Analysis & Manufacturing of Composite Airframe for Uniaxial Unmanned Aerial System (UAS)

该项目的工业合作伙伴Airvinci正在开发一种同轴旋翼机，该旋翼机配备了有人驾驶和无人驾驶的管道风扇。增加旋翼机的有效载荷是达芬奇的主要目标，因为它将增加燃油经济性和机动性。因此，根据FAR第27部分，Airvinci希望复合材料机身满足所有规定。复合材料机身需要进行优化，以承受所有飞行载荷以及着陆阶段的冲击载荷耗散。拟议项目的两个主要目标是：1。直接用等效的复合材料取代现有的钢空间框架。设计一种优化的减少冲击的复合材料机身，因此研究工作将集中在以下方面：非线性显式动态结构分析根据FAR第27部分标准，机身需要具有耐撞性。因此，需要证明机身在动态载荷下不会明显变形或回弹。传统的有限元模型利用线性求解器进行静力分析和小位移。为了准确地估计机身的耐撞性和起落架的吸能能力，需要一个明确的非线性模型。非线性模型将允许更复杂的失效模式以及动态分析。一个显式求解器将允许模拟着陆。设计优化复合材料的各向异性特性允许对设计负载进行大量裁剪。使用ANSYS中可用的包的组合，可以确定层的方向以及它们的堆叠顺序。由此产生的设计也将针对制造进行优化，以避免复杂的工装。

The project industrial partner, Airvinci, is developing a coaxial rotorcraft with a ducted fan in both manned andunmanned types. Increasing the payload fraction of the rotorcraft is Airvinci's major objective as it wouldincrease fuel economy and maneuverability. As a result Airvinci desires a composite airframe that meets allregulations according to FAR part 27. The composite airframe will need to be optimized to endure all flightloads as well as impact load dissipation during the landing phase. The two main objectives of the proposedproject are:1.Direct Replacement of an existing steel spaceframe with composite equivalent.2.Design of an optimized impact reducing composite airframeThe research effort will therefore focus on the following:1.Non-linear Explicit Dynamic Structural AnalysisThe airframe will need to be crashworthy according to FAR part 27 standards. Therefore, it will be required toshow that the airframe will not deform significantly or will springback under dynamic loads. Traditional FEmodels utilize linear solvers for static analysis and small displacements. For an accurate estimation towards theairframe's crashworthiness and energy absorbing capabilities of the landing skids, a Non-linear model explicitmodel will be required. The nonlinear model will allow for more complex failure modes as well as dynamicanalysis. An explicit solver will allow for simulating the landing.2.Design OptimizationThe anisotropic properties of composites allow for a great deal of tailoring towards the design loads. Using acombination of the packages available in ANSYS it is possible to determine the directions of the plies as wellas their stacking sequence. The resulting design will also be optimized for manufacturing to avoid complextooling.