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通过考虑旋翼滑流对机翼、平尾和垂尾的气动干扰,结合叶素理论及动量理论,建立带外吊挂载荷的倾转旋翼机飞行动力学模型。在此基础上,以倾转旋翼机XV-15为例,在MATLAB平台上采用Levenberg-Marquardt算法对模型进行定常直飞状态配平计算,并将结果与NASA数据对比,验证了模型的正确性,分析了在不同飞行速度及飞行模式下外吊挂物对其飞行操纵量和姿态角的影响。计算结果显示:在直升机模式下,外吊挂对总距影响较大,对俯仰角的影响随着速度的增加而逐渐减小,这与传统直升机相比有所不同;在过渡阶段,外吊挂可有效减缓俯仰角的减小,并且减小纵向操纵量;在固定翼模式下,不建议使用外吊挂模式飞行。
The aerodynamic model of tilt rotorcraft with out-of-plane suspension load is established by considering the aerodynamic interference of the rotor slipstream to the wing, the tail and the tail, and the valence theory and momentum theory. On the basis of this, taking the tilting rotorcraft XV-15 as an example, the Levenberg-Marquardt algorithm is used to calculate the steady state of the model in the direct flight state. The results are compared with NASA data to verify the correctness of the model, The influence of external suspended objects on their flight control and attitude angle under different flight velocities and flight modes is analyzed. The calculation results show that in the helicopter mode, the external suspension has a great influence on the total distance and the influence on the pitch angle decreases with the increase of the speed, which is different from the traditional helicopter. During the transitional period, the external suspension Hanging can effectively reduce the pitch angle reduction, and reduce the amount of longitudinal manipulation; in fixed-wing mode, it is not recommended to use the outer suspension mode of flight.