Stall Flutter Analysis of High-Aspect-Ratio Composite Wing
大展弦比复合材料机翼失速颤振分析(英文)作者机构：School of Aeronautics Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China
出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)
年 卷 期：2006年第19卷第1期
页 面：36-43页
核心收录：
学科分类：08[工学] 0825[工学-航空宇航科学与技术]
主 题：stall flutter high-aspect-ratio wing geometric nonlinearity composites thln-walled closed section beam
摘 要：The stall flutter characters of high-aspect-ratio composite wing are investigated, and the effects of structure geometric nonlinearity and stiffness couple created by composite anisotropy on them also are discussed. Firstly, the high-aspect-ratio wing is modeled as a composite thin-walled closed section Euler beam whose displacement and rotation both could be of finite value, and the nonlinear dynamic equations is build up on it with all the effects of geometric nonlinearity, aerodynamic nonlinearity and anisotropy of material being considered. Then vibration equations are deduced through perturbing the dynamic equations at wing＇s equilibrium position, and coupled with unsteady stall aerodynamic model and ONERA model, to obtain the nonlinear stall flutter analysis equations of wing. Finally, the flutter stabilities with various wind speeds are determined by the harmonic balance method. With several exampies, the validity of the stall flutter model is proved, and the significant effects of geometric nonlinearity on the stall flutter various characters as wall as the effects of ply angle on the stall flutter speed and frequency also are discussed.
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