The Improvement of Leakage Error in Digital courier Transform

디지털 푸리에 변환에서 누설오차의 개선

  • 정의봉 (부산대학교 기계공학부) ;
  • 안세진 (부산대학교 대학원 기계설계공학과) ;
  • 장호엽 (부산대학교 대학원 기계설계공학과) ;
  • 장진혁 (부산대학교 대학원 기계설계공학과)
  • Published : 2001.06.01

Abstract

An exact spectrum wish no leakage error could be obtained when the period of the signal coincides perfectly with the record length. However, the record length will be determined regardless of the period of signal. The Leakage error due to this problem will gibe a distorted spectrum. In the conventional research, the method was proposed to estimate the three parameters, frequency, amplitude and phase angle, from the spectrum data for anundamped sinusoidal signal. In this paper, some techniques are proposed to estimate frequency, amplitude and damping ratios from the frequency response functions for damped signals. The validation of the proposed techniques is verified by several numerical examples.

Keywords

References

  1. The Journal of the Acoustical Society of America v.58 no.3 On Digital Spectrum Analysis of Periodic Signals John C. Burgess
  2. Mechanical System and Signal Processing v.9 no.2 Phase Error in Fast fourier Transform Analysis Huang Dishan
  3. 대한기계학회 1999년 추계학술대회 논문집A 디지털 푸리에 변환에서 비감쇠 신호의 누설오차 개선에 관한 연구 정의봉;장진혁;장다운
  4. 컴퓨터 수치해석 홍준표