In this note, a robustness issue of control laws designed by the input-shaping methodology is brought to the fore. A control law designed by this methodology consists of a sequence of step inputs that are applied at designated time instants by a switching mechanism. It is shown that the stability of systems controlled by such control laws may not be robust in the presence of errors in the switching time instants.

Issue Section:
Technical Briefs
Keywords:
control engineering, control system synthesis, robust control, time-varying systems
Topics:
Control systems, Feedback, Robustness, Stability, Uncertainty, Control engineering
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 by American Society of Mechanical Engineers
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