Abstract
In this study, the optimization problem of dynamical characteristic of vibration controllers for mechanical structures subjected to such a nonstationary input as seismic wave is dealt with. A simple optimization technique based upon the stationary design and the modal analysis is presented. In order to take into account the nonstationary influence in the response, the stationary criterion is modified in each mode by the ratio of the response variance of each mode to the square of the response spectrum: By applying this technique to the optimization problem of the allocation and the dynamical characteristics of a dynamical vibration absorber for a piping system, its usefulness is verified.
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