| Summary: | 碩士 === 中原大學 === 土木工程研究所 === 83 === The object of this research is to investigate the effects of
time delay on the control of a bridge structural system in
which the fuzzy sliding mode control (FSMC) theory is used. The
phase Shift method is applied to compensate for the phases lag
due to time delay, and the two-level criterion of fuzzy control
is proposed to reduce thechattering phenomenon caused by time
delay, in order to obtain a control system which can converge
rapidly and remain stable. The results of the numerical
simulation show that the FSMC method can be applied to control
a bridge structural system effectively.The difficulty in
control due to time delay is improved by the phase shift method
for compensation. The two- level criterion functions not only
to increase the speed of the convergence of the control system,
but also to reduce the back-and-forth around the equilibrium
point in the on-off control system and avoid the waste of
energy. The numerical results also show that regardless of
whether the system has damping and regardless of the initial
displacement, by using the control method proposed in this
study when the delay time is less than 0.10 sec, the maximum
and average displacements of the system can be reduced at least
50%, and the increase in displacement and the phenomenon of
instability due to time delaycan be reduced to ensure the
dynamic stability of the control system.
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