Study On The Fixed Point Of The Airship Based On Characteristic Model

In this paper,the fixed-point problem of stratospheric airship is studied in depth.In the case of stratospheric airships,the temperature of the skin and the internal gas will fluctuate significantly under the conditions of changes in the thermal radiation environment,which in turn will cause changes in the pressure inside the airbag.It is necessary to maintain the normal pressure range of the airship by suction and exhaust.This will cause the buoyancy of the airship to change,which in turn will change the altitude.This paper considers the influence of stratospheric wind field and thermal radiation environment,and discusses the fixed-point control of airship.First,the development history of the airship and the research status of the airship’s fixed point are introduced.Under the influence of the external thermal environment and the stratospheric wind field,the airship will shift to a certain position.Then it analyzes the external environment of the airship,establishes the internal gas thermal model of the airship,and designs the airship pressure control strategy,and obtains the real-time values of the airship’s mass,pressure and skin temperature changes during the airborne period.On the one hand,these parameter changes have a certain reference role in the selection of parameter perturbation values,on the other hand,it leads to uncertainty in the airship model.In the end,this paper adopts the adaptive control method based on the characteristic model,combined with the guidance method and the method of wind field state transformation to realize the fixed-point control of the airship on the two-dimensional plane.Through Matlab simulation,a comparison between the adaptive control method based on the characteristic model and the PD control method is carried out,highlighting the superiority of the adaptive control method of the characteristic model.The use of the adaptive control method based on the characteristic model ensures the consistent performance of the system when the parameters such as quality change,solves the problem that the system cannot be accurately modeled,and realizes the fixed-point control of the airship in the two-dimensional plane.