Journal ArticleDOI
Sound Diffraction by Rigid Spheres and Circular Cylinders
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In this article, the results of calculations of the pressure distribution on the surface of a stationary rigid sphere and an infinite length stationary rigid circular cylinder of infinite length, when exposed to a plane progressive sound wave, are compared with experiment.Abstract:
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. 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 sound pressures p on the surface are conveniently expressed relative to the free‐field pressure p0 in the undisturbed incident wave.In the case of the sphere, reasonably good agreement was obtained between theory and experiment in the range of 13 <ka < 10, where k is the wave number of the incident wave and a the radius of the obstacle. In particular, the existence of the “bright” spot diametrically opposite the point nearest the sound source was verified experimentally. This comparison of experiment with theory affords a valuable means of estimating the validity of the ...read more
Citations
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Journal ArticleDOI
Range dependence of the response of a spherical head model
TL;DR: In this article, a theoretical and experimental investigation of the head-related transfer function (HRTF) for an ideal rigid sphere was performed, and an algorithm was developed for computing the variation in sound pressure at the surface of the sphere as a function of direction and range.
Interaction of Plane Waves with Vertical Cylinders
TL;DR: In this paper, the interaction of linear, plane water waves with stationary groups of rigid, vertical, circular cylinders under conditions in which the inertial forces on the cylinders dominate over the drag forces was studied.
Book ChapterDOI
Models of External- and Middle-Ear Function
TL;DR: Physical schemata serve two purposes: they crystallize understanding of how the structures work and provide testable hypotheses for further refinements, and they supply approximations of external- and middle-ear function which can act as prefilters in studies of the inner ear and central auditory nervous system.
Journal ArticleDOI
Propagation of propeller tone noise through a fuselage boundary layer
Donald B. Hanson,B. Magliozzi +1 more
TL;DR: In this article, a new three-dimensional theory is described that treats the combined effects of refraction and scattering by the fuselage and boundary layer, and the complete wave field is solved by matching analytical expressions for the incident and scattered waves in the outer flow to a numerical solution in the boundary layer flow.