A method for the parametric study of the eigen frequencies and eigen vectors of a dynamic system is presented. The technique is based on the force response of the original dynamic system and gives a global picture for the behavior of the system with respect to the mass and stiffness parameters. It provides the sensitivity and feasibility of shifting the eigen frequency to a designed value; thus, it can be applied to the modal modification of a dynamic system. Because no iteration is required, the method is efficient.

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