lecture21 - Percussion Instruments 1. Classification...

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Unformatted text preview: Percussion Instruments 1. Classification Idiophones (xylophone, marimba, chimes, cymbals, gongs) Membranophones (drams) Aerophones (whistles, sirens) Chordophones (piano, harpsichord) Some have definite pitch, other do not have definite pitch Types of vibration A) Mechanical: bars membranes plates strings (produce harmonic overtones) B) Pneumatic: air columns (produce harmonic overtones) air chambers 2. Vibrations of bars Longitudinal vibrations Transverse vibrations A) Longitudinal vibrations (aluminum stroke rods) Harmonic modes (similar to a pipe with both ends open) E Youngs modulus, density. It is possible selectively excite desired mode by clamping at the location of one of the nodes for the particular mode. Longitudinal vibration are much higher in frequency then transverse. L nv v f n L L n n n n 2 / / 2 2 / = = = = / E v = Example: L=61cm, v=5100m/s ( 29 ( 29 hz m s m L v f 1480 61 . 2 / 5100 2 / 1 = = = B) Transverse vibrations (almost always) Boundary conditions Free (almost always) Clamped Simply supported Modes are not harmonic (because of that description is more complicated).(because of that description is more complicated)....
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lecture21 - Percussion Instruments 1. Classification...

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