Abstract
The impulse response function of a uniform panel immersed in a uniform environment is assumed known. The modification in this impulse response function due to the attachment of identical and regularly spaced ribs is derived. The manner of negotiating this modified impulse response function from the discreteness to the continuum of ribs is discussed. The negotiation reveals the criteria that need to be satisfied for uniformly lumping the ribs in the panel. When the criteria are substantially satisfied, the ribbed panel becomes essentially a uniform panel. The ribs are then accounted for by lumped modification of the uniform impedance of the unribbed panel.
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