Normal Modes of a Circular Drum Head

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This Demonstration illustrates the normal vibrational modes of a drum head fixed along a circular edge. Each mode with elongation (in polar coordinates) is related to Bessel functions of the first kind, , where is the radial coordinate, the polar angle, and the time. Selecting the order, , determines the angular periodicity of the drum head. Selecting the zero of determines the number of antinodes along a radial line connecting the center and outer edge.

Contributed by: Adam Smith (March 2011)
Open content licensed under CC BY-NC-SA




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