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Instantaneous frequency extraction in time-varying structures using a maximum gradient method

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Liu, Jingliang, Wei, Xiaojun, Qiu, Renhui, Zheng, Jinyang, Zhu, Yanjie and Laory, Irwanda (2018) Instantaneous frequency extraction in time-varying structures using a maximum gradient method. Smart Structures and Systems, 22 (3). pp. 359-368. doi:10.12989/sss.2018.22.3.359 ISSN 1738-1584.

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Official URL: https://doi.org/10.12989/sss.2018.22.3.359

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Abstract

A method is proposed for the identification of instantaneous frequencies (IFs) in time-varying structures. The proposed method combines a maximum gradient algorithm and a smoothing operation. The maximum gradient algorithm is designed to extract the wavelet ridges of response signals. The smoothing operation, based on a polynomial curve fitting algorithm and a threshold method, is employed to reduce the effects of random noises. To verify the effectiveness and accuracy of the proposed method, a numerical example of a signal with two frequency modulated components is investigated and an experimental test on a steel cable with time-varying tensions is also conducted. The results demonstrate that the proposed method can extract IFs from the noisy multi-component signals and practical response signals successfully. In addition, the proposed method can provide a better IF identification results than the standard synchrosqueezing wavelet transform.

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Journal or Publication Title: Smart Structures and Systems
Publisher: Techno-Press
ISSN: 1738-1584
Official Date: 2018
Dates:
DateEvent
2018Published
25 September 2018Available
20 June 2018Accepted
Volume: 22
Number: 3
Page Range: pp. 359-368
DOI: 10.12989/sss.2018.22.3.359
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 3 December 2018
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