Basing on lifting technology, this paper researches a design method for multirate sampled-data control system in the background of flight control system design, which consummates the theory of multirate sampled-date control system design for further steps, and provides a method to design multirate sampled-data controller. As the reason of uncertainty in the aircraft model and the need of different sampling frequencies in different control loops, Hinfinity-optimal multirate sampled-data control is considered. First, multirate sampled-data control system is outlined, and then the signal description are presented. Because of multirate sampled-data system is time-variant, the direct digital controller design becomes difficult. The equivalent discrete time-invariant systems can be converted from the linear time-variant systems through lifting technology. Then the Hinfinity discretization of multirate sampled-data systems is researched. After the sampled-data control system was lifted, the equivalent L2(0, h)-induced norm is proven. Base on the above, the method of Hinfinity-optimal multirate sampled-data control is summarized. A height control is simulated using a simplified aircraft model to illustrate the design. The simulation shows that the multirate Sampled-data control system can achieve the satisfactory objective accurately and optimally.
Optimal Multirate Flight Control Design in Multirate Sampled-data Control System
2009
6 Seiten, 13 Quellen
Conference paper
English
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