高空台进气控制系统压力PI增益调度控制研究

关键词:高空模拟试验台；进气控制系统；变比热容腔模型；增益调度；半物理仿真

关键词:  高空模拟试验台  进气控制系统  变比热容腔模型  增益调度  半物理仿真

Key words:  Altitude ground test facilities  Air intake control system  Variable specific heat capacity volume model  Gain scheduling  Semi-physical simulation

摘要:

针对高空台进气控制系统压力在整个工作范围内的精确控制问题，提出了一种基于高空台进气系统压力的PI增益调度控制设计方法，基于管道热流动力学理论提出了一种变比热的管道容腔建模方法，相对于定比热建模方法能够减少建模存在的不确定性问题。在考虑变比热的管道容腔、调节阀流量特性、液压伺服动态、传感器增益等对进气系统造成的建模不确定性的基础上，建立了完整、准确的高空台进气系统模型；在进气系统工作范围内采用24个稳态点小偏差范围内设计的最优PI控制器作为大范围过渡态工作的基底进行控制增益调度。数字仿真表明，采用这一方法一致性好，性能明显地优于传统PI控制方法；半物理仿真进一步验证了本文提出设计方法的有效性，稳态误差不大于0.1%。

Abstract:

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%.