In this paper, a low noise flow duct facility that performs a multimodal characterization of the passive and active acoustic properties of obstacles in the aero-acoustic conditions of an automotive air conditioning system is presented. The experimental procedure is made of two steps. In the first step the passive data, i.e. the multimodal scattering matrix, is measured with a multi-sources method. In the second step the outgoing modal pressure spectra radiated upstream and downstream by the flow obstacle interaction source is achieved. A numerical simulation of the experiment based on a 3D-Finite Element Method is developed. A very good agreement between the theoretical and experimental results of the no flow scattering matrix of an evaporator is found. The effect of the flow on the scattering matrix is shown before performing the measurement of the aero-acoustic source characteristics of an evaporator.
Experimental characterization and numerical simulation of the passive and active acoustical properties of an automotive air conditioning element using the scattering matrix approach
2010
10 Seiten, 16 Bilder, 9 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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