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High-accuracy identification for instantaneous frequency of non-stationary response signals from time-varying structures based on LOMS-STFRFT
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Jingliang LIU1, Yichen DAI1, Wenting ZHENG2, Feiyu LIAO1
Journal of Vibration Engineering | 2025, 38(4) : 750 - 760
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Journal of Vibration Engineering | 2025, 38(4): 750-760
High-accuracy identification for instantaneous frequency of non-stationary response signals from time-varying structures based on LOMS-STFRFT
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Jingliang LIU1, Yichen DAI1, Wenting ZHENG2, Feiyu LIAO1
Affiliations
  • 1.School of Transportation and Civil Engineering，Fujian Agriculture and Forestry University，Fuzhou 350108，China
  • 2.College of Civil Engineering，Fujian University of Technology，Fuzhou 350118，China
Published: 2025-04-10 doi: 10.16385/j.cnki.issn.1004-4523.2025.04.010
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To enhance the accuracy of instantaneous frequency（IF）identification for non-stationary response signals of time-varying structures，a locally optimized multi-synchrosqueezing-short time fractional Fourier transform（LOMS-STFRFT）algorithm is proposed in this paper. Firstly，the local rotation parameters of the short time fractional Fourier transform（STFRFT）are optimally selected in this method. Subsequently，the time-frequency coefficient matrix projected to the fractional domain is obtained through STFRFT. After that，IF estimation and multiple iterations are performed on the time-frequency coefficient matrix. The time-frequency coefficient matrix is reassigned by the multi-synchrosqueezing operator，and IF curves are then extracted via the local mode maxima method. The accuracy of the proposed method is validated through a numerical example of a multi-component signal and a linearly time-varying cable test. The results demonstrate that the proposed LOMS-STFRFT algorithm behaves better than traditional multi-synchrosqueezing transform on IF identification of non-stationary signals from time-varying structures.

time-varying structure  /  local optimization  /  short time fractional Fourier transform  /  multi-synchrosqueezing transform  /  instantaneous frequency
Jingliang LIU, Yichen DAI, Wenting ZHENG, Feiyu LIAO. High-accuracy identification for instantaneous frequency of non-stationary response signals from time-varying structures based on LOMS-STFRFT[J]. Journal of Vibration Engineering, 2025 , 38 (4) : 750 -760 . DOI: 10.16385/j.cnki.issn.1004-4523.2025.04.010
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doi: 10.16385/j.cnki.issn.1004-4523.2025.04.010
  • Receive Date：2024-03-23
  • Online Date：2026-02-12
  • Published：2025-04-10
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  • Received：2024-03-23
  • Revised：2024-04-22
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Affiliations
    1.School of Transportation and Civil Engineering，Fujian Agriculture and Forestry University，Fuzhou 350108，China
    2.College of Civil Engineering，Fujian University of Technology，Fuzhou 350118，China
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