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Experimental Modal Analysis by Using Hilbert Transform of Signal from Continuous Scanning Laser Vibrometer  

Kang, Min-Sig (경원대 공대 기계공학과)
Chang, Tae-Gyu (중앙대 공대 전기전자공학부)
Kim, Ho-Sung (중앙대 공대 전기전자공학부)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers D / v.51, no.6, 2002 , pp. 272-277 More about this Journal
Abstract
This paper deals with the vibration deflection shape measurement technique for a sinusoidally excited structure using a continuously scanning laser Doppler vibrometer (CSLV). The CSLV output signal is an amplitude-modulated vibration in which the excitation signal is modulated by the deflection shapes, and thus the deflection shapes of vibration defined along a scan line can be derived by the envelop and the phase information of the CSLV output signal. In this work, a Hilbert transform based approach has been proposed for measurement of deflection shapes. This technique is as simple as the demodulation technique and allows more convenient experimental settings than the Fourier transform approach. The feasibility of the proposed technique is illustrated along with results of experiment.
Keywords
CLSV; vibration mode; Hibert transform; Fourier transform;
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  • Reference
1 P. Sriram, Mode shape measurement using a scanning laser Doppler vibrometer,' The international J. of analytical and experimental modal analysis, vol. 7, pp. 169-178, 1992
2 A.B. Stanbridge, M. Martarelli, and D. J. Ewins, 'Measuring area mode shapes with a scanning laser Doppler vibrometer,' Proc. of IMAC XVII, pp. 980-984, 1999
3 A.B. Stanbridge and D. J. Ewins, 'Measurement of translational and angular vibration using a scanning laser Doppler vibrometer,' Shock and vibration, vol. 3, pp. 141-152, 1996   DOI
4 A.B. Stanbridge and D. J. Ewins, 'Modal testing using a scanning laser Doppler vibrometer,' Mechanical systems and signal processing, vol. 13, pp. 255-270, 1999   DOI   ScienceOn
5 A.B. Stanbridge, M. Martarelli, and D. J. Ewins, 'The scanning laser Doppler vibrometer applied to impact modal testing,' Proc. of IMAC XVII, pp. 986-991, 1999
6 J. C. Goswami and A. K. Chan, Fundamentals of wavelets, Wiley Interscience, 1999
7 J.S. Bendat and A.G. Piersol, Random Data Analysis and measurement procedures-second edition, pp. 484-516. New York: John Wieley & Sons, 1986
8 M. Feldman, 'Non-linear free vibration identification via the Hilbert transform,' Journal of Sound and Vibration, vol. 208, pp. 475-489, 1997   DOI   ScienceOn
9 E. Bedrosian, 'A product theorem for Hilbert transform,' Proceedings of IEEE, vol. 51, pp. 868-869, 1963
10 A. Agneni, 'On the use of the Gauss filter in modal parameter estimation,' Mechanical Systems and Signal Processing, vol. 14, pp. 193-204, 2000   DOI   ScienceOn