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针对具有网络时延的航空发动机分布式控制系统,提出了一种基于鲁棒H_∞理论的控制方法。首先建立航空发动机分布式控制系统(DCS)结构模型,将航空发动机控制系统划分成转速控制系统和压比控制系统两个子系统,并在此基础上分别建立其闭环系统的增广模型;并以转速控制系统为例,采用文献[6]中的网络控制方法,利用线性矩阵不等式理论给出闭环系统H_∞控制器的设计方法,设计系统的H_∞控制器实现对系统存在网络时延的补偿控制。仿真结果表明该控制方法能够克服时延对转速控制系统的影响,实现对转速设定值的稳定跟踪。
Aiming at aeroengine distributed control system with network delay, a control method based on robust H_∞ theory is proposed. Firstly, the structure model of aeroengine distributed control system (DCS) is established. The aeroengine control system is divided into two subsystems, ie speed control system and pressure ratio control system. On this basis, the augmented model of the closed-loop system is established respectively. Speed control system is taken as an example, the design method of H_∞controller in closed-loop system is given by using the network control method in [6] and the linear matrix inequality theory. The H_∞controller of the system is designed to compensate the network delay control. The simulation results show that the control method can overcome the influence of delay on the speed control system and realize the stable tracking of the speed setpoint.