The present invention relates to an apparatus and a method for designing a phase topology in a direct frequency response analysis, and more particularly, to a system and method for optimizing a phase topology in a direct frequency response analysis. More particularly, To an apparatus and method for providing effective phase design results for a structure by determining the frequency relationship. According to the present invention, the relationship between the excitation frequency and the natural frequency of the analytical model can be determined using the compliance ratio without obtaining the natural frequency. Even when the excitation frequency is larger than the natural frequency, the optimum effective phase design result .
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