Control

Sliding Mode Control

Sliding mode control is a nonlinear, variable-structure control technique that drives the system state onto a designed sliding surface in finite time and keeps it there with a discontinuous switching control law. Once on the surface, the closed-loop dynamics are governed by the surface definition and are insensitive to matched disturbances and model uncertainty. Its main drawback is chattering — high-frequency switching that excites unmodeled dynamics — mitigated by boundary layers and higher-order sliding modes.

Why it matters for physical AI

Strong robustness to model error with modest computation keeps sliding mode control relevant for underwater vehicles, quadrotors, and manipulators whose dynamics are poorly identified.