航空发动机模糊滑模变结构控制研究

Study on fuzzy sliding mode variable structure control for aeroengine

针对航空发动机是一个具有时变不确定性的非线性系统,结合模糊控制和滑模变结构控制的特点,提出了一种基于模糊滑模变结构控制的航空发动机控制方法。采用线性滑模面和指数趋近律设计变结构控制器,应用模糊逻辑系统自适应调节切换增益,避免了传统滑模变结构控制系统在到达阶段对不确定性的敏感性,消除了滑模控制中的抖振。通过数字仿真,结果表明所设计的模糊滑模变结构控制器对系统的参数摄动和外部干扰具有不变性,使被控系统在整个控制阶段都具有较强的鲁棒性。

A method of fuzzy sliding mode variable structure control was put forward for aeroengines with time-varying uncertainty and strong nonlinearity. The method integrated fuzzy logic systeminto sliding mode variable structure control. By designing a sliding mode variable structure control system by use of linear sliding mode plane and exponential nearness rate, and adjusting switch gain with fuzzy logic system, the fuzzy sliding mode variable structure model controller overcame the sensitivity of traditional variable structure control on uncertainty in the coming process. Furthermore, the designed controller eliminated the chattering phenomena. Through digital simulation, the results show that the designed controllercan overcome parameter perturbation and exterior disturbance, that plant has strong robustness in the whole control process.