结冰对飞机横航向飞行品质的影响

Influence of icing on lateral directional flying qualities of aircraft

针对结冰后飞机横航向飞行品质问题,引入结冰影响模型,对不同结冰条件下的飞行动力学特性进行仿真。基于仿真结果和典型模态特性,利用等效系统拟配原理在时域范围内对飞机结冰后的滚转角变化进行了分析。提出基于典型模态下对飞机横航向时域响应进行拟合,从而计算出结冰后横航向模态特性参数的方法。根据计算结果,分析了不同结冰严重程度对飞机横航向飞行品质的影响。仿真结果表明,结冰后飞机横航向模态特性变差,飞行品质发生降级,对飞行安全构成了严重威胁。

This paper mainly analyzed the lateral directional flying qualities of aircraft in the presence of icing. With the introduction of icing effects model,the flight dynamic characteristics under different icing conditions were simulated. Based on the simulation and typical mode characteristics,the equivalent system matching principle was used to analyze the roll angle changes of aircraft experiencing icing in time domain. The paper proposed to use the typical mode to fit the lateral directional time-domain response of the aircraft so as to calculate the lateral directional mode parameters. Based on the calculation results,the effects of various icing severity on flight qualities was analyzed. The simulation results indicate that characteristics of the lateral directional mode and flying qualities of aircraft experiencing icing deteriorate,and the flight security is threated seriously.