气动弹性剪裁中的设计变量和约束导数

1.前言 设计变量的取法和约束导数的计算,不但影响气动弹性剪裁的结果,而且决定着它的工作量。本文对于两种不同的设计变量取法进行了讨论。在约束导数计算方面,通过一个盒段模型和一个三角翼模型的计算,进行了对比。

DESIGN VARIABLES AND CONSTRAINT DERIVATIVES IN AEROELASTIC TAILORING

Two important point in aeroelastic tailoring, i.e., determination of design variables and calculation of constraint derivatives were discussed. Two different methods in the determination of the design variables were evaluated. It seems that the polynomial expression of the thickness of the composite ply of the skin is more beneficial in practical application. By use of a simple box model and a delta wing model, the calculation of the derivatives of normal frequencies, mode shapes as well as flutter speeds are performed. Derivatives of normal frequencies and mode shapes calculated by stiffness and flexibility methods are all reasonable. In the calculation of the derivatives of flutter speeds, the effect of mode shape can be neglected.