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    題名: Aeroelastic analysis of rocket structural vibrations
    作者: Chang, Yun-Shuo;Wang, Yi-Ren
    關鍵詞: nonlinear vibrations;internal resonance;perturbation technique;unsteady aerodynamics
    日期: 2019-10-12
    上傳時間: 2020-03-31 12:10:31 (UTC+8)
    摘要: Studies of structural vibrations have always been a concern for researchers and engineers
    because it may cause the structure fatigue or failure. This study considered a free-free beam
    with cubic nonlinearities, which subjected to the distributed load with the wind pressure and its
    associated unsteady aerodynamic force. There is a wide range of applications of this study such as
    rocket structure, satellite, etc.Thepurpose of thisresearch is to find whether there is an internal
    resonance (I.R.) in the system. We analyzed this nonlinear system by the method of multiple scales
    (a perturbationtechnique);the equations of motion in different time scales were transferred into
    linear equations. Wethen utilized thefixed point plots (steady state frequency response) to
    examinethe internal resonance of the system. From the results of the fixed point plots, we found that
    there exists energy transferbetween y and zdegree of freedom (DOF) of the beam in
    specific conditions, as shown in Fig. 1. This phenomenon might cause the system occur primary
    resonance (P.R.), which was the special case of the internal resonance. Fig. 1 shows that when the
    dimensionless wind pressure q~ equals 8(Mach number = 2), the primary resonanceoccurs. When the
    y-DOF is excited, the z-DOF has larger response amplitude than the y-DOF. Finally, we used the
    numerical method, fourth-order Runge-Kutta method, to verify the results of frequency response and the internal resonance.
    關聯: The 4th International Conference in Aerospace for Young Scientists (2019)
    顯示於類別:[航空太空工程學系暨研究所] 會議論文

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