Abstract
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Accurate frequency characteristics are critical in some dynamics measurement. Power leakage in FFT can result in considerable error in the calculation of the frequency characteristics. In this paper, an optimizing approach is developed to determine the exact frequencies of experimental harmonic signals. The experimental signal is resampled in a sample duration of an integral number of the signal's period. The resampling duration is computed via an optimization algorithm. The leakage error in FFT is avoided and the accuracy in the calculation of the frequency characteristics is greatly increased. Detailed procedures and experimental examples are presented.