| The stratospheric airship is a kind of aeronautical platform, which could stay longer in a specific area than most traditional aircrafts. It is buoyed up by lighter-than-air gas and powered by solar energy and propulsion system, which cannot be affected by geographical location and weather conditions and. Because of its high value on national defense and civil affairs, the stratospheric airship becomes a hot issue around the world.The main work is as follows:Firstly, dynamic model, thermodynamic model and thrust system model of the ascending trajectory of the stratospheric airship are established. Dynamic model reflects general force situation and thermodynamic model reflects heat transfer situation between the atmosphere and the airship while thrust system model reflects the variation of the thrust of airship propeller with the change of the rotational speed of the airship propeller and the speed of the airship.Secondly, the genetic algorithm is employed and the simulation of the ascending trajectory is conducted according to the established model of the ascending trajectory of the stratospheric airship. Then the influence of the selection of the parameter of the genetic algorithm on the simulation is analyzed and the simulation precision and simulation time are discussed.Thirdly, combined with the established model of the ascending trajectory of the stratospheric airship, the simulation of the change of each state variable under different take off time, attack angles, air quality and helium quality conditions is conducted and the change tendency of energy consumption of the ascending trajectory of the stratospheric airship in different conditions is compared.Lastly, the genetic algorithm is employed to segment the ascending trajectory of the stratospheric airship. Then the integrated simulation is conducted based on two kinds of model parameters and the comparative optimization of two kinds of segments is analyzed. |
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