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Vibrational Modes of the (2,1) Mode
The third main mode of vibration of a circular membrane is the (2,1) mode. This is the second most important vibrational mode in terms of the musical quality of the drum. The (2,1) mode vibrates at a freqeuncy 2.135 times the frequency of the (0,1) mode. The nodal point runs the diameter of the drum at right angles to each other, making a large X.
The (2,1) mode acts as a four pole sound vibration source, which is less efficient at radiating sound energy than the (1,1) dipole mode and very much less than the (0,1) monopole mode. The lower efficiency explains why the (2,1) mode takes longer to decay, making it an important component of the musical quality of the drum.
Longitudinal Wavelength Sound Waves Pitch and Frequency Speed of Sound Doppler Effect Sound Intensity and Decibels Sound Wave Interference Beat Frequencies Binaural Beat Frequencies Sound Resonance and Natural Resonant Frequency Natural Resonance Quality (Q) Forced Vibration Frequency Entrainment Vibrational Modes Standing Waves Law of Octaves Psychoacoustics Tacoma Narrows Bridge Schumann Resonance Animal BioAcoustics More on Sound
Law Of Octaves Sound Harmonics Western Musical Chords Musical Scales Musical Intervals Musical Mathematical Terminology Music of the Spheres Fibonacci Sequence Circle of Fifths Pythagorean Comma
DrumsDrum Vibrational Modes
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