Bulletin Volume 4, Nos. 19-25

Bulletin Volume 4, Nos. 19-25

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ...absorbed, and transmitted in varying amounts, depending upon the physical characteristics of the material of the medium and its structure. If channels or pores exist, there is dissipation because of viscosity and heat conduction. There are also inelastic flexural yielding of the reflecting surface, inelastic compression, and inelastic flexure of the minute structural parts of the material. It is thus not easy to interpret experimental results on reflection, absorption and transmission, and theoretical considerations have peculiar difficulties. The accompanying statement of specific problems in the first two instances presents aspects chiefly of scientific interest. The third states the most desirable next development in the applied field of architectural acoustics. (1) A theoretical solution of the problem of the reflection of a compression wave from a non-elastically yielding surface should be developed to account for the shape of the absorption curves already obtained, and to predict absorption coefficients from mechanical properties. (2) A study should be made of the reflection, absorption and transmission of sound by various materials under ideal conditions in which the effects of the different factors may be separated and their magnitudes determined separately. This study should include a consideration of the physical properties of density, stiffness, damping and porosity with a view to the development of a suitable mechanical theory. (3) The study of the transmission of sound through actual building constructions, the tests being carried out under conditions approximating those found in standard practice. In these tests, distinction should be made between the case in which the sound passes from the air through the partition, and that in...show more

Product details

  • Paperback | 178 pages
  • 189 x 246 x 10mm | 327g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236540751
  • 9781236540751