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Improved variable scale-convex-peak method for weak signal detection

Author

Listed:
  • Li, Haiping
  • Tian, Ruilan
  • Xue, Qiang
  • Zhang, Yangkun
  • Zhang, Xiaolong

Abstract

Based on the rectification method of detectable domain and elimination method of blind domain, the variable scale-convex-peak method for the identification frequency of weak signal is improved. For the initial phase of weak signal to be detected, the analytic expression of chaotic threshold is obtained by using the stochastic Melnikov method. The influence of phase on chaotic threshold is clarified, which leads to that the frequency of weak signal can be identified. Specifically, within a period, the initial phase can be divided into the detectable domain and the blind domain. In the detectable domain, when the frequency identification deviates, the rectification method of detectable domain is introduced. Specifically, the Newton interpolation method is used to give the calculation formula to rectify the deviation, which improves the accuracy of frequency identification. In the blind domain, the elimination method of blind domain is given by constructing the detection equations. The feasibility of the improved variable scale-convex-peak method is verified by numerical simulation and circuit experiment. Furthermore, by comparing the identified frequency value with the theoretical fault frequency value, the fault location of the wheelset bearing of the high-speed train is determined. The improved variable scale-convex-peak method is applied when the initial phase is in the frequency detectable domain or the blind domain, respectively.

Suggested Citation

  • Li, Haiping & Tian, Ruilan & Xue, Qiang & Zhang, Yangkun & Zhang, Xiaolong, 2022. "Improved variable scale-convex-peak method for weak signal detection," Chaos, Solitons & Fractals, Elsevier, vol. 156(C).
    • Handle: RePEc:eee:chsofr:v:156:y:2022:i:c:s0960077922000637
    DOI: 10.1016/j.chaos.2022.111852
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    References listed on IDEAS

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    1. QiuBao Wang & Yuejuan Yang & Xing Zhang, 2020. "Detection of Weak Signal Based on Parameter Identification of Delay Differential System with Noise Disturbance," Mathematical Problems in Engineering, Hindawi, vol. 2020, pages 1-9, April.
    2. Wang, QiuBao & Yang, YueJuan & Zhang, Xing, 2020. "Weak signal detection based on Mathieu-Duffing oscillator with time-delay feedback and multiplicative noise," Chaos, Solitons & Fractals, Elsevier, vol. 137(C).
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    Cited by:

    1. Wang, Tian & Zhang, Qichang & Han, Jianxin & Wang, Wei & Yan, Yucheng & Cao, Xinyu & Hao, Shuying, 2023. "Bio-inspired quad-stable piezoelectric energy harvester for low-frequency vibration scavenging," Energy, Elsevier, vol. 282(C).
    2. Yang, GuiJiang & Ai, Hao & Liu, Wei & Wang, Qiubao, 2023. "Weak signal detection based on variable-situation-potential with time-delay feedback and colored noise," Chaos, Solitons & Fractals, Elsevier, vol. 169(C).

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