基于鲁棒跟踪控制的飞控系统自适应重构技术研究

Design of a Robust Adaptive Reconfigurable Flight Control System Using Multiple Controllers

应用多模型自适应控制技术可以有效地抑制作动器故障引起的参数大范围跳变。基于多模型自适应控制思想,提出了一种基于鲁棒跟踪控制的飞控系统作动器故障重构设计方法。首先建立作动器故障参数模型;然后根据故障的随机性,设计一系列并行的辨识模型,每个模型对应一种故障,同时对应于每个辨识模型建立一个控制器;最后根据飞行品质的要求,设计鲁棒跟踪控制器,由于控制器采用了积分项,可很好地抑制扰动。用该方法对某型飞机纵向控制系统进行仿真,结果表明在升降舵严重受损的情况下,飞机仍能保持良好的性能。

Aim. Boskovic et al dealt with the same problem in their paper but, in our opinion, their design of the multiple controllers used was too simple and thus inadequate. We, in this paper, dwell on the proper design of these controllers. When actuator failures occur, sharp jumps of parameters cannot be handled by ordinary design. We, in this paper, have to adopt special design techniques using multi-models. In the full paper, we explain our special design in detail; in this abstract, we just add some pertinent remarks to listing the three topics of explanation. （1）the description of problem, （2）multi-model adaptive reconfigurable techniques, and （3） the design of robust tracking controllers; in topic 2, we give Fig. 1 in the full paper which outlines our special design strategy; the two subtopics of topic 2 are the establishment of multi-models and switch conditions （subtopic 2.1） and the analysis of stability（subtopic 2.2）; in subtopic 2.2, based on the book written by Wang et al, we explain how all the controllers can have dynamic performances that are very similar in topic 3, we point out that eq. （12） in the full paper ensures that the controllers designed have satisfactory tracking control performance. Finally we took the longitudinal motion of a certain aircraft as example and performed simulations, whose results are given in Figs. 2, 3, and 4 in the full paper. These results show preliminarily that our special design strategy does ensure that the aircraft in our example have good performance in the presence of control surface failures.