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Simulation of the sound radiation of an air conditioning unit from a railway vehicle using transfermatrix techniques

Simulation der Schallabstrahlung eines Bahnklimagerätes mithilfe von Transfermatrix Methoden
: Linke, Moritz

Associazione Italiana di Acustica -AIA-; Deutsche Gesellschaft für Akustik -DEGA-, Berlin; European Acoustics Association -EAA-:
AIA-DAGA 2013. International Conference on Acoustics. Proceedings. CD-ROM : EAA Euroregio, EAA Winterschool; 18 - 21 March 2013 in Merano
Berlin: DEGA, 2013
ISBN: 978-3-939296-05-8
Deutsche Jahrestagung für Akustik (DAGA) <39, 2013, Meran>
Italienische Jahrestagung für Akustik (AIA) <40, 2013, Meran>
International Conference on Acoustics <2013, Meran>
Fraunhofer IWU ()
acoustics; simulation; air borne sound; air borne sound simulation; air propagation simulation; air conditioning; AC; duct; fan; condensor; transfer element; two port; four pole; m-port; transfer matrix; acoutic model; source; path; receiver; railway; Railway vehicle; 3D wave guide; wave guide; modal representation; Akustik; Simulation; Berechnung; Schallausbreitung; Vierpol; Zweitor; elektromechanische Analogie; Klimaanlage; Kanal; Lüfter; Transfermatrix; Bahnakustik; Waggon; Personenwagen; Wellenleiter; 3D-Wellenleiter; akustisches Modell; Quelle; Pfad; Empfänger

The air conditioning (AC) unit is one of the dominant sound sources for exterior and interior noise of a railway vehicle. The design of such devices is a compromise between major functions like efficiency, fluid mechanics, thermodynamics and acoustics. The vibrational and acoustical behavior of an air conditioning unit needs to be quantified in every state of the development process, starting in an early design phase.
Therefore preferably simple and fast calculation tools are needed, which can be easily built up and adapted in a short period of time. Within a research project at the Fraunhofer Institute for Machine Tools and Forming Technology (IWU) an acoustical calculation model, based on transfer matrices of the different components, has been created to give a sufficiently accurate description of the sound power radiated by the air conditioning unit. In a first step the sound power of relevant sources has been characterized by measurement data. Furthermore the acoustical transfer behavior of ducts, chambers and additional components like condensers or evaporators have been individually investigated and implemented in the model using -port elements. Finally, the sources and transfer components were combined to get a complete representation of the acoustical properties of the air conditioning unit, which can be used for parameter variation studies.