Declared noise emission values of machinery and equipment based on determination of the combined standard deviation

Ari Saarinen

Research output: Contribution to journalArticle

3 Citations (Scopus)


The declared noise emission values determined according to the international standards seem to depend on the frequency distribution of the machinery and equipment. In this article the declared values have been estimated in a new way for a single machine and for a batch of machines. The confidence intervals of a normal distribution used in evaluation have been obtained by calculating combined standard deviation values from standard deviation values of single frequency bands (given in standards) and 1) the level information of the measured frequency bands or 2) measured A- and C-weighted level information. It is shown that it is possible to find an upper limit for the confidence interval. The declared values found in this study are equal to the values based on the common ISO method.
Original languageEnglish
Pages (from-to)1-15
JournalApplied Acoustics
Issue number1
Publication statusPublished - 1999
MoE publication typeA1 Journal article-refereed


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