Non-conservative soft variable structure controls with inverse-polynomial selection strategies

摘要

The paper presents necessary and sufficient conditions for the existence of a stabilizing soft variable structure control with inverse-polynomial selection strategies for single-input linear systems with input saturation. The resulting control law is then optimized by maximizing a Lyapunov-Function-based lower bound of the convergence rate. The maximal convergence control is shown to be of bang-bang type, with a simple parameter-dependent switching scheme. To overcome possible difficulties of a switching controller, a saturating high-gain control with a suboptimal convergence rate, which approximates the bang-bang control, is also presented.