Modal parameter identification of structures based on short-time narrow-banded mode decomposition

Author:

Zhou Wei1,Feng Zhongren12,Liu Dongsheng3,Wang Xiongjiang1ORCID,Chen Baiben1

Affiliation:

1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, P.R. China

2. School of Urban Construction, Wuchang Shouyi University, Wuhan, P.R. China

3. CCCC Second Highway Consultants Co., Ltd., Wuhan, P.R. China

Abstract

The accurate estimation of natural frequencies and damping ratios is critical for civil structures. In this article, a method based on short-time narrow-banded mode decomposition is proposed to analyze the modal parameters of civil structures. In this approach, short-time narrow-banded mode decomposition is applied to identify time-varying structures with free vibration responses. On the contrary, by analysis of the weighting factors α and β, short-time narrow-banded mode decomposition is improved to estimate the parameter of time-invariant systems. In the case of enhanced short-time narrow-banded mode decomposition, the original short-time narrow-banded mode decomposition approach is modified in two ways. First, the instantaneous frequency term of the objective function is removed, and one weighting factor remains, that is, α in the objective function. Second, a technique is provided to automatically detect the optimum value of α. Two numerical examples, that is, a three-degree-of-freedom time-variant system and a simple model of the Lysefjord bridge are provided. In addition, an experiment with a real-life pedestrian bridge located at Tufts University, United States, is used to demonstrate the applicability of the proposed method. The analysis results indicate that the proposed method can easily identify high-quality natural frequencies and damping ratios.

Funder

Natural Science Foundation of Hubei Province

Publisher

SAGE Publications

Subject

Building and Construction,Civil and Structural Engineering

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