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Copy of Helmholtz carousel

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Lada Zuzjak

on 3 April 2013

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Transcript of Copy of Helmholtz carousel

Attach Christmas tree balls on a low friction mounting (carousel) such that the hole in each ball points in a tangential direction. If you expose this arrangement to sound of a suitable frequency and intensity, the carousel starts to rotate. Explain this phenomenon and investigate the parameters that result in the maximum rotation speed of the carousel. Thank you for Your attention * http://www.phys.unsw.edu.au/jw/Helmholtz.html Bibliography Velocity as a function of frequency Acceleration in carousel 328Hz Reading data from the sensor Model of the nonlinear Helmholtz resonator Reason for moving My carousel t [s] Acceleration in carousel 319Hz Velocity as a function of sound level Comparing the velocity as a function of time for different frequencies Acceleration in carousel 309Hz Optimal point of the connection SENSOR Rotation sensor - reflective optocoupler Wojciech Grędel 12. Helmholtz carousel Speed measuring system ROTATION SENSOR DISC NEEDLE LOUDSPEAKER POWER SUPPLY Resonant frequency Resonant frequency according to the temperature How does it work? Spectral analysis Velocity dependence of lenght częstotliwość zmierzona - 263 Hz częstotliwosć wyliczona - 403 Hz z uwzględnieniem efektywnej długosci - 257 Hz * http://www.vibrationdata.com/Newsletters/January2004_NL.pdf Neck impedance seen from the cavity Teoria powstawania siły odrzutu Amplituda drgań Prędkość drgajacego powietrza Amplituda ciśnienia akustycznego Siła działajaca na bombkę * K. Uno Ingard. Notes on Acoustics (Infinity Science Press, 2008) * Ricardo R. Boullosa and Felipe Orduña-Bustamante. The reaction force on a Helmholtz resonator driven at high sound pressure amplitudes. Am. J. Phys. 60, 8, 722-726 (1992) Problem No. 12 beacuse where where The damping coefficient
and the effective mass Thermodynamic process occuring in
the resonator The Equation of motion of the mass Solution to the equations of motion * M. L. Munjal, Acoustics of Ducts and Mufflers: With Application to Exhaust and Venilation System Design (Wiley, New York, 1987) * J. W. Strutt (Lord Rayleigh), The Theory of Sound (Dover, New York, 1945, Reprint, Vol. I) center - 2,38 Hz neck - 2,28 Hz back - 2,49 Hz Carousel velocity Force on my carousel Experimental part Theoretical part How to increase velocity? short connection between the balls
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