变结构控制及其对弹性飞行器紊流减载的应用

On Improvement of Output Feedback Variable Structure Control for Gust Load Alleviation of Elastic Vehicle

研究了输出反馈变结构控制在弹性飞行器对大气紊流减载问题的应用．提出了输出反馈变结构控制系统滑动超平面的特征空间结构设计方法和具有鲁棒特性的变结构控制律．实例计算表明：该控制方法用于弹性飞行器对大气紊流减载是可行的．

The development of theory of Variable structure systems (VSS) has been slow. Heck et al in1989[3] proposed method of output feedback variable structure control (OFVSC), but appeared tostop short of stipulating the conditions under which his method could be applied. In this paper theauthors present their research results on the conditions that should be stipulated, such as: positionsand numbers of sensors / actuators, the existcnce condition, and the degree of freedom of slidingmode, etc. The stipulation of such conditions is fully discussed in the paper. Keeping these stipulatedconditions in mind, the authors propose the design method of eigenstructure assignment technique ofswitching surfaces of output feedback variable structure control system. The authors' design methodis applyed to gust load alleviation of elastic vehicle, and the authors derive eq.(27) as a variable structure control law that possesses strong robustness.Finally, numerical data of an actual elastic vehicle arc taken as example and numeriCal resultsindicate that gust load alleviation is attainable with the authors'design method.