2ND-GENERATION APPROACHES TO ACTIVE AND SEMIACTIVE SUSPENSION CONTROL-SYSTEM DESIGN

A number of ''second generation' suspension controller design methods are reviewed in the context of a simple quarter-car model. The methods involve robustness and performance criteria not addressed in simple ' first generation'' designs, such as sky-hook damping or LQG optimal co ntrol. Three such approaches are considered in detail; these are nonli near optimal control, control with road-surface preview, and H(infinit y) optimal control. Potential advantages of these systems are demonstr ated in a uniform framework, by comparing performance with that of a r eference LQG controller, over a range of operating conditions.