Performance improvement of active suspension system using mixed H/sub 2//H/sub /spl infin// technique

In this paper, a mixed H/sub 2//H/sub /spl infin// controller is designed for 1/4 car suspension model. Neither H/sub 2/ nor H/sub /spl infin// controllers can provide goals of active suspension separately (i.e. minimizing body vertical acceleration considering restriction on suspension displacement). So, in this paper both objectives are considered in a mixed H/sub 2//H/sub /spl infin// problem. The Riccati equations are solved using a recursive algorithm and the mixed H/sub 2//H/sub /spl infin// controller performance is compared with H/sub 2/ and H/sub /spl infin// controllers through frequency and time domain simulations.