The methods of inversion and the maximum likelihood estimation in acoustic tests of industrial sources in the environment

Determining an acoustic model of a factory is a topic connected to the noise sources identification
in the factory, their localization and acoustic parameters. In order to determine the
source parameters correctly, it is necessary to use the whole available knowledge accessed in
acoustic measurements and the knowledge obtained \textit{a priori} (e.g. on the basis of producers’
catalogues of equipment). To solve this problem the method of the acoustic inversion was used
with the maximum likelihood estimation. The biggest advantage of this method is the possibility
to use the information concerning accuracy of the determined \textit{a priori} sound power of
noise sources and indicating the importance of the sound pressure level values in measurement
areas. The theoretical assumptions of the method, its adjustment to the industrial conditions
as well as tosome computer simulations are presented in the paper.