| Summary: | 碩士 === 國立中央大學 === 電機工程研究所 === 83 === In this thesis, the asymptotical stability region of un-
certain systems with nonlinear controllers are mainly conce-
rned. In chapter 2, we estimated the attractive region of unc-
ertain systems with nonlinear optimal regulators. The objec-
tive of this chapter is to find a new sector condition which is
dependent on the uncertainty. Furthermore, we estimate t- he
the satbility region of uncertain system with a nonlinear
optimal regulators. In chapter 3, we considered the stability
problem of the variable structure systems with bounded
controller. In prev- ious works concerned, it is necessary for
them to use the s- tate transformation to make the problem
easier. Here we pro- vide a direct method to estimate the ASR.
It should be noted that the state transformation is no longer
used. In chapter 4, we considered the uncertain systems under
control constraint set. Here we adopt the control law which is
linear inside a cylinder set and saturated elsewhere. So the
control is continuous. We also transfer the robust prob- lem
into the optimal problem to estimate the stability regi- on of
the uncertain system with saturating controllers.
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