This paper investigates the GENSIS air spring suspension system equivalence to a passive suspension system. The SIMULINK\nsimulation together with the OptiY optimization is used to obtain the air spring suspension model equivalent to passive suspension\nsystem, where the car body response difference from both systems with the same road profile inputs is used as the objective function\nfor optimization (OptiY program). The parameters of air spring system such as initial pressure, volume of bag, length of surge pipe,\ndiameter of surge pipe, and volume of reservoir are obtained from optimization. The simulation results show that the air spring\nsuspension equivalent system can produce responses very close to the passive suspension system.
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