Comprehensive control method for keeping fixed-point height of airship in stratosphere

Abstract

The invention relates to a comprehensive control method for keeping a fixed-point height of an airship in the stratosphere, which is used for keeping the fixed-point height of the airship in the stratosphere by adopting a combined mode of pressure adjustment and thrust vector. The method has the advantages of small fluctuation range of the fixed-point height and great corresponding reduction of the reserve volume of an auxiliary ballonet. To be explained, the application of the thrust vector does not increase extra energy consumption because the airship in the stratosphere always keeps a certain thrust in a fixed-point flight in order to overcome the wind resistance; According to the method, only the direction of the thrust is changed and an increased net buoyancy is balanced by utilizingthe component in the vertical direction, which can result in that the component in the horizontal direction cannot overcome the wind resistance so that the position precision of the airship in the stratosphere in the horizontal direction cannot be kept; however, in terms of engineering application, the expense of a little horizontal positioning precision is worthy because the fixed-point height position of the airship in the stratosphere is far more important than the horizontal position precision thereof; and the airship in the stratosphere can flexibly fly to a fixed-point position once thetemperature returns to normal.

Description

technical field [0001] The invention relates to the field of stratospheric airships. technical background [0002] The stratospheric airship is a kind of floating aircraft, which relies on static buoyancy to stay in the air, is powered by solar energy and fuel cells, and has a propulsion system. Long-term fixed-point hovering or low-speed maneuvering flight at an altitude of 50 kilometers. All airships have a main airbag filled with buoyant gas (usually helium) and a secondary airbag filled with air. The aerodynamic shape of the airship is maintained by the overpressure inside the airbag, such as figure 1 shown. During the ascent of the stratospheric airship, the atmospheric pressure decreases continuously, and the airbag will inflate, and the air valve needs to be opened to release the air in the auxiliary airbag to reduce the gas pressure in the airbag; while during the descent of the stratospheric airship, the atmospheric pressure continues to increase, and the airbag w...

AI Technical Summary

Problems solved by technology

For stratospheric airships, due to the thin atmosphere at high altitudes and the slow speed of the airship, the rudder surface adjustment is invalid.

At present, research on stratospheric airships at home and abroad is only in the stage of exploration and demonstration, and there is no mature method for how to keep the stratospheric airships at a predetermined altitude during the long-term fixed-point stay in the air

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