Abstract
This paper introduces a simple design method for tuned dynamic mass(D.M.) systems with very large added mass ratio which is the value of D.M.(rotating inertial mass) to mass of the main structure. The method is constructed on the bases of rule of geometric mean and rule of difference/sum for the natural periods computed under the particular conditions of viscous damping factors of hd= 0 and hd= ∞. The rules are derived from the properties of the invariant point theory. The paper shows that the structures can be designed by the proposed method, which hold viscous damping factors more than 0.2 for the 1st and 2nd modes.
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