This paper presents the simulation of two dimension a half-vehicle self –tuning active suspension
system to simultaneously improve vehicle ride comfort. A validated 4-DOF of vehicle linear model
was used to study the performance of passive suspension system and compared with the developed
active suspension system. The governing equations of motion for the self- tuning active suspension
was derived and used to reduce the effect of disturbances to the dynamics performance of the
vehicle, which appear when the vehicle excited by a semi-circular sinusoidal bump road of a (0.1
m) height. The performance of passive suspension and the self-tuning active suspension are
demonstrated by simulations and specially the vertical acceleration and the vertical root mean
square (RMS) acceleration to observe the effect of the proposed system to the ride comfort. The
active suspension system introduced in this work show good results for improving the ride comfort