@article {Voelkel:2016:0736-2935:5234,
title = "Influence of Directivity and Spectral Shape on the Measured Sound Power Level",
journal = "INTER-NOISE and NOISE-CON Congress and Conference Proceedings",
parent_itemid = "infobike://ince/incecp",
publishercode ="ince",
year = "2016",
volume = "253",
number = "3",
publication date ="2016-08-21T00:00:00",
pages = "5234-5241",
itemtype = "ARTICLE",
issn = "0736-2935",
url = "https://ince.publisher.ingentaconnect.com/content/ince/incecp/2016/00000253/00000003/art00046",
author = "Voelkel, Katharina",
abstract = "The sound power is the main quantity to describe the total amount of sound emitted by a source. According to the substitution method, the sound power of an unknown sound source can be determined by replacing it with a reference sound source of known power. At present, this method is
lacking a quantitative relation between the characteristics of the sound sources used and the uncertainty budget of the determined sound power level. To change this, models describing the spectral shape and directivity of sound emission of unknown sources were established. The models describe
sound pressure levels on enveloping surfaces for the source under test. These could be compared to measurement data for a reference sound source. Using the substitution method, sound power levels for the model data could be calculated. Models were generated using both a pseudo-random number
generator as well as finite element software. Sound sources were assumed to be operated in closed rooms. The wall properties were varied to provide smaller or larger amounts of reflections. Using Monte-Carlo simulations the uncertainty that is due to the spectral shape and directivity of the
sound emission of sources under test was investigated.",
}