Abstract: A new fixed-point adjustment method of airship is proposed. Static and thermodynamic model of the fixed-point adjustment method is also developed. On this basis, the model is solved by the Runge-Kutta method. In the result, the temperature performance of the helium bag, vice helium bag and outer membrane of the airship are obtained, and the influences of sunshine time and seasons on the above results are conducted. The results show that the temperature of these parts on the airship increase first, and then decrease, in which the temperature of the membrane is the lowest, the temperature of the helium bag and the vice helium bag are relatively close, and the three temperatures reach the maximum at about 13h. On the winter day, the temperatures of the three parts of the airship are lower than that on the summer day, and the temperature differences between each other are greater. At different latitudes, the changing trend of the temperature of the helium bag, vice helium bag and outer membrane are the same. With the increase of latitude, the temperature of the helium bag, vice helium and bag outer membrane increase, but the maximum temperature decreases with the increase of latitude which is consistent with the solar radiation intensity at different latitudes. At the same time, the minimum mass of the pressurized helium increases with the increase of latitude, but the increment is little. Further, the temperature is less affected by the latitude relative to the seasons. The results provide a technical reference for the fixed-point flight control and the research on the thermal performance of the airship.

Key words: floating, helium bag, numerical simulation, the stratosphere airship, thermal performance