Abstract
Acousto-elastic interaction effects in the response of large windows to sonic bangs have been studied in some detail both theoretically and experimentally. If such a window is backed by a closed cavity the modification to the natural frequency of the fundamental mode, an important parameter, can be estimated with some accuracy. The point of maximum stress stays at the centre of the window, though the fundamental mode shape is considerably modified. However, the maximum stress is reduced as the acoustic stiffness of the room increases provided that resonance effects are not induced by the change in fundamental natural frequency of the system. This latter aspect can be treated separately. Movement of the point of fracture away from the window centre can probably be accounted for by departure from the basic assumption of small displacements. This is to be studied further.
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