论文标题
同轴复合直升机的混合装饰策略
A Hybrid Trim Strategy for Coaxial Compound Helicopter
论文作者
论文摘要
对于高速和高势能的特征，对同轴复合直升机（CCH）的兴趣一直在增加民航和工程社区，并且在可预见的未来很可能会继续这样做。由于CCH中的控制与常规直升机完全不同，因此冗余控制策略设计是最大的挑战之一。在这项研究中，基于XH-59A的CCH模型旨在研究螺旋桨和电梯对飞行性能的影响。提出了四个具有不同目标的修剪策略，然后进行比较以找到最佳控制分配。采用启发式下降搜索方法来搜索螺旋桨和电梯的最佳速度。通过在预先配置的螺距角度安排方面，可以在0-100m/s的速度范围内使用混合装饰策略，在中等和高速下需要大量的功率提高。获得的相应控制变量位于合理的控制范围内，最大功率在100m/s时降低了13％，这展示了混合装饰策略的潜力。
Interest in the coaxial compound helicopter (CCH) has been increasing in the civil aviation and engineering community for its high-speed and high-maneuverability features, and is likely to continue to do so for the foreseeable future. Since the control in CCH is totally different from the conventional helicopter, the redundant control strategy design is one of the biggest challenges. In this study, the CCH model based on XH-59A is built to investigate the impact of the propeller and the elevator on the flight performance. Four trim strategies with different objectives are proposed and then compared to find the optimal control allocation. A heuristic descent search method is applied to search the optimal velocity at which the propeller and the elevator are engaged. A significant improvement of power required at medium and high speed with acceptable rotor airloads increment was found by using the Hybrid Trim strategy in the speed range of 0-100m/s, with regard to a pre-configured pitch angle schedule. The corresponding control variables obtained locate in a reasonable control range, with a maximum power reduced of 13% at 100m/s, which showcases the potential of the Hybrid Trim strategy.
