Interior aircraft lining elements often consist of honeycomb sandwich plates. The main advantage of such plates is their low weight in conjunction with a rather high mechanical stiffness. A major drawback, however, is their low sound insulation. In the current paper a computational procedure is presented, which is based on a coupling of finite elements and boundary elements, and applied to predict the sound transmission loss of honeycomb sandwich plates. While finite elements are used to model the plates, boundary elements are employed to represent the acoustic fluid (the air). The methodology includes a baffled boundary element formulation and the option to generate a diffuse acoustic excitation by a superposition of plane waves. Special attention is paid to the modeling of the aircraft lining elements. In particular, a combination of shell elements for the skin with volume elements for the honeycomb core is proposed. First, the structural model is validated by means of an experimental modal analysis, and then the sound transmission of a honeycomb plate is investigated. The comparison of measured and calculated results shows excellent agreement.
Numerical modelling of sound transmission loss of interior aircraft lining elements
2003
8 Seiten, 8 Quellen
Conference paper
English
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