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Journal of the Acoustical Society of America

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Oct 1972

Volume 52, Issue 4A, pp. 1069-1093


Editorial: Manuscripts for the JJOURNAL

R. Bruce Lindsay

J. Acoust. Soc. Am. Volume 52, Issue 4A, pp. 1069-1070 (1972); (2 pages)

Online Publication Date: 12 Aug 2005

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Wedge Design for National Bureau of Standards Anechoic Chamber

Walter Koidan, Gale R. Hruska, and Marshall A. Pickett

J. Acoust. Soc. Am. Volume 52, Issue 4A, pp. 1071-1076 (1972); (6 pages) | Cited 4 times

Online Publication Date: 12 Aug 2005

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Design techniques for anechoic room wedges must always be used with caution because of the possibility that a manufacturer may change the properties of the material. This paper describes efforts at the National Bureau of Standards to adapt to relatively new glass wool manufactured in the United States. A “hybrid” wedge designed for a large anechoic chamber at NBS consists of glass wool of two densities: 3 lb/ft3 for the 55‐in.‐long tapered portion and 1.1 lb/ft3 for the 11‐in.‐long base. Experimental evidence indicates that the light‐weight material and the 4‐in air space behind the wedge, in conjunction with the heavier material, serve to produce a useful resonance absorption. The “cutoff frequency” attained for the 70‐in.‐long structure was about 45 Hz as measured in a 31‐ft plane‐wave tube. Normal acoustic impedance measurements looking into the wedge from the tip were made for the hydrid wedge and a half‐scale model.

On the Effect of Initial Stress on the Propagation of Flexural Waves in Elastic Rectangular Bars

J. A. Clark, A. J. Durelli, and P. A. Laura

J. Acoust. Soc. Am. Volume 52, Issue 4A, pp. 1077-1086 (1972); (10 pages)

Online Publication Date: 12 Aug 2005

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The dynamics of continuous media subjected to initial stress is of great interest in several fields of applied science and technology: geophysics, oceanography, underwater acoustics, and structural design. Pioneering analytical work in this field was done by M. A. Biot. Few contributions have been made, however, to the experimental treatment of the problem of determining dynamic stress distributions within statically prestressed continuous media. This study deals with an experimental analysis of the propagation of flexural waves in prismatic elastic bars with and without prestressing. The effects of prestressing by axial tension, axial compression, and pure bending are illustrated. Comparisons are made with an approximate theory. The results are extended to bars of other materials by scaling laws.
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Infrasound in the Ionosphere Generated by Severe Thunderstorms

K. Davies and J. E. Jones

J. Acoust. Soc. Am. Volume 52, Issue 4A, pp. 1087-1090 (1972); (4 pages)

Online Publication Date: 12 Aug 2005

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Radio observations of ionospheric perturbations have revealed an association between severe thunderstorms and infrasonic pressure waves that propagate through the F region at heights of 200 to 400 km. These waves are characterized by periods of 3.5 and 4.5 min. An acoustic ray‐tracing method is described, which is used to locate the sources of the infrasonic waves.

Applications of Aerospace Technology in Biomedicine: Patient Monitoring

J. Acoust. Soc. Am. Volume 52, Issue 4A, pp. 1090-1091 (1972); (2 pages)

Online Publication Date: 12 Aug 2005

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Abstract Unavailable

New Standard Issued on Audiometer Calibration

J. Acoust. Soc. Am. Volume 52, Issue 4A, pp. 1091-1091 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Computer Given Voice on Assembly Line

J. Acoust. Soc. Am. Volume 52, Issue 4A, pp. 1091-1092 (1972); (2 pages)

Online Publication Date: 12 Aug 2005

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Scattering of Sound from Layered Hollow Elastic Cylinders

J. E. Tepera

J. Acoust. Soc. Am. Volume 52, Issue 4A, pp. 1092-1092 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Low Temperature Ultrasonic Attenuation and Velocity Studies in Metals

J. Trivisonno, Jr.

J. Acoust. Soc. Am. Volume 52, Issue 4A, pp. 1092-1092 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Supersonic Absorption in Gases

H. H. Keller

J. Acoust. Soc. Am. Volume 52, Issue 4A, pp. 1092-1092 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Acoustical Diffraction Radiation

H. Levine

J. Acoust. Soc. Am. Volume 52, Issue 4A, pp. 1092-1092 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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Propagation of Finite Amplitude Acoustic Waves in Nonlinear Relaxing Fluids

R. Klinman and L. A. Kraus

J. Acoust. Soc. Am. Volume 52, Issue 4A, pp. 1092-1092 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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A Method for the Experimental Study of Vibrational Nonequilibrium Using Resonant Radiatively Driven Acoustic Waves

R. C. Lind

J. Acoust. Soc. Am. Volume 52, Issue 4A, pp. 1092-1093 (1972); (2 pages)

Online Publication Date: 12 Aug 2005

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Numerical Calculations of the Near Field for Spherically Symmetric Nonlinear Acoustic Flows in an Unbounded Ideal Gas

G. M. Muller

J. Acoust. Soc. Am. Volume 52, Issue 4A, pp. 1093-1093 (1972); (1 page)

Online Publication Date: 12 Aug 2005

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