Abstract
The properties of a vibrating gum rubber dam membrane are compared to those of an ideal membrane. The modes of vibration, obtained by driving the membrane at controlled frequencies in the steady state, are identified by employing chladni patterns and by observing phase differences over the surface with a microphone probe. The frequencies thus obtained are measured at different tensions of the membrane and the wave velocity is calculated and plotted as a function of frequency. The deviations from theory are discussed.
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