复合材料曲壁板与平壁板热颤振特性的对比

Thermal flutter characteristics comparison between flat and curved composite panels

对比研究了层合复合材料曲壁板和平壁板热颤振特性。分别建立三种铺层方式的曲壁板和平壁板的有限元模型。采用分步求解方法,首先计算热效应引起的附加刚度,然后将其引入到壁板颤振模型中进行颤振分析。分析了不同铺层方式曲壁板和平壁板的热颤振特性,结果表明壁板颤振临界速度随温升近似呈线性下降,正交各向异性铺设的曲壁板与准各向同性铺设的曲壁板相比,其颤振临界速度下降率更大,而平壁板情况刚好相反;不同铺层方式曲壁板的热颤振危险模态不同,而平壁板热颤振危险模态不受铺层方式的影响。

A comparison of thermal flutter characteristics between flat and curved composite panels was presented.Three layup types were introduced to form laminated panels modeled with finite element method（FEM）.The nonlinear static analysis was firstly implemented to evaluate thermal effect on structural stiffness and high supersonic flutter analysis was then performed on the panel with the updated rigidity.The second order piston theory was employed to represent high supersonic aerodynamics and the flutter speed was predicted with PK method.It was found that the flutter speed of the heated panels decreases linearly with temperature increasing;this decreasing rate is less for quasi-isotropic laminated panels compared with that for orthotropic laminated ones in the case of curved panels;whereas the flat panel case is on the contrary.The results showed that flutter modes of curved panels are strongly dependent on the layup type;however,flutter modes of flat panels keep consistent.