16. Performance Simulation of Serviceable Stratospheric Balloon Control Using MATLAB/Simulink

The design of serviceable stratospheric balloon requires descent control mechanism to make it safe and reliable. On the basis of balloon dynamics, heat and mass transfer aspect, Gas-Compress-Release control model that is developed before used to describe the ascent, descent and flight processes for high altitude zero pressure balloons. The behavior of the balloon system during safe landing has been numerically investigated for the first time. The model was validated using NASA test flight. The effect of PID control on compress-release mechanism is discussed in detail. It was found that with the sacrificial flight Gas-Compress-Release model it is possible to place the balloon at its orbit, to extend flight time and to interfere with the balloon system whenever needed for technical service without using ballast. The results are helpful for the design and operation of safe and reliable serviceable high altitude stratospheric balloons.