The (0,2) mode has one nodal diameter, or node in the form of a circle where the surface does not move. The nodal point run the diameter of the drum at right angles to each other, making a large X. The (2,1) mode vibrates at aĢ.135 times the frequency of the (0,1) mode. This is the second most important vibrational mode in terms of the musical quality of the drum. The third main mode of vibration of a circular membrane is the (2,1) mode. The (1,1) mode vibrates at aġ.593 times the frequency of the (0,1) mode, and the nodal point runs the diameter of the drum. Vibrational mode in terms of the musical quality of the drum. The second mode of vibration of a circular membrane is the (1,1) mode. It sounds like a deep "thump." The vibrations occur at the lowest frequency of all of the drum vibrational modes. This is the mode that is excited when the drum is struck in the center of the membrane.
The first or the fundamental mode of vibration of a circular membrane is the (0,1) mode. Click on the picture to see an animation of each mode. The scheme involves counting the number of directions (0 means it goes in all directions) and the number of nodal rings. A mathematical language has been developed to define the different resonant vibrational mode patterns in a circular membrane. Drums resonate in various ways, creating different vibrational patterns.
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