THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN
Online ISSN : 2432-2040
Print ISSN : 0369-4232
Search
Advanced search
OR
Browse
Search
Volume 15, Issue 4
Displaying 1-8 of 8 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • An Analysis of Acoustic Matching Sections
    Mikio Nakatsuyama
    Article type: Article
    1959 Volume 15 Issue 4 Pages 217-223
    Published: December 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.4_217
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    In this report the tapered acoustic matching section was mainly analysed. On making appropriate assumptions, matching section may be considered as an inhomogeneous transmission line and its reflection factor can be calculated by solving the nonlinear differential equation of the inhomogeneous transmission line with a numerical solution, and the effect of a spacial part of the acoustic matching section can be analysed by utilizing the same, but by a simplified differential equation. By considering the frequency characteristic of acoustic matching sections, the author found the designing method of a broad-band acoustic matching section, by making the reflection factor sufficiently small with a choice of suitable length of a spacial part and an attenuation part at the lowest frequency.
    View full abstract
    Download PDF (617K)
  • Experiment on Acoustic Radiation Pressure Meter
    Katsuo Negishi, Otohiko Nomoto
    Article type: Article
    1959 Volume 15 Issue 4 Pages 224-230
    Published: December 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.4_224
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Theoretical considerations have been performed for obtaining the energy density of the incident ultrasonic beam by measuring the acoustic radiation pressure on large objects in comparison to the wave-length of sound. Experiment has been performed by employing a balance-type radiometer and by employing spheres, cones of vertex angles of 60°, 90° and 120°, and plane discs made of different materials --- iron, brass, duralmin, bakelite and polystyrene --- as objects for measuring the radiation pressure. It has been observed that the spheres give constant and common values of the radiation pressure irrespective of the materials, and that they are satisfactory for absolute measurements. Iron and brass cones with vertex angle of 90° have given good results, too.
    View full abstract
    Download PDF (611K)
  • On the Sound Directivity and Sound Transmission of Circular or Slit-Like Openings of Diffused Sound Field
    Shin-ichi Kuga
    Article type: Article
    1959 Volume 15 Issue 4 Pages 231-239
    Published: December 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.4_231
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    In an another report, under the assumption that the opening from a diffused sound field has the nature as though it is a plane-like assembly of non-directional point source, the author analysed the sound intensity attenuation along the perpendicular centre line from circular and slit-like opening of diffused room, and then proved experimentally that the logical formula of attenuation being applicable resonable for diffused sound of all frequencies. In this report, the author investigated sound directivities of sound radiation from the openings of diffused room, and sound transmission through them, experimentally and theoretically. From this investigation, the author illustrated that the sound directivity of sound radiation is non-directivity for low-frequency and for high frequency range, (ka≫1) the cosθ law is applicable, and that the sound transmission loss of the opening is zero for high frequency but for low frequency (ka<0. 5) the transmission loss of the openings cannot be neglected. Thus, the openings of diffused sound field show comparatively simple natures to free field and the application of its nature to architectural noise control is made with ease with wide application.
    View full abstract
    Download PDF (1327K)
  • Effects of Sound Absorbing Materials in a Muffler:Part 1. Effects of absorption in cavity wall on the high frequency sound
    Motokazu Fukuda, Ken'iti Kido, Tadamoto Nimura
    Article type: Article
    1959 Volume 15 Issue 4 Pages 239-243
    Published: December 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.4_239
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Theoretical formula is induced, in this paper, to express what effect is obtainable when the inner wall of a muffler is made absorptive. And an experiment is carried on to examine the theory induced here. The muffler with absorptive wall designed by one of the authors is shown in the last.
    View full abstract
    Download PDF (422K)
  • [title in Japanese]
    [in Japanese], [in Japanese]
    Article type: Article
    1959 Volume 15 Issue 4 Pages 244-248
    Published: December 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.4_244
    JOURNAL FREE ACCESS
    Download PDF (456K)
  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1959 Volume 15 Issue 4 Pages 249-255
    Published: December 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.4_249
    JOURNAL FREE ACCESS
    Download PDF (1142K)
  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1959 Volume 15 Issue 4 Pages 256-258
    Published: December 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.4_256
    JOURNAL FREE ACCESS
    Download PDF (257K)
  • [title in Japanese]
    Article type: Article
    1959 Volume 15 Issue 4 Pages 285-
    Published: December 30, 1959
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.15.4_285
    JOURNAL FREE ACCESS
    Download PDF (168K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top