计 及 轴 向 力 作 用 的 柔 性 梁 热 — 形 耦 合 振 动 研 究

Lei Wu, Fei Han, Zichen Deng

科研成果: 期刊稿件文章同行评审

摘要

The beam-wire structure in aircraft can cause thermal deformation and vibration of flexible members dur⁃ ing service due to alternating heat flux caused by solar thermal radiation. The deformation of the rod will further af⁃ fect the magnitude and distribution of heat flux,making it a typical force shape coupling system. The stiffness,mass,or load matrix of a coupled system usually has time-varying characteristics,and the modal and response of the system can only be obtained by solving the characteristic equations multiple times and gradually integrating them. How to ensure the computational accuracy and efficiency of the solving process is a major challenge. Based on the dynamic stiffness method and the Wittrick Williams algorithm,the accurate solution of the system's natural frequency and mode has been achieved. Combining with the precise integration method,the structural response is calculated. The results show that the deviation between the first fouth natural frequencies and the finite element so⁃ lution is within 1%,and the maximum relative deviation of the response is 1%. When the variable thermal axial force approaches the critical load for structural instability,the vibration frequency of the structure rapidly decreases and tends towards 0,and the thermally induced vibration will exhibit divergence.

投稿的翻译标题Research on thermal-deformation coupling vibration of flexible beams considering axial force
源语言繁体中文
页(从-至)216-223 and 254
期刊Advances in Aeronautical Science and Engineering
15
6
DOI
出版状态已出版 - 12月 2024

关键词

  • beam-wire structure
  • dynamic stiffness method
  • thermally induced vibration
  • time-varying thermal axial force
  • Wittrick-Williams algorithm

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