Abstract
Fast Fourier transform (FFT) has been widely used to analyze distribution patterns of frequency components in dynamic response signals. Given a stationary dynamic response signal, a fixed frequency distribution pattern can be obtained efficiently using FFT. If the system of concern is not stationary, however, the frequency distribution pattern varies with time, and the variation in that pattern cannot be effectively determined via FFT. To overcome this weakness, time-frequency dual-domain signal analysis methods such as wavelet transform and Hilbert-Huang transform (HHT) have been introduced. HHT has been shown to be particularly effective in analysis of non-stationary signals obtained from non-linear as well as linear systems. In the present study, the transient characteristics of a composite panel undergoing high-velocity impact were investigated. The composite panel, along with the colliding bullet, were modeled using the finite element method. To verify the reliability of the analysis model, an impact experiment was carried out, which proved that the model provides reliable, similar-to-experimental results.
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This paper was recommended for publication in revised form by Editor-in-Chief Keum-Shik Hong
Seung Kyu Lee received his B.S. and M.S. degrees from the Department of Mechanical Engineering at Hanyang University in 2008 and 2010. His research interests include structural vibration, signal analysis and diagnostics in mechanical structures.
Hong Hee Yoo received his B.S. and M.S. degrees from the Department of Mechanical Design at Seoul National University in 1980 and 1982. His Ph.D. degree was awarded by the Department of Mechanical Engineering and Applied Mechanics, University of Michigan (Ann Arbor), in 1989. He is currently a professor in the Department of Mechanical Engineering at Hanyang University, Seoul, Korea. His research interests include multi-body dynamics, structural vibration, and statistical uncertainty analysis in mechanics.
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Lee, S.K., Kim, Y.W., Koo, M.H. et al. Hilbert-Huang Transform (HHT) transient analysis of composite panel undergoing high-velocity impact. J Mech Sci Technol 24, 2395–2400 (2010). https://doi.org/10.1007/s12206-010-0912-4
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DOI: https://doi.org/10.1007/s12206-010-0912-4