Abstract: On the basis of the theory of analysis mechanics, and combining with the real condition of the occupant, vehicle and road, the 12th degrees of freedom vibration model of the vehicle-occupant-road are formulated by using the equations of motions. A program is developed to create and analyze the non-linear dynamical different equations automatically, avoiding the complex manual deduction. Through the numerical analysis, the response of the system to some kinds of vibrations are also simulated, and the vibration behavior of the occupant and vehicle are studied. The result for illustrating the comfort of human body under vibrating vehicle, and improving the vibration behavior of vehicle and road have guiding significance.

Key words: Modeling, Occupant, Vehicle, Vibration behavior