Research On Perfermance And Technology Of Stratospheric Airship

Airships as stratospheric platform have large value in telecommunication services and military applcaiton. Their have been closely attend for nearly thirty years in those strong military countries. With the background of the stratospheric platform R&D project in China, this dissertation summarizes characteristics, application, systems and some technology of airship. Then, the airship modeling, figuration optimization and parameter analysis are studied in this thesis.In the context, parametic modeling method is used for stratospheric airship geometric modeling, and it can save considerable amount time required for aerodynamics analysis and figuration design. At the same time, airship with lemniscate and roseline profile is also studied to analyze their characteristic of drag. It's found that airship is fit to control and has enough buoyanch when its slenderness radio is approximately four. So an improved trilobal roseline is described as a good profile. Surrogate model is introduced in the progress of figuration optimization of the airship. With Latin Squares Experiment Design to show samples and Kriging Approximation Approaches, we build the surrogate model for aerodynamical analysis. And then the figuration of stratospheric airship is optimized to have minimal weight in Isight. Finally, in the base of figuration optimization, the affect to weight and size of airship as a result of improving of much technology such as driving, energy, and material is studied, and this article figure out the direction of technology about stratospheric airship which should be developed.