论文部分内容阅读
实现机翼在不同的飞行状态下的最优气动外形是自适应机翼的一项关键技术。针对传统铰链机构会使机翼表面产生不连续变化从而导致气流提早分离的问题,具有连续平滑变形和轻量化特点的柔性机构受到重视。根据机翼后缘在不同飞行状态下气动外形的要求,以目标形状与实际形状的距离为最小优化目标,对柔性机构进行了拓扑优化。在优化方法上,传统的拓扑优化方法因参数化对象为结构微元,不可避免的存在棋盘化等现象,本文中采用的拓扑优化方法以载荷路径为参数化对象,同时在约束中引入连接性要求,有效的避免了优化结果物理不可实现的情况。结合实例,运用Isight联合Patran、Nastran进行多学科仿真分析。结果表明:该柔性机构能够实现预期的形状变化。
Achieving optimal aerodynamic shape of the wing at different flight conditions is a key technique for adaptive wing. In view of the problem that the traditional hinge mechanism causes discontinuous changes of the airfoil surface and leads to the early separation of airflow, the flexible mechanism with continuous smooth deformation and light weight has drawn great attention. According to the requirements of the aerodynamic profile of the trailing edge of the wing under different flight conditions, the minimum optimization goal is the distance between the target shape and the actual shape, and the topology of the flexible mechanism is optimized. In the optimization method, the traditional topology optimization method is due to the parameterized objects being structural elements and inevitably the phenomenon of chessboard. The topology optimization method adopted in this paper takes the load path as the parameterization object, and at the same time introduces the connectivity in the constraints Requirements, effectively avoid the optimization results of the physical unrealized situation. Combined with examples, we use Isight in combination with Patran and Nastran to carry out multi-disciplinary simulation analysis. The results show that the flexible mechanism can achieve the desired shape change.