Ah&act-A method is described for representing a structural component by means of its vibration modes, The modes used to describe the component may have the connection points to the remainder of the structure free, or tixed, or some points free and some points fixed. The modes may either be calculated or experimentally measured. Statically determined deflection influence coethcients may be used to improve the accuracy of the representation. The advantages claimed for the method derive from the generality of the conditions under which the component modes are calculated (or measured). Thus the boundary conditions may be selected to optimize accuracy or, in the event that the modes have already been obtained, the method permits the available data to be used. Examples are presented that illustrate use of the method, and the significance of the improvements derived from static calculations.
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