Abstract
The eigenfrequencies and vibrational modes of a simply supported stiffened rectangular plate are determined by means of perturbation method. Additional eigenmodes are excited by the presence of ribs and the eigenfrequencies are shifted. A qualitative evaluation of the influence of these additionally excited modes on the sound radiated shows that under certain conditions the ribs can improve the sound radiation of a resonant plate.References
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[3] G. MAIDANIK, Response of ribbed panels to reverberant acoustic fields, JASA, 34, 6, 809-826 (1962).
[4] V. N. ROMANOV, Izlucenie zvuka beskonecnoj plastinoj pri nalicii na nej reber zestkosti, Ak. Zur., XVII, 1, 116-121 (1971).
