The method alters the dynamics of a nonlinear system by application of a high-frequency switching control.
The 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.
The strengths of SMC include: The weaknesses of SMC include: However, the evolution of VSC is an active area of research.