基于模型跟随直接自适应控制的大型民机故障控制重构设计

Model-Following Direct Adaptive Control Based Reconfigurable Control Design for Failures of a Jumbo Jet Transport Aircraft

针对大型民机操纵面故障问题,提出模型跟随直接自适应重构控制算法.该算法克服了离线设计控制律的局限及间接自适应控制的不足,当操纵面发生故障时,能够在线及时更新飞行重构控制律,保证良好的飞行品质.考虑到大型民机飞行模态以线性控制为主,首先建立了状态空间下的被控对象模型、参考模型及故障模型,在此基础上设计了重构控制器,然后运用李亚普诺夫稳定性理论导出了控制器中增益阵的更新律,并证明了所设计的闭环重构系统是渐近稳定的.最后,考虑B747-100/200飞机在巡航阶段的横侧向运动,进行方向舵故障模式下的控制重构仿真,结果表明,模型跟随直接自适应控制对操纵面故障有很好的自适应调节能力,且具有良好的飞行品质.

A model following direct adaptive reconflgurable control method is proposed for the control surface faults of a jumbo jet transport aircraft. This method not only can overcome the shortcomings of non-adaption for off-line reconfigurable control method, but also can on-board update the flight control law to guarantee good flight qualities when part of the control effectors are failed. Considering the linear motion characteristics of flight mode for the jumbo jet transport aircraft, the plant model, reference model and the actuator fault model are established in state space. And then an adaptive reconfignrable controller is designed based on dynamics model. Meanwhile the asymptotical stability of the closed-loop reconfigurable control system is guaranteed by using Lyapunov theory. Simulations of the flight control system in lateral motion during cruise of the B747-100/200 aircraft are selected to illustrate the effectiveness of the design approach. Simulation results show that the proposed approach has good capability of adaptive reconfiguration and control for the flight control System with perfect flight qualities when the control surfaces fail.