高空台进气控制系统压力PI增益调度控制研究

Aiming at the problem of pressure accurate control of altitude ground test facilities (AGTF) air intake control system (AICS) over the whole working range, a PI gain scheduling control design method based on AGTF AICS pressure is proposed. Meanwhile, based on the theory of pipeline heat flow dynamics, a variable specific heat capacity modeling approach of pipe control volume is presented, which can reduce the modeling uncertainties comparing with the constant specific heat modeling approach. On the basis of considering the AICS modeling uncertainties caused by variable specific heat pipe volume, control valve flow characteristics, hydraulic servo system dynamics and sensor gain, a complete and accurate mode of AGTF AICS is established. Then, 24 steady state points over the whole working range of AICS are chosen to design the optimal PI controllers at each point, which are used as the basis of PI gain schedule controller in the large transient work. Compared with control effects of traditional PI control design method, those of the method in this paper have better consistency and performance according to digital simulation. Furthermore, the effectiveness of the proposed design method is verified by the semi-physical simulation and the steady state error is less than 0.1%.