Abstract

Aiming at the problem that icing leads to poor aerodynamic characteristics and affects the safe flight of aircraft. This paper takes the simplified model of NASA’s Civil Aircraft Research Model (CARM) as the research object establishing longitudinal dynamics model and icing effects model. Based on the optimal control theory of reachable set, the backward reachable set is proposed as the safe flight envelope,which used to analyze the influence of icing on flight safety.It is shown that with the increase of icing degree, the control range of key flight parameters is narrowed, and the possibility of aircraft stall is increasing. The evaluation results are consistent with the actual situation, which can provide some reference for the pilot control.

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