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Vibrational Modes of the (1,1) Mode
The second mode of vibration of a circular membrane is the (1,1) mode. This is the most important vibrational mode in terms of the musical quality of the drum. The (1,1) mode vibrates at a freqeuncy 1.593 times the frequency of the (0,1) mode, and the nodal point runs the diameter of the drum.
In this mode, the membrane is acting as a dipole vibrational sound source. As a dipole, the air that is being pushed out by the drum can simply move over and fill the space on the other side. Forcing the air back and forth takes much less energy than the (0,1) mode and, therefore, the vibrations decay much more slowly than with the (0,1) mode. This longer decay means the drum will resonate and, therefore, create a sound that continues for up to several seconds, giving the drum a musical quality.
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
Aristotle Copernicus Einstein Fibonacci Hermann von Helmholtz Kepler Sir Isaac Newton Max Planck Ptolemy Pythagoras Thomas Young
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