Abstract
Closely coupled modes of two connected structures may be considered to be “global modes,” involving the combined motion of both structures. Such modes will account for the greatest energy transfer between the structures, and it is therefore desirable to find ways of detecting them. This paper is interested in the case in which it is convenient to make measurements on only one of the two structures, in this case a “foundation model” that is connected to a “hull model.” The foundation (a beam) is excited by a shaker, and its drive point mobility is measured. At certain frequencies, an interaction with the hull (plate) modes can be detected. This interaction can be modified by using small masses to change the coupling between the structures and the foundation resonances. In this way, the global modes can be separated truly from structural resonances that simply happen to lie close to each other.
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