Variable structure control: Difference between revisions

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'''Variable structure control''' ('''VSC)''') is a form of [[Classification of discontinuities|discontinuous]] [[nonlinear control]]. The method alters the [[dynamic system|dynamics]] of a [[nonlinear system]] by application of a high-frequency ''switching control''. The [[state space (controls)|state]]-[[feedback]] control law is ''not'' a [[continuous function]] of time; it ''switches'' from one smooth condition to another. So the ''structure'' of the control law ''varies'' based on the position of the state trajectory; the method switches from one smooth control law to another and possibly very fast speeds (e.g., for a [[countably infinite]] number of times in a finite time interval). VSC and associated sliding mode behaviour was first investigated in early 1950s in the Soviet Union by Emelyanov and several coresearchers.<ref name="E1967">{{Cite book|title= Variable Structure Control Systems|editor1-last=Emelyanov|editor1-first=S.V.|publisher=Nauka|___location=Moscow|year=1967|postscript= <!--None-->}}</ref>

The main mode of VSC operation is [[sliding mode control]] (SMC). The strengths of SMC include:

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== See also ==

*[[Variable structure system]]

*[[Sliding mode control]]

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*[[Pulse density modulation]]&nbsp;&ndash; A generalized form of delta-sigma modulation.

*[[Pulse-width modulation]]&nbsp;&ndash; Another modulation scheme that produces continuous motion through discontinuous switching.

== References ==

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== Further reading ==

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== References ==

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{{DEFAULTSORT:Variable Structure Control}}

[[Category:Nonlinear control]]

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