基于增益调度的航空发动机分散鲁棒控制

Gain scheduling based decentralized robust control for aircraft engines

针对航空发动机全包线大范围非线性变化动态特性下的跟踪控制问题,设计分散鲁棒跟踪控制器。引入动态响应指数收敛参数,使得控制器在保证系统稳定的同时跟踪误差收敛速率可调。在飞行包线内选择一系列设计点,以油门杆角度(PLA)表征发动机功率水平,每隔5°选取一个PLA作为一个设计功率水平,针对从一个设计功率水平过渡到另一个设计功率水平的设计阶跃过程,采用递进法设计分散鲁棒跟踪控制器。采用线性插值的方法调度非设计阶跃过程分散鲁棒跟踪控制器参数。针对某型涡扇发动机部件级模型进行仿真,仿真结果验证了控制方法的有效性。

Considering the aircraft engine full envelope tracking control under the nonlinear variation dynamic feature within wide range,the decentralized robust tracking controller is proposed. In order to ensure system stability and at the same time make the convergent rates of tracking errors adjustable,the dynamic response exponential convergent parameter is introduced. A set of operating points in the full envelope are chosen,and the aircraft engine power level is denoted by power lever angle（ PLA）. For every 5°,a PLA is chosen as a design power level. A design step process is described by a process in which the aircraft engine transfers from initial design power level to another design power level. Considering every design step process,a decentralized robust tracking controller was designed based on ＂stepping method＂. The parameters of decentralized robust tracking controller in off-design step process were scheduled by linear interpolation. A simulation was conducted on component-level model of a certain type of turbofan engine. The results validate the effectiveness of the control method.