Descrição

The ISO 8297:1994 has been used successfully to find out the Sound Power Level of different
industries during more than 20 years, however the standard includes some limitations, namely: a) the
assumption of a sound reflector type of ground (sound absorption coefficient = 0); b) the application
only to industries without many obstacles; c) the assumption of a parallelepiped surface instead of a
spherical surface; d) the method it is limited to industries with the largest horizontal dimension not
bigger than 320 meters; e) attenuation terms, due to atmospheric absorption, based on ISO 3891:1978
and not on the latest associated standard ISO 9613-1:1993. Thereby, the aim of this article is to
analyze the consequences of ISO 8297:1994 limitations, found by the authors during the work
development, and present, justifiably, associated proposals to complement and/or improve the
standard.