Wavelet Transforms for System Identification in Civil Engineering

Computer-Aided Civil and Infrastructure Engineering - Tập 18 Số 5 - Trang 339-355 - 2003
T. Kijewski1, Ahsan Kareem1
11 University of Notre Dame, USA, 2University of Notre Dame, USA [email protected]

Tóm tắt

Abstract:  The time‐frequency character of wavelet transforms allows adaptation of both traditional time and frequency domain system identification approaches to examine nonlinear and non‐stationary data. Although challenges did not surface in prior applications concerned with mechanical systems, which are characterized by higher frequency and broader‐band signals, the transition to the time‐frequency domain for the analysis of civil engineering structures highlighted the need to understand more fully various processing concerns, particularly for the popular Morlet wavelet. In particular, as these systems may possess longer period motions and thus require finer frequency resolutions, the particular impacts of end effects become increasingly apparent. This study discusses these considerations in the context of the wavelet's multi‐resolution character and includes guidelines for selection of wavelet central frequencies, highlights their role in complete modal separation, and quantifies their contributions to end‐effect errors, which may be minimized through a simple padding scheme.

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Thông tin xuất bản

Computer-Aided Civil and Infrastructure Engineering

Tập 18 Số 5

339-355

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