4/11/2024 0 Comments Diffraction soundThe pressure at the point in the median plane farthest away from the source of sound (θ = 180°) is substantially equal to the freeâfield pressure only for ka < 5. There is a marked similarity between the results obtained for this finite cylinder and the results obtained for a sphere. In the case of the cylinder whose axis was oriented parallel to the wave front of the incident wave and whose length was chosen to equal its diameter, the pressures were measured for the most part in the median plane. This comparison of experiment with theory affords a valuable means of estimating the validity of the experimental procedure. In particular, the existence of the âbrightâ spot diametrically opposite the point nearest the sound source was verified experimentally. In the case of the sphere, reasonably good agreement was obtained between theory and experiment in the range of 1 3 <â10â , where k is the wave number of the incident wave and a the radius of the obstacle. The sound pressures p on the surface are conveniently expressed relative to the freeâfield pressure p 0 in the undisturbed incident wave. ![]() A small probe microphone was used to measure the sound pressures on the surface of the obstacles in a room essentially free from acoustic wall reflections under a variety of experimental conditions. ![]() The results of calculations of the pressure distribution on the surface of a stationary rigid sphere and a stationary rigid circular cylinder of infinite length, when exposed to a plane progressive sound wave, are compared with experiment.
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