________ Vibrating Drum Head
A drum head is a circular vibrating membrane restricted by the condition that it's movement and position at the edges is zero. The solution to the partial differential equation that describes its modal vibration is given by Bessel functions.
Pick a different time in the drum's cycle of oscillation to see the deformation in the surface at that time.
Pick a different mode to see how higher order modes resonate on the drum's surface. The n=1 mode will be dominant, but higher modes result in harmonics in tone.
The mode looks like this: