Post on 30-Dec-2015
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Physics of Percussion InstrumentsDrum Shell Bearing Edges
Final Talk• Eric Macaulay• Prof. Steve Errede
Department of Physics
University of Illinois
August 8, 2003
emacaula@iwu.edu
Three Bearing Edge Designs
• Single 45º -Classic Design
• Single 45º w/round over-Modern Design
• Double 45º-Experimental Design
• Better Energy Transfer
Problems with Drums
• Drums are not identical
• Different Masses• Different Shell Ply
Organization• Different Resonant
Frequencies
Drum Shell Weight
Rim Weight
A - Single 45º 491±1g 590±1g
B - Single 45º w/round-over
461±1g 598±1g
C - Double 45º 444±1g 660±1g
Recording Shell Sound
• Interested in how the shells themselves vibrate.
• Nothing attached• Lugs attached• Drum mounted on
stand
Record at Different Head Tensions
• Drum Dial (left) measures head tension at each lug.
• Drum Torque measures torque of each tension rod
Conclusions/Acknowledgements
• The double 45 degree bearing edge appears to be better and transferring energy
• More evidence is required
• More drums• More testing
• Special thanks to Prof. Steve Errede
• Jack Boparai• Lee Holloway• Mats Selen• Nicole Drummer• Dennis at Phattie
Drums
Eric Macaulayemacaula@iwu.edu