基于非线性梁理论的复合材料机翼气动弹性优化研究

将复合材料机翼模拟成盒形梁。考虑变形的几何非线性,建立简单、精确的气弹模型进行优化裁剪研究。以颤振速度为约束条件,运用均匀导数准则对复合材料各铺层厚度进行优化,以获得质量最轻的设计。研究表明:机翼一阶扭转模态是颤振危险模态。颤振速度对复合材料45o铺层敏度最大。优化结果中增加了45o铺层厚度以增加结构扭转刚度,减小了0o和90o铺层厚度以优化质量。将低阶非线性梁模型与均匀导数准则相结合的方法具有精度合理、收敛快的优点,适用于复合材料机翼的气弹工程优化。

Aeroelastic Tailoring of Composite Wing Based on Nolinear Beam Theory

A simple,accurate aeroelastic model is developed to perform aeroelastic tailoring study of a composite wing,which is modeled as a nonlinear box-beam.Flutter speed of the wing is considered as constraint,and ply thicknesses are optimized by uniform derivativation criteria to get minimum weight design.Results shown that first wing torsion mode is the critical mode of flutter;flutter speed is most sensitive to 45° plies.In the final optimized results,the thicknesses of 45° plies are increase to enhance structural torsional stiffness,while the thicknesses of 0° and 90° plies are reduced to optimize weight.The combined low order nonlinear beam model and uniform derivation criteria method,which has good accuracy and fast convergence,is suitable for engineering aeroelastic optimization of composite wing.