Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Continuous Scanning Laser Doppler Vibrometer for Mode Shape Analysis

모드형상분석을 위한 연속 스캐닝 레이저 도플러 진동측정기

  • 박기환 (광주과학기술원 기전공학과) ;
  • 최지은 (광주과학기술원 기전공학과) ;
  • 라종필 (광주과학기술원 기전공학과) ;
  • 왕세명 (광주과학기술원 기전공학과) ;
  • 경용수 (광주과학기술원 기전공학과) ;
  • 김경석 (조선대학교 기계설계공학과)
  • Published : 2003.05.01
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Abstract

This paper addresses the vibration mode shape Measurement technique utilizing a Continuous Scanning Laser Doppler Vibrometer (CSLDV). The continuous scanning capability is added to the conventional discrete Laser Doppler Vibrometer by reflecting the laser beams on the surface of the object using two oscillating mirrors. The bow scanning resulted from the proposed scanning method is eliminated by feedback control. The velocity output signal from the CSLDV is modulated to give the spatial velocity distribution in terms of coefficients which are obtained from the Fast Fourier Transformation of the time dependent velocity signal. Using the Chebyshev series from, the analysis of the vibration mode shape techniques for straight line scanning and 2 dimensional scanning are presented and discussed. The performance of the proposed SLDV is presented using the experimental results of the vibration mode shape of a cantilever and plate

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References

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