Concepts involved in the harmonic-response-function method, such as the direct or conjugate characteristic modes, are illustrated by application of the method to the calculation of the change in flutter characteristics of a wing due to adding concentrated masses. The main purpose of the numerical procedures which are given is to illustrate the scope of the method and to make some of its abstract formulations more specific, rather than to stress the immediate and current practical usefulness. The rigid body is first idealized as a point mass, then as a distributed mass. An appendix is given which contains some of the essential theoretical background.
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