The diffraction of harmonic waves by a movable rigid strip bonded to the surface of an elastic half space is divided into two more fundamental problems, the diffraction of waves by a fixed strip and the forced motion of an inertialess strip. These problems are formulated in terms of a pair of coupled Fredholm integral equations of the first kind. An approximate solution for the resultant loads acting on the strip is obtained using the Bubnov-Galerkin method. These loads provide a simple means of studying the excited motion of a movable strip having a variety of inertia properties.

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