What is it about?
The synthesis of externally positive filters that can be used to modulate control signals of output-feedback sliding mode controllers is presented.
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Why is it important?
These filters are useful to estimate the norm of unmeasured signals in systems with parametric uncertainties. These norm observers are a robust alternative to state observers, that may be difficult to design for uncertain systems. It is important to design norm observers that are not too conservative, because the modulation signals should be kept small in order to reduce the amplitude of the control signals, power losses, and undesirable chattering effects that may occur in sliding-mode control.
Perspectives
These filters can be used in output-feedback sliding mode controllers as well as in other nonlinear controllers devised for the stabilization of uncertain systems.
Professor José Paulo Vilela Soares Cunha
Universidade do Estado do Rio de Janeiro
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This page is a summary of: Positive filter synthesis for sliding-mode control, IET Control Theory and Applications, August 2018, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/iet-cta.2018.5293.
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