| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系 === 81 === In control system design, it is often required that the system
behavior is insensitive to the parameter variations and
external disturbances. To this problem, variable structure
system control (VSSC) theory has been developed to deal with
this predicament. The theory of variable structure for
continuous system has been successfully developed and applied
to various control system. It is well known that it possesses
the characteristics of fast response and insensitivities to
changes in the system parameters or external disturbances when
in the sliding mode. However, the corresponding theory of
variable structure for discrete system has not yet been
developed completed. It should be noted that all of the works
accomplished to date has concentrated upon modifying the
control configuration to ensure the sliding motion for the
nominal system. However, if there exist uncertainties in the
system, the design procedure used in nominal system dose not
guarantee stability. Hence, the emphasis of recent researches
then focus on ensuring the occurrence of the sliding motion for
the uncertain system. However, the work has not yet been
successful. In his dissertation, the pseudo-sliding control law
is obtained which guarantees the occurrence and the stability
of the pseudo- sliding motion using only a state feedback gain.
The performance and the robustness of the proposed control
system has also been discussed. Since the derived control law
is simply a constant feedback gain, it is obvious that the
phenomenon of chattering can be reduced, and the system can be
analyzed and designed more systematically.
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