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6 Shocks and Surprises: Refining the Elementary Model
6.7.3 Some Experimental Tests of Vibroacoustic Modelling
Fig. 6.40 (a) Clarinet artificial mouth sounding a sliding tube with a thin-walled brass extension.
(b) Brass and plastic extension tubes used in experiment. Courtesy of Guillaume Nief
A study reported by Nief et al. (2008) was designed to provide experimental
confirmation of the predictions of the vibroacoustic model described in Sect. 6.7.2.
The object of study was a clarinet-like instrument (a pure cylindrical tube adapted
with a clarinet mouthpiece) designed to show obvious wall vibration effects on
radiated sounds. A clarinet-like instrument was chosen because it was easy to model
and readily playable using an artificial mouth (Fig. 6.40).
The influence of wall vibrations on the input impedance Z is described by the
correction factor C defined in Eq. 6.47. Since this correction factor is very small for
normal wind instrument tubes, no significant effect of wall vibration is generally
observed. To determine the geometrical characteristics and material of a tube whose