Stability and Open-Loop Dynamics of Very Flexible Aircraft Including Free-Wake Effects
Stability and Open-Loop Dynamics of Very Flexible Aircraft Including Free-Wake Effects
复制标题
非常灵活的飞机的稳定性和开环动力学，包括自由尾流效应
DOI：
10.2514/6.2011-1915
复制
发表时间：
2011
影响因子：
2.2
通讯作者：
J. Graham
中科院分区：
文献类型：
--
作者：
J. Murua;H. Hesse;R. Palacios;J. Graham
本文研究了大柔性轻型飞机的非线性气动弹性与飞行力学耦合问题。一个几何精确的复合梁配方是用来模拟非线性柔性体动力学，包括刚体运动。气动力模型采用三维非定常涡格法，该方法可以捕捉升力面和自由尾迹的瞬时形状，包括大位移和干扰效应。耦合的控制方程以多种方式求解，允许整车的线性和非线性时域模拟以及围绕配平配置的频域线性稳定性分析。由此产生的框架的模拟高展弦比飞机（SHARP）提供了一个中等保真度的表示灵活的飞机动力学，基于一个直观的和容易线性化的结构表示，使用位移和笛卡尔旋转矢量，时域空气动力学，并在相对较低的计算成本。以前的验证研究的结构动力学和空气动力学模块的补充，在这里与研究的柔性机构的实施和综合仿真方法。最后，对一典型的高空长航时模型飞机进行了数值计算，研究了其稳定性和开环动态响应。
The paper investigates the coupled nonlinear aeroelasticity and flight mechanics of very flexible lightweight aircraft. A geometrically-exact composite beam formulation is used to model the nonlinear flexible-body dynamics, including rigid-body motions. The aerodynamics are modeled by a general 3-D unsteady vortex-lattice method, which can capture the instantaneous shape of the lifting surfaces and the free wake, including large displacements and interference effects. The coupled governing equations are solved in a variety of ways, allowing linear and nonlinear time-domain simulations of the full vehicle and frequency-domain linear stability analysis around trimmed configurations. The resulting framework for the Simulation of High-Aspect Ratio Planes (SHARP) provides a medium-fidelity representation of flexible aircraft dynamics, based on an intuitive and easily linearizable structural representation using displacements and the Cartesian rotation vector, time-domain aerodynamics, and at relatively low computational costs. Previous verification studies on the structural dynamics and aerodynamics modules are complemented here with studies on the flexible-body implementation and on the integrated simulation methodology. A numerical investigation is finally presented on a representative high-altitude long-endurance model aircraft, investigating its stability properties and its open-loop dynamic response.