APPLICATION OF DIFFERENT CONTROL APPROACHES TO THE DESIGN OF SEMI-ACTIVE SUSPENSTION SYSTEMS

Design of modern car suspension systems with contradictory limitations on ride comfort and handling is a challenging task. In this paper, Application of different control methods and effect of combining these methods on semi-active suspension systems are examined. Considering a quarter car model, semi-active suspension with Optimal Controller, Fuzzy Controller and Adaptive Optimal Fuzzy Controller (AOFC) is analyzed. Due to the limitation of design methods for non-linear systems, the design of the suspension is done on the base of linear multivariable model. Results of different control approaches are compared. Findings indicate Adaptive Optimal Fuzzy Control leads to smooth ride with optimal amplitude and acceleration transformation, while keeping the holding force at minimum variation.