积冰对飞机操纵性的影响与仿真

采用积冰程度参数描述积冰对飞机气动参数的影响;将积冰程度参数引入飞机六自由度非线性动力学模型,建立了随积冰严重程度而变化的时变飞机仿真模型,并以此为基础设计了高度保持模式和滚转角保持模式两种飞机自动驾驶闭环仿真系统.通过与飞行试验数据对比,验证了仿真模型的正确性.在一定的飞行条件和积冰遭遇情况下,对开环和闭环飞机的飞行进行了仿真计算和分析.仿真结果表明:积冰对飞机的配平特性、响应特性以及自动驾驶性能均造成不良的影响,对飞行安全构成了一定的威胁.

Simulation of ice effects on aircraft controllability

The aircraft icing parameter was used to describe the ice effects on the aircraft.A nonlinear six degree-of-freedom computational flight dynamics model was built.The aircraft icing parameter was taken into the flight dynamics model to build up a time-varying simulation model.On this basis,two autopilot modes,namely,the altitude hold mode and roll attitude hold mode were designed.Furthermore,the simulation model was verified by comparing to the flight test data.Eventually,simulations of both open loop and autopilot mode were taken under certain fight condition and icing environment.The results of simulations show that icing has several adverse effects on the controllability of aircraft,including trimming characteristics,response characteristics,and the autopilot performance.