超音速气流中热塑性复合材料壁板的非线性热颤振特性  

Nonlinear thermal flutter characteristics of thermoplastic composite panels in supersonic flow

作　　者：高艺航 段静波 雷勇军[1] GAO Yihang;DUAN Jingbo;LEI Yongjun(College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China;Beijing Institute of Astronautical Systems Engineering, China Academy of Launch Vehicle Technology, Beijing 100076, China;Department of Engineering Mechanics, Shijiazhuang Tiedao University, Shijiazhuang 050043, China)

机构地区：[1]国防科技大学空天科学学院,湖南长沙410073 [2]中国运载火箭技术研究院北京宇航系统工程研究所,北京100076 [3]石家庄铁道大学工程力学系,河北石家庄050043

出　　处：《国防科技大学学报》2022年第2期16-23,共8页Journal of National University of Defense Technology

基　　金：国家自然科学基金资助项目(11702325);河北省重点研发计划资助项目(213504010);民航航空器适航审定技术重点实验室开放基金资助项目(SH2020112705)。

摘　　要：热塑性复合材料结构在高速流场中的颤振行为是可重复使用航天器设计中需要考虑的问题。基于Mindlin厚板理论和Von-Karman大变形理论描述热塑性复合壁板结构大变形,超音速气动力采用活塞气动理论。考虑温度引起的壁板面内热应力和热塑性材料力学性能的改变。根据虚功原理和有限元法推导建立了热塑性复合材料壁板的热颤振模型,进而采用V-g法和Newmark法分别从频域和时域求解热塑性壁板的热颤振特性。在验证方法正确性和收敛性的基础上,讨论了温度对热塑性复合壁板的颤振频域模态耦合特性、颤振时域极限环振荡特性。结果表明,考虑热塑性材料温变特性会进一步降低壁板的颤振动压,而且热塑性壁板极限环振荡下等效应力水平较低,没有达到材料屈服极限。The flutter behavior of thermoplastic composite structures in high-speed flow is a key problem in the design of reusable spacecraft.Based on the classical Mindlin thick theory,the Von-Karman larger deformation theory and the piston theory,the thermoplastic composite structure panel and its aerodynamics were described,along with the consideration of both the thermal stress and the variation of mechanical properties caused by the temperature.The aeroelastic model of the thermoplastic composite panel was established based on the principle of virtual work and the finite element method,and the V-g method and the Newmark method were used to solve the thermal flutter characteristics of the thermoplastic panel from frequency domain and time domain,respectively.After the validity and convergence of the presented method were verified,the effects of temperature on mode coupling in frequency domain,limit cycle oscillation in time-domain and stress response were investigated.The results show that the flutter dynamic pressure obtained by considering the temperature variation of thermoplastic materials will further reduce the flutter dynamic pressure of the panel,and the equivalent stress of thermoplastic panels under the limit cycle oscillation is lower than the material yield limit.

关 键 词：热塑性复合壁板 非线性热颤振 超音速气流 模态耦合 极限环振荡特性 

分 类 号：O322[理学—一般力学与力学基础]