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http://dx.doi.org/10.5050/KSNVN.2005.15.3.266

Adaptive Short-time Fourier Transform for Guided-wave Analysis  

Hong, Jin-Chul (서울대학교 기계항공부 대학원)
Sun, Kyung-Ho (서울대학교 기계공학부 대학원)
Kim, Yoon-Young (서울대학교 기계항공공학부)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.15, no.3, 2005 , pp. 266-271 More about this Journal
Abstract
Although time-frequency analysis is useful for dispersive wave analysis, conventional methods such as the short-time Fourier transform do not take the dispersion phenomenon into consideration in the tiling of the time-frequency domain. The objective of this paper is to develop an adaptive time-frequency analysis method whose time-frequency tiling is determined with the consideration of signal dispersion characteristics. To achieve the adaptive time-frequency tiling, each of time-frequency atoms is rotated in the time-frequency plane depending on the local wave dispersion. To carry out this adaptive time-frequency transform, dispersion characteristics hidden in a signal are first estimated by an iterative scheme. To examine the effectiveness of the present method, the flexural wave signals measured in a plate were analyzed.
Keywords
Guided-wave; Dispersion; Time-frequency Analysis; Adaptive Short-time Fourier Transform;
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