Design of Reduced-Order Controllers via H∞ and Parametric Optimization: Comparison for an Active Suspension System

The design of reduced-order controllers under specific performance and structure requirements is dealt in this contribution. Two controllers are designed and compared. The first one was designed using H∞ theory whereas the latter one is designed departing from a parametric-optimization via a two-stage algorithm. The time spent by the designer using our second approach is largely reduced. An active suspension system is selected as a case study. The performance of both controllers is tested experimentally in the active suspension set-up. The experimental results show that the parametricoptimization controller practically meets the desired performance specifications. Meanwhile, the H∞ controller cannot accomplish the imposed constraints just in the low-frequency range.