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http://dx.doi.org/10.3795/KSME-A.2003.27.5.734

A Continuous Scanning Laser Doppler Vibrometer for Mode Shape Analysis  

Park, Kyi-Hwan (광주과학기술원 기전공학과)
Choi, Ji-Eun (광주과학기술원 기전공학과)
La, Jong-Pil (광주과학기술원 기전공학과)
Wang, Sem-Yung (광주과학기술원 기전공학과)
Kyoung, Yong-Soo (광주과학기술원 기전공학과)
Kim, Koung-Suk (조선대학교 기계설계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.27, no.5, 2003 , pp. 734-741 More about this Journal
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
Keywords
Continuous Scanning Laser Doppler Vibrometer; Mode Shape Analysis; Bow Scanning Compensation; Chebyshev Series;
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  • Reference
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