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<p>Steel wire braiding reinforced polytetrafluoroethylene (PTFE) soft tubes are critical in aircraft piping systems, where their vibration and dynamic responses are essential for ensuring system reliability and safety. To investigate their dynamic performance, a high-precision finite element model was established combining material parameters from stress relaxation experiments. Modal and random vibration analyses were performed to determine the natural frequencies, stress, and velocity responses of the reinforced soft tubes. Thermal-mechanical coupling was also incorporated to simulate real operational conditions by considering ambient temperature effects. The results indicate that structural response is dominated by fundamental frequency resonance. As temperature increases, the natural frequency rises while the peak velocity response at the fundamental frequency decreases. The error between constrained mode frequencies and experimental values is below 5.44 %, validating the accuracy of model. These findings provide valuable insights for the design and analysis of reinforced soft tubes under dynamic loads.</p>

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Dynamic response of reinforced soft tubes: A numerical and experimental investigation

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Chen Fu,
  • Lingxiao Quan,
  • Yuheng Geng,
  • Jing Gao,
  • Changhong Guo

摘要

Steel wire braiding reinforced polytetrafluoroethylene (PTFE) soft tubes are critical in aircraft piping systems, where their vibration and dynamic responses are essential for ensuring system reliability and safety. To investigate their dynamic performance, a high-precision finite element model was established combining material parameters from stress relaxation experiments. Modal and random vibration analyses were performed to determine the natural frequencies, stress, and velocity responses of the reinforced soft tubes. Thermal-mechanical coupling was also incorporated to simulate real operational conditions by considering ambient temperature effects. The results indicate that structural response is dominated by fundamental frequency resonance. As temperature increases, the natural frequency rises while the peak velocity response at the fundamental frequency decreases. The error between constrained mode frequencies and experimental values is below 5.44 %, validating the accuracy of model. These findings provide valuable insights for the design and analysis of reinforced soft tubes under dynamic loads.