| A pressure signal with high precision and quick response is required to generate in the hardware-in-the-loop simulation of manned spaceflight's reentry process. In this thesis, the mathematical model of air pressure control is already built by others. The influences of parameters of the system and different control methods on the performances of the system are studied through simulation. At last, the equipment is fixed to provide high precision and quick response signal of air pressure.First of all, according to the background of the system, some parameters of the system performances are put forward for the system. And some related technologies are introduced. After that, we introduce how the system works. Then, mathematical model of air pressure control is built on the basic theory of pressure change of air. Some simulations are done to research on the parameters of the system's influence on the performance of the system.Afterwards, the control algorithms applied to the system were studied. PID control and Fuzzy control algorithms can not achieve good control effect. Because PID control algorithm is difficult to adapt to change of system Parameters. It is because of the serious nonlinearity of pneumatic system. Fuzzy control algorithm can not achieve high precision of the result. Fuzzy and PID control algorithm need not knowing exact model of system and has good adaptive ability to the change of system Parameters, which is suitable for the pressure servo control system. Some simulations are doing to check the Capability of the three control algorithms with the pressure control system.At last, hardwares were used to manufacture the equipment. Fuzzy-PID controller was used to control the hardware system. Some experiments are done to test the performance of the system. The result shows the equipment can provide high precision and quick response signal of air pressure which satisfied the needs of the hardware-in-the-loop simulation of manned spaceflight's reentry process. |
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