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This study proposes a dynamic plant model to simulate the performance of a heavy equipment vehicle seat system. The system controls the transmission of vibration using a phase adjustment control method. First, a dynamic model for the flexible heavy equipment seat is proposed using a commercial multi-body dynamic analysis tool, ADAMS. This model is used as a plant model. Then a phase adjustment control mechanism for reducing the vibration and shock transmitted by the seat is applied to the driving dynamics control plant model. Angle control using the phase adjustment control was confirmed. This technique is expected to be the basis for a future commercial system.