Abstract
The resonance frequency shift of an acoustic rectangular chamber due to the pressure of a rigid sphere has been measured for the n = 1, 2 modes as a function of sphere size and position. The position dependence has sinusoidal and dc components. A simple excluded volume model and boundary perturbation theory were used to explain the data. The calculations can account for the sinusoidal behavior, but not for the dc shift. Also measured were the frequency shift, due to a thin disk of the same cross section and a cylinder of the same cross section and volume as the sphere, and the p2/p1 ratio at the wall as a function of sphere position. [Work supported by NASA.]
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