[논문]Rayleigh′s Acoustical Research on the Fog Signal

Ku, Ja Hyon

Rayleigh′s Acoustical Research on the Fog Signal 원문보기

The journal of the Acoustical Society of Korea, v.23 no.3E, 2004년, pp.98 - 102

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In 1896, Rayleigh was appointed as Scientific Advisor of the Trinity House. Rayleigh applied his knowledge of sound to developing effective fog signals during his IS-year tenure at the maritime organization. Rayleigh's expertise on acoustics met an appropriate field for its application during his improvement of the fog signal for the institution. Rayleigh's activities at the Trinity House were motivated by his desire to make contribution to the public. During his research on the fog signal, Rayleigh effectively employed his expertise acquired through his mathematical and experimental research on sound and vibration since the 1860s. Rayleigh developed effective horns for emitting fog signals and proposed various ways of overcoming the weaknesses of sound signals available at that time. While attempting to solve the problem of the attenuation of sound signals disseminating through the air, Rayleigh put foundations of atmospheric acoustics by developing new scientific theories about it.

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Rayleigh thought that this reflection would be caused by irregular layers somewhat sharply defined in the medium. He guessed that the rising flux of heated air might produce these reflective surfaces. Rayleigh criticized Taylorfs eddying motion theory in that Taylor considered neither dissipation nor reflection and pointed out if there were the eddying motion disturbing the sound transmission, the velocity of the sound wave would be decreased at some points in the vortex and be increased at other points, so that the total effect would be the same as if no vortex existed.
Rayleigh thought that this reflection would be caused by irregular layers somewhat sharply defined in the medium. He guessed that the rising flux of heated air might produce these reflective surfaces. Rayleigh criticized Taylorfs eddying motion theory in that Taylor considered neither dissipation nor reflection and pointed out if there were the eddying motion disturbing the sound transmission, the velocity of the sound wave would be decreased at some points in the vortex and be increased at other points, so that the total effect would be the same as if no vortex existed.

제안 방법

Rayleigh's research on the fog signal focused mostly on how to transmit sound farther and more clearly in fog. He investigated various ways of sending sound farther and made efforts to remove obstacles to the transmission of the sound signal. He devised new and effective sound sources for the fog signal and proposed effective ways of picking up fog signals.
Rayleigh's research on the fog signal focused mostly on how to transmit sound farther and more clearly in fog. He investigated various ways of sending sound farther and made efforts to remove obstacles to the transmission of the sound signal. He devised new and effective sound sources for the fog signal and proposed effective ways of picking up fog signals.
His investigation stopped at this step since he did not regard physiological acoustics as his research area. Nevertheless, his investigation was fruitful in that he identified a new and practical method of strengthening the fog signal by using the beats.
His investigation stopped at this step since he did not regard physiological acoustics as his research area. Nevertheless, his investigation was fruitful in that he identified a new and practical method of strengthening the fog signal by using the beats.
Rayleigh's concern with how to lengthen the reach of the fog signal led him to pioneer a new field of atmospheric acoustics by reflecting on the cause of the loss of sound transmitted through the air. In 1899, Rayleigh noted Wilmar Duffs observation, which showed that the processes of absorption of sound described by G.
Rayleigh's concern with how to lengthen the reach of the fog signal led him to pioneer a new field of atmospheric acoustics by reflecting on the cause of the loss of sound transmitted through the air. In 1899, Rayleigh noted Wilmar Duffs observation, which showed that the processes of absorption of sound described by G.

참고문헌 (14)

R. J. Strutt, Life of John William Strutt, Third Baron Rayleigh, O.M., F.R.S., Edward Arnold, New York, 1924; 2nd augmented, Madison, Wisconsin, 1968
J. W. S. Rayleigh, The Theory of Sound, 2 vols. Dover, New York, 1945
R. B. Lindsay, 'Strutt, John William, Third Baron Rayleigh,' in C. C. Gillispie, ed. Dictionary of Scientific Biography, Scribner, New York, 1972, 13, pp. 100-107
D. W. Kim, Leadership and Creativity: A History of the Cavendish Laboratory, 1871-1919, Kluwer Academic Publishers, Boston, 2002
H. P. Mead, Trinity House, Sampson Law, London, 1947
J. W. S. Rayleigh, 'Acoustical Notes VI,' Phil. Mag. 2, pp. 280-285, 1901
J. W. S. Rayleigh, 'Interference of Sound,' R. Inst. Proc. 17, pp. 1-7, 1902
J. H. Ku, 'A Historical Inquiry about Rayleigh's Research on the Perception of the Direction of Sound,' J. Acoust. Soc. Kor.(Korean) 21, pp. 695-702, 2002
J. W. S. Rayleigh, 'On Our Perception of Sound Direction,' Phil. Mag. 13, pp. 214-232, 1876
J. W. S. Rayleigh, 'On the Cooling of Air by Radiation and Conduction, and on the Propagation of Sound,' Phil. Mag. 47, p. 314, 1899

상세보기
Acoustics, Springer-Verlag, New York, 1999, p. 191-2R. T. Beyer, Sounds of Our Times: Two Hundred Years of
J. W. S. Rayleigh, 'On the Attenuation of Sound in the Atmosphere,' Advisory Committee of Aeronautics, Aug. 1916
R. T. Beyer, Sounds of Our Times: Two Hundred Years of Acoustics, Springer-Verlag, New York, 1999, p. 196
J. W. S. Rayleigh, 'Memorandum on Fog Signals,' Report to Trinity House, 1916

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Rayleigh′s Acoustical Research on the Fog Signal 원문보기

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