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<p>Based on the actual dynamic signal time history measured during revenue service of a railway, in response to the challenge of inefficient application of dynamic stress and load data derived from actual operating conditions in railway freight car body fatigue tests, this paper proposes a method for data condensation, load decomposition, and optimization based on the principle of damage equivalence. A spectrum for accelerated fatigue testing of the car body is developed, providing experimental loading inputs for assessing fatigue reliability throughout the car body's entire lifecycle. Taking the C<sub>80</sub> type coal-carrying gondola car as the research object, and based on the principle of damage consistency, the time course of the measured stress and load was condensed, and the concentrated load is decomposed into five types of component spectra. By integrating the PSO optimization algorithm, all the component spectra were modified. The results indicate that, under the corrected load component spectra, the error between the measured stress fatigue damage at the test points and the actual damage observed on the line ranges from 0.0002 to 13.616%, effectively reproducing the fatigue damage. Finally, the corrected load component spectrum is utilized to derive the test loading spectrum for the vehicle body's accelerated fatigue test.</p>

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Research on the Accelerated Fatigue Test Spectrum of the Freight Wagon Car Body Based on Damage Consistency

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Qiang Zhang,
  • Xiaofeng Li,
  • Yundong Ma,
  • Shuai Wang,
  • Wenquan Li,
  • Chunlei Zhao

摘要

Based on the actual dynamic signal time history measured during revenue service of a railway, in response to the challenge of inefficient application of dynamic stress and load data derived from actual operating conditions in railway freight car body fatigue tests, this paper proposes a method for data condensation, load decomposition, and optimization based on the principle of damage equivalence. A spectrum for accelerated fatigue testing of the car body is developed, providing experimental loading inputs for assessing fatigue reliability throughout the car body's entire lifecycle. Taking the C80 type coal-carrying gondola car as the research object, and based on the principle of damage consistency, the time course of the measured stress and load was condensed, and the concentrated load is decomposed into five types of component spectra. By integrating the PSO optimization algorithm, all the component spectra were modified. The results indicate that, under the corrected load component spectra, the error between the measured stress fatigue damage at the test points and the actual damage observed on the line ranges from 0.0002 to 13.616%, effectively reproducing the fatigue damage. Finally, the corrected load component spectrum is utilized to derive the test loading spectrum for the vehicle body's accelerated fatigue test.