涡扇发动机自适应加减速控制研究

针对涡扇发动机加减速过程特性参数变化大的不确定系统,提出一种带执行机构的涡扇发动机自适应加减速伺服控制设计方法。采用变阻尼修正的自适应控制规律,抑制了自适应加减速过程中的参数漂移。在自适应加减速控制算法中,设计目标是使被控对象的输出能够伺服跟踪任意加减速指令信号,这一指令与涡扇发动机加减速过程中对带有条件限制的指令要求一致,为使控制系统具有加减速伺服跟踪和对外界扰动信号抑制的能力,在控制回路中内嵌积分环节,实现闭环加速伺服跟踪鲁棒性能,结果表明:自适应控制适用于涡扇发动机过渡态控制。在仿真时,在系统中加入白噪声干扰的情况下,自适应参数被限制在±0.003的范围内,没有出现参数漂移现象;在快速加减速过程中,加减速燃油流量未出现大幅超调和下垂,加减速时间不超过4 s。

Research on Adaptive Acceleration and Deceleration Control of Turbofan Engine

Aiming at the uncertain system of turbofan engine with large variation of characteristic parameters in acceleration and decel?eration process,a design method of adaptive acceleration and deceleration servo control for turbofan engine with actuator was proposed.The adaptive control law of variable damping correction was adopted to restrain the parameter drift in the process of adaptive acceleration and deceleration.In the adaptive acceleration and deceleration control algorithm,the design goal was that the output of the controlled ob?ject could servo track any command signal,which was consistent with the requirements of conditional commands in the acceleration and de?celeration process of turbofan engine.In order to make the control system have the ability of acceleration and deceleration servo tracking and external disturbance signal suppression,an integrator was embedded in the control loop to realize closed-loop acceleration and deceler?ation servo tracking.The results show that the adaptive control is suitable for the transient control of turbofan engine.In the simulation,the adaptive parameters are limited in the range of±0.003 when white noise interference is added into the system,and there is no parameter drift phenomenon.In the process of rapid acceleration and deceleration,the acceleration and deceleration fuel flow does not appear large overshoot and droop and the acceleration and deceleration time is not more than 4 s.