A dynamic model of active suspension system based on the tire traversing over irregularity using MATLAB and ADAMS MSC

Masoud Gharibkhani, Habib Mohammadzadeh


An efficient suspension system design is of great importance in automotive industry and research community while it is very crucial for ride comfort and vehicle handling. A dynamic field of studying interest is also the road irregularity effect on the suspension parameters. In the present study, a 2 DOF model has been adopted to evaluate the effect of road irregularities (harmonic and random road inputs) on ride comfort (i.e. sprung mass acceleration and deflection) in two systems of open-looped and closed-loop. It is also noteworthy that for the models with active or passive dampers, the value of the equivalent suspension damping coefficient is a function of the relative velocity of the sprung mass with respect to the wheel subsystem. The study was carried out using MATLAB software to solve the mathematical developed model and ADAMS MSC simulation was used to further enrich the reliability of the results. The results showed that the ride comfort is improved by means of the reduction of the body acceleration caused by the car body when road disturbances from smooth road and real road roughness. It was finally concluded that the active suspension design drastically reduced the body acceleration (sprung mass acceleration) and deflection within both MATLAB and ADAMS software and that road input characteristics significantly affect the ride comfort. 

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