纵向阵风扰动下典型通航飞机俯仰角响应

为了研究飞机的纵向气动参数(CLα、CDα、Cmα、Cmα.、Cmq)以及平飞速度( Lw)、翼载荷(V0)等参数对抗风性能的影响,在满足 MIL-F-8785C中规定的一级飞行品质条件下:首先,选取 5种代表机型对其进行风场扰动下的动态响应仿真计算,得到了这 5种飞机在阵风风场和紊流风场扰动下的航迹和姿态角响应；然后,逐个改变飞机的纵向气动参数及平飞速度、翼载荷等参数,对不同参数的抗风性能影响进行灵敏度分析；最后,分析得到,对于同一架飞机,增加升力线斜率、俯仰阻尼系数、平飞速度这 3个参数的绝对值会让飞机纵向抗风性能变好,增加静稳定裕度、翼载荷这 2个参数的绝对值会让飞机纵向抗风性能变差。该结论可以为飞机设计过程中就如何提高飞机的抗 风性能提供参考。

Pitch Angle Response of Typical Navigation Airplanes in the Disturbance of Longitudinal Gusty Wind Field

In order to research the contribution of longitudinal aerodynamic parameters of the aircraft to the wind-resistanceperformance of the aircraft, a six degrees of freedom dynamics and kinematics simulation calculation is operated on the fivekinds of typical airplanes selected, under the condition of satisfying the first-level flight quality standard specified in MIL-F-8785C. It is obtained that the dynamic response of the airplanes in the disturbance of the longitudinal wind field, includ.ing the flight path and attitude response. Then, several key parameters which may affect the longitudinal wind-resistanceperformance of the aircraft are changed one by one. Through sensitivity analyzing, there are five parameters found to have agreat influence on the longitudinal wind-resistance performance of the aircraft. Increasing the absolute values of the lift-curve slope, the pitch damping and the flight speed, can improve the wind-resistance performance of the aircraft. Besides,increasing the absolute values of the static stability margin and the wing load, will make it worse. The conclusion can pro.vide a reference for the research of improving the wind-resistance performance of the aircraft in the process of aircraft de.signing.