Experimental modelling of trimmed aircraft structures in the acoustic frequency ranges is not straightforward due to the high modal density and the relatively high damping of many of the system modes. Hence traditional modal models often fail to yield meaningful results. An alternative modelling approach is based on principal field analysis. In the case of principal field analysis, a singular value decomposition of the multi-reference FRF matric can be performed at each frequency. Plotting the singular value as function of frequency gives a more global idea of the dominant frequencies and the number of dominant modes at each frequency. When mode shapes are more important than exact individual resonance frequencies, multi-frequency analysis techniques can be used which analyse frequency bands in a global sense. These techniques have been applied to the analysis of a twin-propeller aircraft in the context of the Brite/Euram project 'ASANCA'.
Experimental modal and principal field analysis of aircraft interior acoustics
Experimentelle, modale und Hauptfeldanalyse des akustischen Verhaltens eines Flugzeuginnenraums
1994
7 Seiten, 11 Bilder, 6 Quellen
Aufsatz (Konferenz)
Englisch
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