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- W2364752740 abstract "Based on the generalized principle of resonance,resonance demodulation method is used to transform the analysis on low frequency periodic impact of rail welded joints on the vehicle-track system into the analysis of high-frequency resonance.The envelope of the measured vertical acceleration of the axle-box preprocessed by band-pass filter is extracted by use of Hilbert transform,and discrete time Fourier transform is applied to calculate its refined envelope spectrum.The percentage ratio of the energy corresponding to the first dominant frequency of the envelope spectrum to its partial energy sum within 0~5 Hz is presented to describe the periodic impact characteristics of the rail welded joints on the vehicle-track system.The curve of the percentage ratio in terms of filtering frequency is calculated,and that which corresponds to the peak of the curve is chosen as the cutoff frequency of the band-pass filter.Then the frequency range 20~450 Hz of the band-pass filter for the vertical acceleration of the axle-box is obtained.By combining the position information of the rail welded joints with large RMS value of vertical acceleration and the property that their periodic spacing is approximately 100 m,a detailed algorithm is introduced to precisely determine the position of the rail welded joints with small RMS value of vertical acceleration.According to the probability distribution RMS value of the vertical acceleration of the rail welded joints of high speed railway within 300 km·h-1,the value 50 m·s-2 is chosen as the threshold for evaluating the status of rail welded joints.On this basis,the dynamic evaluation and implementation method for rail welded joints of high speed railway within 300 km·h-1 is given." @default.
- W2364752740 created "2016-06-24" @default.
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- W2364752740 date "2011-01-01" @default.
- W2364752740 modified "2023-09-28" @default.
- W2364752740 title "Evaluation Method for High-Speed Railway Welded Joints Based on Resonance Demodulation Technology" @default.
- W2364752740 hasPublicationYear "2011" @default.
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