Abstract:
Among the varieties of control algorithms, Variable Structure Control (VSC) or Sliding Mode Control (SMC) is
known for its most distinguished feature and ability to result in ultra-robust control systems with respect to
parametric uncertainties of structures. In this paper, control methods based on Variable Structure Control (VSC)
are presented and applied to a seismically excited civil engineering structure equipped with shape memory alloy
actuators. Design of the sliding modes including the eventual sliding mode, was accomplished by using LQR
methods. In developing control algorithms, both Lyapunov direct method and reaching law methods were used,
which result in four control laws. A comparison of these control laws assisted in further understanding of
Sliding Mode Control theory. Simulations were conducted to evaluate the level of vibration reduction using the
presented control methods.
