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A new simulation and optimization tool for calculating the attenuation of airborne and structure-borne sound of maritime silencers

Ein neues Simulations- und Optimierungswerkzeug zur Auslegung der Körperschall- und Luftschallminderung von maritimen Schalldämpfern
: Georgi, Tom; Troge, Jan; Lindner, Paul; Schulze, Christian; Hübelt, Jörn

International Institute of Noise Control Engineering -INCE-:
Inter-Noise 2018, 47th International Congress and Exposition on Noise Control Engineering : Impact of Noise Control Engineering, 26-29 August 2018, Chicago, Illinois
Chicago/Ill., 2018
ISBN: 978-1-7325986-0-7
Paper in18 1716, 11 S.
International Congress and Exposition on Noise Control Engineering (Inter-Noise) <47, 2018, Chicago/Ill.>
Fraunhofer IWU ()
SEA; Statistische Energieanalyse; Schalldämpfer; Durchgangsdämpfung; Körperschall

The acoustical impact of silencers is restricted by the influence of structure-borne sound. Thereby, excitation and radiation of structure-borne sound play an important role, as well as its transmission along the silencer system. In the design process of a silencer the influence of structure-borne sound on the damping effect is mostly considered by empirical estimations, which can cause an oversized construction. For calculating structure-borne sound in maritime silencers with their typical large dimensions, the application of statistical methods is a possible problem-solving approach. In this contribution, a new simulation and optimization tool is presented, considering the decreased damping effect of silencers due to structure-borne sound. The tool is based on Statistical Energy Analysis (SEA). Results of analytical and experimental SEA are compared. These results were obtained on downscaled silencers and have been transferred to real maritime silencers. Especially the SEA-parameters loss factor and coupling loss factor, airborne and structure-borne sound energies and the number of relevant modes are considered. Based on the measured damping of a silencer compared with numerical and statistical calculations, the capability for optimizing the design process of large silencers is shown.