| Popis: |
Two single-number quantities are used now in Russia: weighted sound reduction index for rating air noise insulation by internal protecting designs of buildings and the quantity, characterizing sound insulation of external transparent protecting designs from noise, created by municipal transportation streams. For other sound insulation characteristics determined by International Standards ISO 10140-2, ISO 140-4, and ISO 140-5, the corresponding single-number quantities are not established in the Russian standard documents. Besides methods for determination of single-number quantities to be used differ by their various physical senses too. It causes expediency of introduction of International Standard ISO 717-1 in which the corresponding single-number quantities are entered for all spectral characteristics, put into practice of air noise insulation by building protecting designs, and universal methods of their determination are stated. In this paper, features of introduction of International Standard ISO 71... |
