非线性挠性结构的输出反馈变结构控制

摘要

Since the modes of flexible structures are immeasurable, the variable structure controller with output information only is presented. The nonlinear part and the imprecision part caused by mede truncation are taken as the unknown portion of the model. Multi-switching surfaces were adopted for switching from one to another. First, reaching one sliding manifold with shorter reaching time and sliding on it for some time, then reaching another sliding manifold to speed up convergence. At last, the simulations using concrete satellite model imply that the method provides a good result%针对在挠性空间结构中挠性模态不可测的特点，仅利用输出信息设计变结构控制器.把模态截断所引起的模型不精确以及非线性部分均当作模型的未知部分.采用了多个滑动平面切换的方式，先以较小的趋近时间到达一个滑动平面，在该平面上滑动一段时间，再趋向于另一个平面，以加快收敛速度.最后，具体卫星模型的仿真结果表明，该方法具有很好的控制效果.