Short takeoff performance optimization based on simulation model

Short takeoff performance is important for all kinds of special aircrafts because they can accommodate more pay load and get higher safety during short takeoff and landing than vertical takeoff and landing. Short takeoff simulation model was established for a small unmanned tilt rotor aircraft based on its longitudinal flight dynamics model. The genetic algorithm was applied to shorten the takeoff distance as objective function by optimizing the control variables. The results of optimization show that the takeoff distance can be minimized by suitable elevator control method and there is an optimal tilting angle of engine nacelles for any given gross weight to further shorten takeoff distance. In addition, continuously tilting engine nacelles according to optimized control method also benefits the short takeoff performance. Considering the essential mathematical characteristics of simulation model and optimization algorithm, this method can be generally applied to short takeoff performance optimization for any other aircrafts including conventional fixed-wing airplanes and helicopters.