涡扇发动机液压机械稳态控制器的通用设计方法

General Design Method of Turbofan Engine Hydromechanical Steady State Controller

考虑到电磁干扰对涡扇发动机全权限数字电子控制FADEC系统造成的危害性,从FADEC系统备份液压机械式控制系统需求出发,基于闭环控制回路传递函数法对指定输入、输出的线性定常系统内部固有特性描述的模块化设计思想,并依据多输入单输出线性系统迭加原理的不变性,提出了一种涡扇发动机液压机械稳态控制器的通用设计方法。采用变积分增益的PI控制结构,将闭环控制回路中的稳态控制器按传递函数的输入输出关系进行隔离,提取了以转速误差为输入、以执行机构燃油流量指令为输出的可分离控制器模块,实现了涡扇发动机液压机械稳态控制器的通用化设计。

Considering the harmfulness of electromagnetic interference(EMI)on the full authority digital electronic control FADEC system of turbofan engine and aiming to address the demands of backup hydraulic mechanical control system of FADEC,a general design method of turbofan engine hydro mechanical steady-state controller was proposed,which was based on the modular design ideas of the closed-loop control loop transfer function to describe the internal characteristics of the linear constant system with specified input and output,and based on the invariance of superposition principle of multiple-input single-output linear system.The PI control structure with variable integral gain was adopted to isolate the steady-state controller in the closed-loop control loop according to the input-output relationship of the transfer function.The separable controller module with the rotor speed error as the input and the fuel flow command of the actuator as the output was extracted to realize the universal design of the hydro mechanical steady-state controller for turbofan engines.