飞机安全性设计是飞机设计的重中之重,影响飞行安全的因素很多,如升降舵非指令偏转就会给飞行安全带来一定的威胁。首先,利用Matlab/Simulink工具建立了六自由度仿真模型,给定升降舵不同形式的偏转方式;然后,利用该模型对迎角、法向过载以及飞行高度随时间的变化进行了实时仿真,通过仿真结果分析了升降舵非指令偏转对飞行安全的影响;最后,从分析结果确定了安全分析中的危险等级,可为飞机设计提供理论参考和工程指导。 Aircraft safety design is the most important aircraft design, there are many factors that affect flight safety, such as elevator non-directive deflection will give flight safety a certain threat. First of all, six-degree-of-freedom simulation model is established by using Matlab / Simulink tool. Different deflection modes of elevator are given. Then, the model is used to simulate real-time changes of angle of attack, normal overload and flight altitude with time. Results The influence of non-command elevator deflection on flight safety was analyzed. Finally, the dangerous level of safety analysis was determined from the analysis results, which could provide theoretical reference and engineering guidance for aircraft design.