A normal-mode representation of waveguide behavior is recapitulated in terms of inner and outer responses in order to enhance the analogy with quasi-static beam solutions. This setting is employed to assist in the extension of the classical Saint-Venant’s principle to dynamic problems. The surface load parameters which determine the inner solution in a waveguide with free surfaces, are identified as the frequency and the average power of the load, provided the frequency is low enough and for purely symmetric (or purely antisymmetric) loads. A quantitative estimate of the extension of end effects is given. The one to one correspondence between the equivalent loads and the inner solution is used to reformulate the dynamic analogue of Saint-Venant’s principle.

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