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.
|Publication status||Published - 1999|
|MoE publication type||A1 Journal article-refereed|