標題: A study on Gabor frame for estimating instantaneous dynamic characteristics of structures
作者: Su, Wei-Chih
Huang, Chiung-Shiann
土木工程學系
Department of Civil Engineering
關鍵字: time varying;Gabor transform;instantaneous dynamic characteristics
公開日期: 1-Feb-2017
摘要: A structure under damage normally exhibits nonlinear dynamic behaviors and time-dependent stiffness and damping. By estimating instantaneous dynamic characteristics of a structures is generally very useful when assessing structural damage in real application. This study presents a novel and effective approach that accurately estimating instantaneous dynamic characteristic of a structure using time-varying autoregressive exogenous (TVARX) model on Gabor frame. To evaluate the time-varying coefficient matrices of a time-series model, the proposed procedure applies Gaussian-based weighted function and Fourier transform on time series model, then the Gabor-transform-based time series formula could be obtained. The dynamic characteristics of a structure are determined from the coefficient matrices. Numerical analyses demonstrate that the proposed approach is superior to traditional time-frequency analysis in accurately estimating instantaneous dynamic characteristics of a structure. Finally, the proposed approach is applied to process measured data for a steel frame specimen subjected to a series of base excitations in shaking table tests.
URI: http://dx.doi.org/10.21595/jve.2016.17894
http://hdl.handle.net/11536/144364
ISSN: 1392-8716
DOI: 10.21595/jve.2016.17894
期刊: JOURNAL OF VIBROENGINEERING
Volume: 19
起始頁: 447
結束頁: 457
Appears in Collections:Articles