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Physics of Percussion Instruments Drum Shell Bearing Edges Final Talk

Physics of Percussion Instruments Drum Shell Bearing Edges Final Talk. Eric Macaulay Prof. Steve Errede Department of Physics University of Illinois August 8, 2003 emacaula@iwu.edu. Overview. Motivation Methods Results. Motivation. Understanding more about drums

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Physics of Percussion Instruments Drum Shell Bearing Edges Final Talk

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  1. Physics of Percussion InstrumentsDrum Shell Bearing EdgesFinal Talk • Eric Macaulay • Prof. Steve Errede Department of Physics University of Illinois August 8, 2003 emacaula@iwu.edu

  2. Overview • Motivation • Methods • Results

  3. Motivation • Understanding more about drums • Manufacturing better drums • Development of software

  4. Three Bearing Edge Designs • Single 45º -Classic Design • Single 45º w/round over-Modern Design • Double 45º-Experimental Design • Better Energy Transfer

  5. 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 Problems with Drums • Drums are not identical • Different Masses • Different Shell Ply Organization • Different Resonant Frequencies

  6. Recording Shell Sound • Interested in how the shells themselves vibrate. • Nothing attached • Lugs attached • Drum mounted on stand

  7. Progression of Major Shell Harmonics

  8. Recording Drum Sounds • 2 microphones • 1 to monitor overall sound • 1 very close to the shell

  9. Drum Dial (left) measures head tension at each lug. Drum Torque measures torque of each tension rod Record at Different Head Tensions

  10. Testing Tune-ability

  11. Example of 2 Microphone FFT

  12. Shell Mic/Head Mic

  13. FFT Ratio vs. D. D. Tension

  14. A: shell/head B: shell/head C: shell/head A: head/shell B: head/shell C: head/shell

  15. Head FFT with Chebyshev Filter of First Harmonic

  16. Shell FFT with Chebyshev Filter of First Harmonic

  17. Exponential Fit to Standard Deviation of Filtered Data

  18. Time Constants From Curve Fits

  19. Shell/Head Coefficient Ratios of Curve Fits

  20. 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 Conclusions/Acknowledgements Eric Macaulay emacaula@iwu.edu

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