ガラスおよびガラス窓の遮音性 : 建築部材の遮音性の研究・第1報

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タイトル別名
  • ON THE SOUND TRANSMISSION LOSS OF SINGLE GLASSES, BI-GRASSES, PAIR GLASSES, SINGLE WINDOWS AND DOUBLE WINDOWS
  • ガラスおよびガラス窓の遮音性-1-
  • ガラス オヨビ ガラス マド ノ シャオンセイ 1

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The sound transmission loss (TL) of single glasses, bi-glasses, pair glasses, single windows and double windows were measured and analized theoretically. The frequency-characteristics of TL of single glasses were coincided with theoretical mass law (A. London) and has the valley of decrease due to coincidence effect (C. Cremer) in high frequency range. TL of bi-glasses were similar to single glass's which had total thickness of glasses used in bi-glasses used in bi-glass, but some increase in all frequency range were observed due to inserted material between glass-plates of bi-glass. On the frequency characteristics of TL of pair glasses, it should be mentioned specially that they have a valley of decrease due to resonance transmission in low frequency range [numerical formula], but in middle frequency range, f>f_r, they were improved considerably more than single glasses, so designation of situation of f_r would be very important to utilize pair-glass efficiently. TL of single windows were analized as they were resulted with the effects of glass and slit-like-opening around the window. And on the common type windows, the effect of openings were more evident, but on the air-tight type windows, the effect of glass were more prominent. On the TL of double windows, the damping effect between two windows is important. Smaller the damping is, lower the TL at resonance frequency, but higher the TL in middle frequency range will be. To lower the effect of damping, to larger the distance, d, between two windows is effective, especialy for the air-tight-type-double window, but for the common-type-double window the damping effect is not so much important as to the effect of the opening.

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