曲线纤维变刚度壁板的亚音速气弹稳定性研究

针对曲线纤维变刚度复合材料层合板在高速列车壁板结构轻量化设计中的广阔应用前景，研究了弹性、黏弹性变刚度复合壁板在亚音速流场中的气动弹性稳定性问题. 首先，基于Mindlin厚板理论和势流流动理论分别描述壁板结构变形和亚音速气动力，根据虚功原理和有限元法建立了曲线纤维变刚度复合材料弹性/黏弹性壁板的气动弹性稳定性分析模型，进而采用复模态理论求解复合材料变刚度壁板发散临界速度；在验证方法正确性和收敛性的基础上，研究了壁板关键参数等对复合变刚度壁板发散失稳特性的影响规律. 研究结果表明:与直线纤维壁板相比，通过调整曲线纤维路径可以实现壁板的发散临界速度50%左右的提升，有效增强壁板气动弹性稳定性. 

Aeroelastic Instability of Variable-Stiffness Panels with Curvilinear Fibers in Subsonic Flow

In view of the extensive application of curved fiber composite laminates in the lightweight design of high-speed train structures, the aeroelastic stability of elastic and viscoelastic variable-stiffness composite panels in a subsonic flow field was studied. First, classical thick theory along with a Mindlin plate was adopted for structural modeling and potential flow theory for aerodynamic modeling. An aeroelastic model of composite variable-stiffness panels with curvilinear fibers was then established adopting the principle of virtual work and the finite element method, which was solved using complex mode theory in the frequency domain. The divergence characteristics for key parameters were investigated following verification of the validity and convergence of the presented method. Numerical results show that, relative to the straight-fiber panel, the critical divergence speed can be increased by approximately 50% by varying the path orientations of the curvilinear fibers.