Research Initiation: Design Methodology for Advanced Composite Rotary-Wing Structures

本研究的目的是改进设计 和分析方法，目前用于先进的复合材料旋转- 机翼结构 研究结果涉及 发展了：（1）非均匀的精细结构理论 各向异性梁，和（2）加载的优化设计方法， 形状关键型应用。 精化梁理论是由 扩展现有的一维各向异性梁理论， 包括非均匀性和横向剪切的影响。 这 理论，这是一个扩展的鲁申科的梁理论，使用一个 剪切修正系数的扩展集，由 圣维南的弹性解决方案优化技术， 确定柔性叶片初始形状的重量最小化， 检查应力和稳定性边界， 变量包括叶片几何形状和材料定义。 这些设计方法将对未来旋翼机的设计产生影响 结构. 复合材料将被更智能地使用， 因此叶片形状可能改变。 刀片的主要改进 推进效率是可能的，这将导致大量的 为下一代飞机节省燃料。

The objectives of this research are to improve the design and analysis methods currently used for advanced composite rotary- wing structures. The outcome of the research involves the development of: (1) a refined structural theory for nonhomogeneous anisotropic beams, and (2) an optimum design methodology for loaded- shape-critical applications. The refined beam theory is developed by extending existing one-dimensional anisotropic beam theories to include the effects of nonhomogeneity and transverse shear. This theory, which is an extension of Timoshenko's beam theory, uses an extended set of shear correction factors that are determined by Saint-Venant's elasticity solutions optimization techniques to determine the initial shape of a flexible blade weight is minimized, the stresses and stability boundaries are checked, and the design variables include the blade geometry and material definition. These design methods will impact the future design of rotary-wing structures. Composite materials will be used more intelligently and blade shapes may changes as a result. Major improvements in blade propulsive efficiency are possible, which would result in substantial fuel savings for the next generation of aircraft.