Daniel A. Russell
Victor W. Sparrow
Graduate Prog. in Acoust., Penn State Univ., University Park, PA 16802
In current fuzzy structure theory, the fuzzy substructure is generally modeled as a system of independent 1-DOF oscillators attached to the master structure. Several assumptions are usually made. Firstly, while the attachments are applied to one side only of the master structure (plate or shell), the effects of asymmetric loading are ignored. In this paper, it is shown that the asymmetric loading may provide a coupling mechanism between flexural waves and membrane waves in plates and shells, thus altering the predicted added damping effect of the fuzzy substructure. Secondly, until now the motion of the attachments is usually restricted to only one translational direction. This paper considers the possibility of coupling between wave types in plates and shells when the fuzzy attachments are allowed to move in three translational directions, as well as rotational motion about their attachment points. Furthermore, the effects of these new attachment motions are analyzed using a wave impedance/dispersion relation approach. [Work supported by ONR.]