Wang Xingjian, Liao Rui, Shi Cun, Wang Shaoping
School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China.
Sensors (Basel). 2017 Oct 25;17(11):2444. doi: 10.3390/s17112444.
Moving towards the more electric aircraft (MEA), a hybrid actuator configuration provides an opportunity to introduce electromechanical actuator (EMA) into primary flight control. In the hybrid actuation system (HAS), an electro-hydraulic servo actuator (EHSA) and an EMA operate on the same control surface. In order to solve force fighting problem in HAS, this paper proposes a novel linear extended state observer (LESO)-based motion synchronization control method. To cope with the problem of unavailability of the state signals required by the motion synchronization controller, LESO is designed for EHSA and EMA to observe the state variables. Based on the observed states of LESO, motion synchronization controllers could enable EHSA and EMA to simultaneously track the desired motion trajectories. Additionally, nonlinearities, uncertainties and unknown disturbances as well as the coupling term between EHSA and EMA can be estimated and compensated by using the extended state of the proposed LESO. Finally, comparative simulation results indicate that the proposed LESO-based motion synchronization controller could reduce significant force fighting between EHSA and EMA.
在迈向全电飞机（MEA）的进程中，混合驱动配置为将电动机械执行器（EMA）引入主飞行控制提供了契机。在混合驱动系统（HAS）中，电动液压伺服执行器（EHSA）和EMA在同一控制面上运行。为了解决HAS中的力对抗问题，本文提出了一种基于新型线性扩展状态观测器（LESO）的运动同步控制方法。为应对运动同步控制器所需状态信号不可用的问题，为EHSA和EMA设计了LESO以观测状态变量。基于LESO观测到的状态，运动同步控制器可使EHSA和EMA同时跟踪期望的运动轨迹。此外，利用所提出的LESO的扩展状态，可以估计和补偿非线性、不确定性、未知干扰以及EHSA和EMA之间的耦合项。最后，对比仿真结果表明，所提出的基于LESO的运动同步控制器可显著减少EHSA和EMA之间的力对抗。
