Optimization Method of Composite Blade Lay-up Considering Bent-Twist Coupling Effect

考虑弯扭耦合效应的复合材料叶片铺层优化方法

¹ School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an 710072, China
² School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China

Received: 28 September 2017

Abstract

In the design of composite blades, the bent-twist coupling effect can be used to reduce the aeroelastic deformation of the blades by lay-up optimization design to improve the efficiency of blade structure. In this paper, the composite blade was simplified as symmetric unbalanced cantilever laminate, and based on the classical laminated theory(CLT), two analysis parameters are proposed:the stiffness weights and load factors. The influence of the two analysis parameters on the structural deformation of the bent-twist coupling effect is studied by experiments and finite element analysis(FEA). The symmetrical laminated plates containing 0°, 90° and ±45° plies were analyzed and calculated with the feasible region of stiffness weights as the constraint condition and the minimum blade curvature as the objective function, and the optimal path of the stiffness weights relate to the load factors was obtained. A 16-plies symmetric laminated plate was used as an example to verify the optimal path of the stiffness weights. By the inverse calculation of the optimal path of the stiffness weights, the optimal ply sequences can be obtained. The method of this paper may provide some references and basis for the optimal design of the composite blades.

摘要

在复合材料叶片设计中，可利用弯扭耦合效应进行铺层优化设计，通过减小叶片气动弹性外形的改变来提高叶片结构的效率。将复合材料叶片简化为对称非均衡悬臂层合板，基于经典层合板理论提出刚度权值和载荷系数2个分析参数。并采用试验和有限元模拟分析了弯扭耦合效应中分析参数对结构变形的影响。进一步以刚度权值的可行域为约束条件，叶片曲率最小为目标函数，对含有0°，90°和±45°铺层的对称层合板进行分析计算，得到关于载荷系数的刚度权值最优路径。并以16层对称层合板为例进行了验证计算。通过对刚度权值最优路径的逆向计算，能够快速得到满足设计条件的最优铺层顺序。该方法可为复合材料叶片的铺层优化设计提供一定的参考和依据。