PROPAGATION OF FLEXURAL WAVES IN INFINITE, DAMPED RIB-SKIN STRUCTURES.
Technical rept. 1 Jun-31 Dec 68,
SOUTHAMPTON UNIV (ENGLAND) INST OF SOUND AND VIBRATION RESEARCH
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Equations for the propagation constants of free flexural waves in rib-skin type structures are first developed in terms of the edge receptance of the ribs and skin elements. It is shown that two complex propagation constants exist for each frequency, and corresponding to each of these is a distinct natural wave of flexural motion in the skins. A particular rib-skin structure with thin ribs is then studied in detail, and the variation of the propagation constants with frequency is observed. Free, unattenuated propagation of the waves is only possible in certain frequency ranges which, for each of the two natural waves, may overlap. The influence of the ribs on these ranges is investigated. Author