热环境下复合材料壁板的非线性颤振特性分析  

Nonlinear Flutter Analysis of Composite Panels in Thermal Environment

作　　者：屈佑文 安效民[1] 邓斌 闫浩 周悦 Qu Youwen;An Xiaomin;Deng Bin;Yan Hao;Zhou Yue(School of Astronautics,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]西北工业大学航天学院,西安710072

出　　处：《航空兵器》2022年第4期91-99,共9页Aero Weaponry

基　　金：国家自然科学基金项目(12072278);航空科学基金项目(201901053001)。

摘　　要：复合材料因其优异的性能已被广泛应用于飞行器的结构中。在高超声速飞行时,由于非定常气动载荷和热效应的共同作用,飞行器复合材料壁板会出现屈曲及非线性颤振现象。本文基于均匀温度场建立了考虑热效应的复合材料薄壁结构的非线性有限元模型,结合气动-结构二阶松耦合算法,针对复合材料壁板在Ma_(∞)=5时的非线性气动弹性响应进行分析,探讨了复合材料铺层方向、温度载荷等对壁板颤振特性的影响。结果表明,壁板响应受到温度载荷、铺层方向及来流动压等多方面的影响。斜交壁板的颤振动压高于正交壁板颤振动压(增量大于55%);随着温度载荷的增大,壁板颤振动压会下降,最大降幅约为动压的80%。当出现热屈曲时,颤振动压又会缓慢增大;当温度超过结构的临界屈曲温度时,壁板在亚临界条件下会出现多个屈曲位置,随着动压的变化而发生转变。Composite materials have been widely applied to the structure of high-speed flight vehicles due to their excellent performance.In hypersonic flight,the buckling and nonlinear flutter will occur in the composite panel on account of the combined action of unsteady aerodynamic load and thermal effect.In this paper,the nonlinear finite element model of the composite thin-walled structure considering thermal effect is established,and combined with the second-order loose coupling algorithm of dynamic-structure,the nonlinear aeroelastic response of composite panels at Ma_(∞)=5 is analyzed.The influence of the direction of composite layer and tempera-ture load on the flutter characteristics of the panel is discussed.The results show that the flutter of the panel is affected by temperature load,layer direction and free stream dynamic pressure.The flutter critical dynamic pressure of the angle-ply panel is higher than that of the cross-ply panel(the increment is more than 55%).With the increase of temperature,the flutter pressure of the panels will decrease,and the maximum reduction is about 80%.While thermal buckling occurs,the flutter dynamic pressure will increase slowly.When the temperature exceeds the critical buckling temperature of the structure,the panel will have static buckling positions under subcritical conditions,and the buckling equilibrium position changes with different dynamic pressures.

关 键 词：高超声速 壁板颤振 复合材料 热效应 非线性气动弹性 热屈曲 飞行器 

分 类 号：TJ760[兵器科学与技术—武器系统与运用工程] V214.8[航空宇航科学与技术—航空宇航推进理论与工程]