determine S, L, and V?

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Resources Univ of New South Wales Acoustical Physics group: http://newt.phys.unsw.edu.au/jw/Helmholtz.html Eric Heller’s “Why you hear what you hear” chapter 13: http://www.whyyouhearwhatyouhear.com/subpages/chapter13.html Mountain Ocarinas: http://www.mountainsocarina.com/lessons/lesson02-a7b.html The Bottle Boys website: http://www.thebottleboys.com