基于增量动态逆的大型民用飞机容错控制策略

作动器故障是大型民用飞机飞行安全中面临的重要难题,为此,提出一种增量动态逆的容错控制方法,来解决飞行控制系统故障模式下的安全飞行控制问题.首先建立大型民用飞机非线性动力学模型及执行器故障模型;其次,根据非线性动态逆理论,提出增量形式的动态逆算法,并针对执行器故障模式,设计相应的容错控制器,增量动态逆控制引入加速度信号反馈,降低了控制律对于模型的敏感度,提高了闭环系统的鲁棒性.针对姿态回路跟踪,设计了增量动态逆姿态控制器.最后,以某型民用飞机为对象,开展了执行器故障模式下姿态角跟踪控制仿真.仿真结果显示,增量动态逆控制律在大型民用飞机的容错控制策略方案中克服了模型的不确定性,且可以达到较好的控制效果.

Research On Fault Tolerant Strategy For A Large Civil Aircraft Based On Incremental Nonlinear Dynamic Inversion

In order to solve the nonlinear prat of the flight control system, the completed nonlinear aircraft mo del was established.After that, the incremental nonlinear dynamic inversion method was introduced in order to solve the actuator faults generated during the flight process.Using the acceleration signal to obtain the real-time aerodynamic state, the required rudder surface deflection can be calculated.Taking the established nonlinear simulation model as an example, the simulation was performed and compared with the linear adaptive control method.The results shows that the controller has better performance on decreasing the model uncertainties,and it also has better response towards the control signal tracking after an actuator fault occurs.