基于精确参数化定义的复合材料桨叶剖面扭转刚度计算

Cross-section torsion stiffness calculation of composite rotor blade based on accurate parametric definition

在系统地对桨叶结构设计流程、结构分析计算方法进行研究的基础上,通过对桨叶组件参数化定义及桨叶铺层三维几何建模方法的扩展,自动获得各桨叶剖面相关组件的几何和材料信息,并基于闭口薄壁梁理论,给出了复合材料桨叶剖面扭转刚度的高效计算方法.该方法一方面充分考虑了复合材料蒙皮铺层的复杂结构以及梁、肋等组件的细节几何模型,避免了三维几何模型简化误差;另一方面,提出了铺层块、等效厚度以及长厚比概念,并采用解析表达,将模型几何解构完全集成于桨叶设计过程自动完成,十分便于工程应用.实例验证表明:提出的方法能够快速、可靠地完成桨叶剖面扭转刚度计算,显著提高设计分析效率.

A new method was proposed to improve the calculation of the composite rotor’s torsion stiffness.First,the flow of the blade’s structure design and analysis were studied.Then,all the material and geometry profile information of the blade construction were obtained by expanding the methods of blade parametric module definition and blade geometric modeling.Finally,the efficient calculation equations for cross-section torsion stiffness of composite rotor blade were derived based on the thin-box beam theory.One of the advantages of the proposed method lies in that the precision loss of model simplification is eliminate by taking the blade’s refined geometric model.On the other side,by importing the ply block,equivalent thickness and slenderness radio conception,and due to the analytical form of the calculation and the automatic geometric extraction,this method is quite suitable for practical use.Experimental results demonstrate that the method can complete the blade structure design and analysis efficiently.