Robust H-infinity preview control of an active suspension system with norm-bounded uncertainties

Abstract

A robust H infinity preview control is investigated for an active suspension system with look-ahead sensors. The uncertain is described by a state-space model with linear nominal parts and additional nonlinear time-varying norm-bounded uncertainities. Proof of robust stability and a feedback-type robust H-infinity preview controller are derived by augmenting the dynamics of the original system and previewed road input. As, however, the augmented previewed road input gives the system a much larger dimension than the original system, much more computation time is required for solving of Riccani equations. To resolve this problem, a decomposed robust H-infinity preview controller is proposed. Robust stability and performance variations for system uncertainities are shown using a numerical example of a quarter-car model.