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This paper studies the characteristic modeling problem for a class of single input single output (SISO) nonlinear systems with a relative degree of two. Firstly, to deal with the complexities of high-order nonlinear systems, we provide a class of low order and slowly time-varying linear systems to represent the original systems. Secondly, based on the characteristic model, we propose a linear controller...
This paper proposes an effective control method aimed at the linear system with time-varying delay. We address the problem by means of switching among a finite family of candidate controllers. Our control method is based on semi-discretization method and hysteresis-based switching algorithms, where the former is introduced to design the candidate controller under one fixed time delay and the latter...
This paper proposes a robust nonlinear attitude control method for aircraft based on partitioned backstepping and input-to-state stability theory. With this strategy the coupling of the model attitude can be dealt naturally. A stable attitude control is realized semi-globally and the scheme has a good robust property subjected to external disturbances. The control design can be applied directly to...
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