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Volume 59 Issue 6
Dec.  2024
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Journal of Southwest Jiaotong University  > 2024  >  59(6): 1346-1356.
XU Chang’an, NI Shaoquan, CHEN Dingjun. Collaborative Optimization for Timetable and Maintenance Window Based on Two-Stage Algorithm[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 882-888. doi: 10.3969/j.issn.0258-2724.20180577
Citation: ZHANG Wei, DONG Dawei, HUANG Yan, YAN Bing, HUA Chunrong, LYU Lumei, SONG Shizhe. Method of Splicing Constant Speed Signals with Short Signals During Wheelset Acceleration and Deceleration[J]. Journal of Southwest Jiaotong University, 2024, 59(6): 1346-1356. doi: 10.3969/j.issn.0258-2724.20220523
shu

Method of Splicing Constant Speed Signals with Short Signals During Wheelset Acceleration and Deceleration

doi: 10.3969/j.issn.0258-2724.20220523

  • School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China

  • Received Date: 02 Aug 2022
  • Rev Recd Date: 17 Mar 2023
    • Available Online: 05 Dec 2023
  • Publish Date: 18 Mar 2023
    Abstract

  • The characteristic value of train wheelsets is closely related to the speed, and the quantitative analysis of wheelset faults requires signals with a certain length collected at a certain speed. However, such a signal is difficult to be obtained by the system working in the variable speed condition. Therefore, a signal reconstruction method that did not require any velocimeters was proposed to realize the above quantitative analysis. This method used short signal segments to splice the constant speed signals under the acceleration and deceleration conditions. Firstly, a short-time Fourier transform (STFT) peak search method was adopted to obtain the speed curve and extract multiple signal segments passing through a specified speed. Secondly, the signal segments were converted into an angular domain signal, and the phase difference between signals was determined by cross-power spectra density (CPSD). Then, according to the phase difference and the length of the front signal, the splicing position of signals was obtained, and interpolation and fusion techniques were used to ensure the continuity of spliced signals. Finally, the spliced angular domain signal was resampled into the time domain signal. A rotor test bench with a similar wheelset structure has verified that during acceleration and deceleration of a cracked shaft, the frequency spectrums of the spliced signals of each speed obtained by this method are highly close to the frequency spectrums of the constant speed signals obtained by the experiment. The relative errors of the 1x and 3x values between the spliced signal of 15.0 Hz and the constant speed signal are only 0.9% and 1.0%, respectively. After adding noise to the signals to be spliced and shortening them to 1.5 cycles, the splicing phase error does not exceed 10°.

     

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    • References(17)
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