Why Does a Guitar Need a Body to Make Sound?raata/Conference_files/Inta_TTU_PhysicsBanquet... ·...
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Why Does a Guitar Need a Body to Make Sound? Ra Inta, Texas Tech University
Transcript of Why Does a Guitar Need a Body to Make Sound?raata/Conference_files/Inta_TTU_PhysicsBanquet... ·...
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Why Does a Guitar Need a Body to Make Sound?
Ra Inta, Texas Tech University
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Making guitars…
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The Experimental Instruments
Western Red Cedar Sitka Spruce Engelmann Spruce
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… and measuring guitars
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“I’ve seen guitars without bodies”
Electric guitars don’t count!
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The Helmholtz resonator
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Where is the ‘throat’ of the resonator?
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It’s the end ‘correction’!
RR 85.0~3
8'
Here: R=48.0 mm So: l’ ~ 41 mm (each side)
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Helmholtz resonance of this guitar
Volume: 16.60 litres = 1.66×10-2 m3 Radius of soundhole: 48.0 mm Calculated fH: 122.1 Hz Measured fH: 120.0 Hz
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Coupled oscillators
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A circuit diagram of the guitar!
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Coupled resonators split frequencies
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Vibrations of the sound-board (top)
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Thanks for listening!