Physics of percussion instruments drum shell bearing edges final talk
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Physics of Percussion Instruments Drum Shell Bearing Edges Final Talk. Eric Macaulay Prof. Steve Errede Department of Physics University of Illinois August 8, 2003 [email protected] 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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Physics of percussion instruments drum shell bearing edges final talk

Physics of Percussion InstrumentsDrum Shell Bearing EdgesFinal Talk

  • Eric Macaulay

  • Prof. Steve Errede

    Department of Physics

    University of Illinois

    August 8, 2003

    [email protected]


Overview

Overview

  • Motivation

  • Methods

  • Results


Motivation

Motivation

  • Understanding more about drums

  • Manufacturing better drums

  • Development of software


Three bearing edge designs

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

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


Recording shell sound

Recording Shell Sound

  • Interested in how the shells themselves vibrate.

  • Nothing attached

  • Lugs attached

  • Drum mounted on stand


Progression of major shell harmonics

Progression of Major Shell Harmonics


Recording drum sounds

Recording Drum Sounds

  • 2 microphones

  • 1 to monitor overall sound

  • 1 very close to the shell


Record at different head tensions

Drum Dial (left) measures head tension at each lug.

Drum Torque measures torque of each tension rod

Record at Different Head Tensions


Testing tune ability

Testing Tune-ability


Example of 2 microphone fft

Example of 2 Microphone FFT


Shell mic head mic

Shell Mic/Head Mic


Fft ratio vs d d tension

FFT Ratio vs. D. D. Tension


Physics of percussion instruments drum shell bearing edges final talk

A: shell/head

B: shell/head

C: shell/head

A: head/shell

B: head/shell

C: head/shell


Physics of percussion instruments drum shell bearing edges final talk

Head FFT with Chebyshev Filter of First Harmonic


Shell fft with chebyshev filter of first harmonic

Shell FFT with Chebyshev Filter of First Harmonic


Exponential fit to standard deviation of filtered data

Exponential Fit to Standard Deviation of Filtered Data


Time constants from curve fits

Time Constants From Curve Fits


Shell head coefficient ratios of curve fits

Shell/Head Coefficient Ratios of Curve Fits


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

Conclusions/Acknowledgements

Eric Macaulay

[email protected]


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