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Method to obtain exact frequency characteristics of harmonic signals

Journal Article


Abstract


  • 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.

Publication Date


  • 1999

Citation


  • Qiu, Z. L., & Tieu, A. K. (1999). Method to obtain exact frequency characteristics of harmonic signals. Mechanical Systems and Signal Processing, 13(3), 523-529. doi:10.1006/mssp.1998.1208

Scopus Eid


  • 2-s2.0-0033131843

Start Page


  • 523

End Page


  • 529

Volume


  • 13

Issue


  • 3

Abstract


  • 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.

Publication Date


  • 1999

Citation


  • Qiu, Z. L., & Tieu, A. K. (1999). Method to obtain exact frequency characteristics of harmonic signals. Mechanical Systems and Signal Processing, 13(3), 523-529. doi:10.1006/mssp.1998.1208

Scopus Eid


  • 2-s2.0-0033131843

Start Page


  • 523

End Page


  • 529

Volume


  • 13

Issue


  • 3