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Journal of the Acoustical Society of America

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Apr 1932

Volume 3, Issue 4, pp. 445-595


NOISE SPECIFICATIONS FOR LARGE REDUCTION GEARS IN TERMS OF PHYSICAL UNITS

E. J. Abbott

J. Acoust. Soc. Am. Volume 3, Issue 4, pp. 445-482 (1932); (38 pages)

Online Publication Date: 13 Jun 2005

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Abstract Unavailable

ON SOUND DIFFRACTION CAUSED BY RIGID CIRCULAR PLATE, SQUARE PLATE AND SEMI‐INFINITE SCREEN

L. J. Sivian and H. T. O'Neil

J. Acoust. Soc. Am. Volume 3, Issue 4, pp. 483-510 (1932); (28 pages) | Cited 1 time

Online Publication Date: 13 Jun 2005

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Abstract Unavailable

LOUDNESS AND INTENSITY RELATIONS

Lloyd B. Ham and John S. Parkinson

J. Acoust. Soc. Am. Volume 3, Issue 4, pp. 511-534 (1932); (24 pages)

Online Publication Date: 13 Jun 2005

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Abstract Unavailable

THE EFFECT OF POSITION ON THE ABSORPTION OF MATERIALS FOR THE CASE OF A CUBICAL ROOM

C. A. Andree

J. Acoust. Soc. Am. Volume 3, Issue 4, pp. 535-551 (1932); (17 pages) | Cited 3 times

Online Publication Date: 13 Jun 2005

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Abstract Unavailable

COMMENTS ON THE THEORY OF HORNS

William M. Hall

J. Acoust. Soc. Am. Volume 3, Issue 4, pp. 552-561 (1932); (10 pages) | Cited 1 time

Online Publication Date: 13 Jun 2005

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The present theory of horns makes a number of assumptions and approximations relative to the nature of the motion within the horns. This paper discusses these assumptions and presents the results of an experimental investigation of the sound fields within a conical and an exponential horn. These results show the conditions actually existing in these particular cases, and therefore indicate to a certain extent the validity of the above assumptions and approximations.

ON INTERFERENCE ELIMINATION WITH THE WARBLE TONE

W. L. Barrow

J. Acoust. Soc. Am. Volume 3, Issue 4, pp. 562-578 (1932); (17 pages)

Online Publication Date: 13 Jun 2005

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The effect of a frequency modulated tone, also called warble tone, in eliminating the disturbing space and time interference phenomena which accompany the use of a single tone in objective acoustical measurements is discussed. A criterion for determining the minimum allowable frequency variation is set up, this being that the frequency change should be just large enough to shift the relative phase of direct and reflected sound waves through 180°.Based on this criterion the relative change of frequency is derived in terms of the original frequency and the path difference L, where L denotes the difference in distances from source to transmitter travelled by the direct and reflected sound waves. The warble tone may be represented by:
math
It is then shown that the effectiveness of the warble tone depends upon the path difference L and upon the middle frequency f0. A desirable value for L is found to be L≧3λ0, where λ0 = v/f0 (v = velocity of sound in air) is the wave length corresponding to f0. While Δf/α alone is the controlling factor for the frequency spectrum of the warble tone, its suitableness for acoustic purposes is governed instead by Δf/f0. It is demonstrated that a very slow frequency variation through a given band may be replaced by several simultaneous equal amplitude components arranged symmetrically with that band, provided the band width and location are given the proper value corresponding to the particular value of L. The standing waves (R.M.S. value) produced by a warble tone are calculated and illustrated on an example, from which the above consequences are made more obvious. The standing waves of simultaneous equal amplitude tones are also shown. The factors governing the elimination of transient interference with the warble tone are found to be the same as those valid for the elimination of standing waves.

INVESTIGATION OF GAMMA IN A MIXTURE OF GASES

Garnett F. Barnes

J. Acoust. Soc. Am. Volume 3, Issue 4, pp. 579-590 (1932); (12 pages)

Online Publication Date: 13 Jun 2005

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The velocity of ultra‐sonic vibrations was measured in gas mixtures and from this data the ratio of the molecular heats of the mixture was calculated. The vibrations were produced by a quartz crystal driven by a thermionic oscillator. The method employed was essentially that used by G. W. Pierce.
Mixtures of carbon dioxide and helium, air and helium, oxygen and helium, and nitrous oxide and helium were used. The molecular heat at constant pressure was taken from the International Critical Tables and the molecular heat at constant volume of the gas mixtures calculated.
It was found that the ratio of the two molecular heats of the gas mixtures as determined by experiment agrees well with that obtained by calculation.

THE MATHEMATICAL THEORY OF VIBRATING MEMBRANES AND PLATES

R. C. Colwell and J. K. Stewart

J. Acoust. Soc. Am. Volume 3, Issue 4, pp. 591-595 (1932); (5 pages)

Online Publication Date: 13 Jun 2005

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Abstract Unavailable
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